RU238339U1 - Belt grinding machine - Google Patents

Abstract

This utility model relates to the processing of materials by cutting and can be used in grinding materials with belt grinding machines. The machine comprises a frame connected to a base, a system of rollers providing movement of an abrasive belt, a spring or gas lift, and a tension lever. An adjustable lever is mounted on the same axis as the tension lever and can be locked in a predetermined position relative to the machine frame for the installed abrasive belt by means of a locking mechanism. An eye is provided at the end of the adjustable lever for attaching the second end of the spring or gas lift. The technical result enables the installation of abrasive belts of different lengths on a single machine. 2 cl., 5 fig., 1 pr.

Description

The utility model relates to metalworking and can be used for sharpening, grinding, trimming, preparing for painting, cleaning rust and removing paint from rod and tubular products, chopping and cutting tools made of various materials, such as metal, wood, ceramics, glass, plastic, polymers, and composite materials.

Belt grinders are used for both roughing and finishing machining. The machine can process parts of any shape, including rectangular, round, and irregularly shaped parts.

There are many belt grinders available with various abrasive belt tensioning and adjustment mechanisms. The most common option is a spring, while others include a furniture gas strut or ratchet mechanism. The belt tensioning system is used to remove and install the belt on the machine, as well as to ensure stable belt movement and prevent it from slipping off the rollers. The better this system is designed, the more effectively it will perform these tasks.

To adjust belt grinding machines to accommodate different abrasive belt lengths, several technical solutions are necessary. First and foremost, the machine must be equipped with a tensioning system and a retractable guide (bolt) to accommodate changes in belt length.

When designing a traditional belt grinder, specialists must consider all of these aspects to ensure its versatility and efficiency when working with abrasive belts of varying lengths.

The length of the abrasive belt affects the operating time and heat generated. A longer belt has a larger surface area, allowing it to operate longer without overheating. A longer belt also ensures more even load distribution, resulting in a more stable grinding process.

A belt grinding machine known from the prior art (https://cdn.vseinstrumenti.ru/instruction/nomenclaturecontent/202207/13502907.pdf/923612_other.pdf) is the VRK-2100/230, manufactured by PROMA Marinery LLC (PROMAMachinerys.r.o.) in the Czech Republic. Its tensioning system consists of a tension lever and a centering screw.

The disadvantage is the lack of possibility to install tapes of different lengths.

The prototype is a universal belt grinding machine (patent RU 2555290 C1, published 10.07.2015), comprising a motor plate connecting the base and a housing made of a square tube, on which a working plate is placed with the ability to attach a working tool and an adjustable stop table to it, as well as an electric motor with a drive pulley and a lever with a tension unit and a device for adjusting the position of the abrasive belt, wherein the abrasive belt is pulled through the drive pulley of the electric motor, the device for adjusting the position of the abrasive belt of the lever and the working tool, and between the housing and the lever with the tension unit and the device for adjusting the position of the abrasive belt, a gas spring is placed with the ability to attach one end to the housing and the other to the aforementioned lever. The size of the working belt is selected both by the stroke of the spring and by adjustment holes on the side surface of the housing.

The disadvantage of this invention is the narrow range of adjustment of the tension lever position and, as a consequence, the narrow range of tapes that can be used, as well as the increased time required to reconfigure the machine for different tape lengths.

Machines that handle multiple belt lengths over a wider range are known, but unlike the proposed technical solution, they rely on a retractable guide (crossbar). The crossbar system for adjusting belt length is complex and metal-intensive.

The technical result of the utility model is to provide

the ability to use a wide range of abrasive belt lengths on a single machine.

The technical result is achieved by the fact that in a belt grinding machine containing a frame connected to a base, a system of rollers with the help of which the abrasive belt moves, a spring or gas lift, a tension lever,

An additional adjustable lever is installed on the same axis as the tension lever, with the ability to lock it in the required position for the installed tape relative to the machine frame using a locking mechanism; at the end of the adjustable lever there is an eye for attaching the second end of the spring or gas lift.

The utility model is based on the principle of adjusting a belt grinding machine to accommodate abrasive belts of varying lengths by varying the attachment point of the second end of a spring or gas lift (depending on what is used on the machine to tension the belt). This allows the lever itself to be positioned, thereby allowing belts of varying lengths to be installed on the machine. This principle can be implemented in various ways, for example:

1. The adjustable lever has eight holes drilled around the bore diameter. A hole of the same diameter as the eight holes in the adjustable lever is drilled in the frame at equal distances from the center of the bore diameter. To lock the lever in the desired position for a specific length of tape, simply insert the locking pin into both the hole in the frame and one of the eight holes in the adjustable lever.

2. The adjustable lever is fixed using a ratchet mechanism mounted on the adjustable lever and a locking pawl mounted on the machine frame and locking the adjustable lever in the desired position relative to the machine frame.

The utility model provides simple and ergonomic adjustment of the tape length, while reducing the inter-operational intervals for installing a specific tape and/or the required equipment.

Allows you to do away with the bolt system for adjusting the tape length, which is more complex and metal-intensive.

The utility model is illustrated by the following drawings:

Fig. 1 - assembled belt grinding machine;

Fig. 2 - An example of fixing an adjustable lever relative to the machine frame with a locking pin in the position required for installing a 1250 mm long tape;

Fig. 3 - Example of fixing the adjustable lever with a locking pin in the position required for installing a tape 915 mm long;

Fig. 4 - An example of fixing the adjustable lever with a pawl in the position required for installing a tape 915 mm long;

Fig. 5 - An example of fixing the adjustable lever with a pawl in the position required for installing a tape 1250 mm long,

where the following positions are indicated:

1 - machine bed,

2 - base,

3 - tension lever,

4 - adjustable lever,

5 - lever axis,

6 - locking holes,

7 - locking pin,

8 - ratchet mechanism,

9 - dog,

10 - spring,

11 - abrasive belt,

12 - rollers

13 - eye

The belt grinding machine consists of a frame 1 secured to a base 2, a tension lever 3 secured in the central portion of the frame 1, and an adjustable lever 4, which is coaxial with the tension lever 3 and connected to it by a spring 10. The adjustable lever 4 is capable of being locked in the desired position relative to the frame 1 of the machine for the belt being installed. An eye 13 is provided at the end of the adjustable lever for attaching the second end of the spring 10 (or gas lift). The mechanism for locking the adjustable lever 4 in the desired position relative to the frame 1 of the machine can be implemented in various versions.

For example, in the adjustable lever 4, 8 locking holes 6 are drilled around the landing diameter. In the frame 1, at an equal distance from the center of the landing diameter, a locking hole 6 is formed of the same diameter as the diameter of the 8 locking holes 6 in the adjustable lever 4. In order to fix the lever in the desired position for a tape of a certain length, it is sufficient to install the locking pin 7 simultaneously in the locking hole 6 in the frame 1 and in one of the eight locking holes 6 of the adjustable lever 4.

Or, for example, the fixation of the adjustable lever 4 is carried out by means of a ratchet mechanism 8, made on the adjustable lever 4, and a locking pawl 9, installed on the machine frame 1 and fixing the adjustable lever in the desired position relative to the machine frame.

The roller system 12 (drive, driven, and adjusting) is located inside the abrasive belt 11, meaning the abrasive belt fits over all rollers. This allows the belt to move easily over the rollers, prevents the rollers from wearing out under the action of the abrasive on the abrasive belt, and prevents further wear on the abrasive belt itself.

Replacement, tensioning and adjustment of the abrasive belt is carried out as follows.

An abrasive belt of the required size and grain size is attached to a system of rollers and secured with a tensioning mechanism.

To attach the abrasive belt to the rollers, adjust and lock the adjustable and tension levers to the desired belt length. Press the tension lever. The spring will tighten, the adjustment roller will lower, and the belt will slide easily onto the rollers. Removing the abrasive belt from the machine is also accomplished by pressing the tension lever.

An example of the implementation of a utility model.

The tests were carried out on a KGB-1250 belt grinding machine (manufacturer: Prominstrument LLC)

In addition to the tension lever, the machine is equipped with an additional adjustable lever. One end of the lever has an eye for attaching the other end of the spring. The other end of the lever is mounted on the same axis as the tension lever. The levers move simultaneously because they are connected by a spring.

The adjustable lever is fixed using a ratchet mechanism mounted on the adjustable lever and a locking pawl mounted on the machine frame, which fixes the adjustable lever in the required position relative to the machine frame (Fig. 4, 5), namely for installing the required size of the abrasive belt.

We set the tension lever in the lower position to install a 915 mm belt; if we raise the lever and fix it in the upper position, it becomes possible to install an abrasive belt 1250 mm long.

Intermediate positions of the tension lever allow the installation of various additional equipment on the machine.

Thus, the implementation of the utility model solves the problems set by the authors.

Claims (3)

1. A belt grinding machine comprising a frame, a system of rollers providing movement of an abrasive belt, a spring or gas lift and a tension lever, characterized in that it is equipped with an adjustable lever mounted on the same axis as the tension lever and connected to it via a spring or gas lift with the possibility of fixing its position relative to the frame, changed together with the tension lever, by means of a locking mechanism for the adjustable lever. 2. A belt grinding machine according to paragraph 1, characterized in that the mechanism for fixing the adjustable lever is made in the form of eight locking holes made around its landing diameter, the same locking hole made in the frame at an equal distance from the center of the landing diameter, and a locking pin. 3. A belt grinding machine according to paragraph 1, characterized in that the mechanism for locking the adjustable lever contains a ratchet mechanism made on the adjustable lever and a locking pawl mounted on the machine frame.