RU2812420C1 - Belt grinding device - Google Patents

Abstract

FIELD: devices for grinding.

SUBSTANCE: invention can be used for processing various surfaces by grinding, stripping, polishing, trimming, chamfering, sharpening, removing bevels and rounding. The device contains a base, a frame, a support table, a drive roller, driven rollers, a sanding belt, a support plate, a unit for tensioning and adjusting the position of the belt, and a hole for an angle grinder. The frame is made in the form of two plates connected to each other and attached to the base by means of a stand. The stand is attached to the base on one side, and attached to the frame on the other side with the ability to move it relative to the frame from a vertical to a horizontal position. The support table is attached to the frame through a crossbar into the sliding groove of the eccentric and secured with a threaded connection. The frame and/or support table contains meters.

EFFECT: ensures precise processing of workpieces without the use of additional measuring equipment, the ability to process a workpiece in two planes at once, and expands the range of surface processing positions in different directions.

11 cl, 5 dwg

Description

Field of technology to which the invention relates

The claimed invention relates to devices for household dry (waterless) grinding and is intended for processing various surfaces: grinding, stripping, polishing, trimming, chamfering, sharpening, removing bevels, rounding.

Using this device, you can remove paint, rust, and burrs from metal surfaces. The surface to be treated can be metal, wood, plastic, stone, etc.

State of the art

Many different grinding devices (belt grinders) are known, which are driven in different ways using different motors.

For example, consider the “Grinder: Belt Grinding Machine” described in detail in the Internet publication (see https://habr.com/ru/articles/565548/). The machine is based on a sanding belt, which has dimensions of 50×900-1300 mm. The belt is driven through a pulley with a diameter of 128 mm mounted on the shaft of an asynchronous motor with a power of 1.1 kW and a maximum rotation speed of 2980 rpm. Based on these data, you can calculate the maximum linear speed of the belt, which will be 1200 m/min. It is limited by a frequency converter connected to the motor.

The design of the machine is quite simple, and at the same time very rigid due to its massiveness, since it is based on a sheet 12 mm thick. It is used to make a base for an asynchronous motor, to the flange of which a plate is screwed, forming the supporting frame of the entire machine. In order to at least slightly relieve the load on the electric motor flange, the base and the supporting frame are connected to each other through a part - the rod guide. Next, the rod itself is inserted into it, at one end of which a plate is attached, which carries a part in the form of a “crescent”, as well as a guide for the mechanism for installing the work table. There are two rollers at the ends of the “crescent”, and an axis passes through the center, allowing this assembly unit to be rotated at different angles. The assembly unit, the “crescent”, also includes a guide stop for the sanding belt.

A lever with a roller for centering the sanding belt is attached to the supporting frame through an axis. This lever also plays the role of a tensioner, due to the fact that a gas lift is installed between it and the frame.

The working surfaces of the drive pulley and tension roller have a semicircular truncated profile to better hold the tape on their surface.”

Design disadvantages: there is not enough electric motor power for full operation, as well as the accuracy of processing workpieces, there are no built-in angular meters, you need to use third-party equipment, it is impossible to change the engine to another in terms of power, operating principle, since the engine flanges are all different, and the engine can only be replaced exactly the same. The disadvantage is also its weight and high cost.

A belt grinding machine is known from the utility model patent RU 217063 U1. The machine contains a frame connected to the base, an adapter secured to the frame with threaded connections and configured to be attached to the frame of an angle grinder, a support table attached to the base, rollers made in the form of a drive roller, a driven roller and a tension roller and designed to accommodate an abrasive belt, and a support plate mounted on the frame and a tension lever connected to a spring, providing tension on the abrasive belt. The frame is connected to the base with the possibility of rotation, ensuring movement of the frame from a vertical position to a horizontal one, and consists of two parts connected to each other by threaded connections with the possibility of removing one of them.

The disadvantage of the known technical solution is that there are no meters for more accurate performance of work; attaching the table to the base does not allow the use of a grinder with a support table independently when the frame and base are separated; when the distance between the support table and the support plate changes, the previously established angle of inclination of the workpiece placed on the surface is lost support table in relation to the sanding belt.

The inventive belt grinding device is intended for processing various surfaces: grinding, stripping, polishing, trimming, chamfering, sharpening, removing slopes, rounding. The abrasive material is a sanding belt with a width of 50 mm and a length from 610 mm to 1200 mm, depending on the model. The device is intended for stationary use and is attached to a table or other surface using bolts or other fasteners depending on the type of surface. A distinctive feature is the presence of a built-in angle gauge, which allows you to perform processing operations by setting the desired angle of inclination of the support table and the workpiece on the table surface, without resorting to additional measuring tools.

The objective of the invention is to create an easy-to-use belt grinding device without the use of external angular measuring instruments.

Technical result: precise processing of workpieces without the use of additional measuring equipment due to the well-thought-out design of fastening the support table and the presence of built-in meters: linear and angular meters (horizontal and vertical), the ability to process the workpiece in two planes at once, which expands the range of surface processing positions in different directions .

The inventive belt grinding device contains a base, a frame, a support table, a drive roller, driven rollers, a sanding belt, a support plate and a unit for tensioning and adjusting the position of the sanding belt, and it is designed to be used as a motor for an angle grinder attached to the frame . Unlike the known device, the frame is made in the form of two plates connected to each other and attached to the base by means of a stand, which is attached to the base on one side and attached to the frame on the other with the ability to move relative to the frame from a vertical to a horizontal position, a support table is attached to the frame through the crossbar into the sliding groove of the eccentric and fixed with a threaded connection, while the frame and/or support table contains meters.

The frame plates can be connected to each other by jumpers.

The frame gauge can be made in the form of a protractor and a locking angular position indicator showing the degree of inclination of the support table.

The frame gauge can be made in the form of an angle gauge, which is a separate element mounted on the frame using magnets or screws.

The meter on the support table can be made in the form of an engraved protractor.

The gauge on the support table can be made in the form of a removable protractor or a ruler, made with the ability to change and measure the angle of fixation of the workpiece by pressing it against the support part of the removable protractor.

The support table can be equipped with a linear meter.

The drive roller may be provided with a threaded portion for connection to the shaft of an angle grinder.

The drive roller can be barrel-shaped.

The device can be configured to install various attachments for surface treatment.

The device can be configured to control the rotation speed of the sanding belt.

The device allows it to be used for cleaning and grinding surfaces with a large area due to the ability to change the position of the frame relative to the base.

The tension roller is attached to a movable plate, which has a hinge connection with the belt tension lever, thanks to which the tension roller can change the angle relative to the original horizontal position, by changing the position of the plate relative to the tension lever. The movable plate changes its angular position due to a spring-loaded screw on the reverse side of the tension lever. The spring-loaded screw is located opposite the intersection of the diagonals of the movable plate and rests against it. When changing the seating depth of the spring-loaded screw, the angular position of the tension roller changes. By placing the screw at the intersection of the diagonals of the movable plate, uniform distribution of the load from the screw to the plate is achieved, which affects the reliability and ease of adjustment.

To change the vertical angle of the work surface relative to the sanding belt, a built-in angle gauge is used, which can be an engraved protractor and a locking angle indicator that is part of the frame. By changing the position of the locking angular position indicator, you can set and track the required vertical angle of inclination of the support table for work. Or the angular vertical meter is a separate element that is attached to the frame using magnets or screws. To change the angle of the vertical surface being processed, it is necessary to change the angle. To control and position the processing of the workpiece at a certain angle in the horizontal plane, the support table has a special recess for installing a removable protractor ruler in it.

1. Using an angle grinder (grinder) as an engine significantly reduces the cost of its production.

2. The drive roller allows the use of additional modifications for the grinding machine, such as grinding attachments, felt wheels, drill chuck, etc.

3. Angle gauges mounted on the frame allow for high-precision adjustment of the angle of the vertically processed surface.

4. The table also has an angle gauge, which allows high-precision adjustment of the angle of the horizontally processed surface.

The version of the vertical and horizontal angle meter depends on the product model range.

Brief description of drawings and graphic materials

The invention is illustrated by illustrations.

In FIG. 1 shows the device in general form for using a tape with a width of 915 mm, where:

1 - base; 2 - frame; 3 - unit for tensioning and adjusting the position of the tape; 4 - support table; 5 - driven roller; 6 - sanding belt; 7 - angle grinder (angle grinder); 8 - driving roller; 9 - angular vertical meter; 10 - support plate; 11 - protractor with linear meter, 12 - stand, 13 - tension roller; 14 - fixed angular position indicator, 15 - crossbar.

In FIG. 2-5 shows the implemented invention in the model 915 Grinder Dino device.

Carrying out the invention

The inventive device operates as follows.

The device is installed on a flat horizontal surface (Fig. 1). Base 1 has 4 holes for fixing the machine on the surface. The device is fixed using bolts, screws or other fasteners, depending on the type of surface. This device uses an angle grinder 7 as a motor, which is attached to frame 2 using a special clamp clamp; there are 2 clamps with different mounting diameters for different types of angle grinders.

The device has a locking angular position indicator, consisting of an eccentric connected to the plate and an axis, which is connected to the grinder frame 2 through a detachable threaded connection, made with an offset sliding groove and threaded fixation of the crossbar. The support table 4 is attached to the frame 2 through the crossbar 15 into the sliding groove of the eccentric and is fixed with a threaded connection. To control and position the processing of the workpiece at a certain angle in the horizontal plane, the support table 4 has a special recess for installing a removable ruler-protractor with a linear meter 11 in it. Thanks to this, it is possible to install the surface being processed at the required angle to the sanding belt 6; the required angle is set on the protractor angle, and the workpiece is pressed against the edge of the protractor with a linear meter, the guide on the table allows processing of the workpiece with reciprocating movements along the table guide.

There is a stand 12, consisting of two metal legs with jumpers between the legs, attached to the base. The upper part of the rack is fixed to the frame 2 of the grinder through a swivel or threaded connection with the possibility of rotating the frame relative to the rack from a vertical to a horizontal position.

The tension roller 13 is attached to a movable plate, which has a swivel connection with the belt tension lever, thanks to which the tension roller can change the angle relative to the original horizontal position, by changing the position of the plate relative to the tension lever through the swivel joint. The movable plate changes its angular position due to a spring-loaded screw on the reverse side of the tension lever. The spring-loaded screw is located opposite the intersection of the diagonals of the movable plate and rests against it. When changing the seating depth of the spring-loaded screw, the angular position of the tension roller changes. By placing the screw at the intersection of the diagonals of the movable plate, a uniform distribution of the load from the screw to the plate is achieved, which affects the reliability and ease of adjusting the position of the sanding belt 6.

The drive roller 8 contains a threaded part for connection with the angle grinder shaft, the mating part of the roller also contains a threaded part for connection with additional equipment for surface treatment (grinding wheels, drill chuck, round attachments for grinding, etc.). The drive roller 8 is barrel-shaped and centers the belt during operation of the equipment.

The support plate 10 is designed to firmly and firmly rest the workpiece against it during surface treatment. The support plate 10 forms a rigid grinding plane, upon which the surface is processed when supported. In addition to the support plate 10, the workpiece can be leaned against the driven roller 5 to obtain concave slopes, against the tape between the rollers, in the part where the support plate 10 is missing. This type of processing is intended for more gentle and soft processing.

After installing the angle grinder 7 and the drive roller 8, a sanding belt is installed on the device. To install and tension the tape, a unit for tensioning and adjusting the position of the tape 3 is used, which must be pulled back and, after installing the tape, returned to its original position, thereby tensioning the tape, which prevents it from slipping relative to the rollers and the workpiece. The unit for tensioning and adjusting the position of the belt 3 is also designed to adjust the position of the belt during operation; for this, it is provided with a mechanism for changing the inclination of the tension roller 13 installed on the tension unit and adjusting the position of the belt 3. When their angle of position changes, the position of the belt also changes. The angle grinder 7 installed on the device is connected to the network and using the control buttons on the angle grinder 7 the machine is started/stopped. To adjust the rotation speed of the belt, a thyristor voltage regulator is used for the corresponding power of angle grinder 7 or angle grinder 7 with built-in speed control. The workpiece to be processed is located on table 4 at a right or required angle relative to the sanding belt 6. For this, a horizontal angle meter is provided: an engraved protractor or a metal removable protractor with the ability to change and measure the angle and fix the workpiece by pressing it against the supporting part of the removable protractor, located on the table 4. To change the vertical angle of the surface being processed relative to the sanding belt 6, a built-in vertical angle meter 9 is used, which is an engraved protractor and a movable part of the frame with an arrow, which is part of the frame. By changing the position of the moving part of the frame, you can set and track the required vertical angle for work. Or an angular vertical meter is used, which is a separate element that is attached to the frame using magnets or screws. To change the angle of the vertical surface being processed, it is necessary to change the angle of the table 4 relative to the sanding belt 6, guided by the readings on the angle meter 9.

The invention is implemented in the device model 915 Grinder Dino (see photographs Fig. 2, Fig. 3, Fig. 4, Fig. 5).

Thanks to the design of the proposed device, a number of problems are solved:

1. No special measuring instruments are required for processing the workpiece in the horizontal plane. At the same time, the metal protractor allows for precise processing at an angle in a fixed position along the table guide.

2. The absence of an engine (use of an angle grinder) significantly reduces the cost of production and the cost of finished equipment.

3. The drive roller has a threaded part for fixing and installing a variety of processing attachments without additional devices or mechanisms.

4. No special measuring instruments are required for processing the workpiece in the horizontal plane.

5. Due to the fact that the support roller is attached through a crossbar to the eccentric, which is part of the fixing angular position indicator, the support table can change its distance from the sanding belt, while the removal of the table occurs along a linear path; due to this, the established value is not disturbed and will not change (specified) angular vertical position of the table, as opposed to a design in which the support table is placed on a stand. This allows you to quickly change the linear distance of the table from the sanding belt; it is used for processing workpieces at the same angle of different lengths. The table extends to create a support point for a long workpiece; if the table is not extended, the workpiece will simply fall, outweighing it, or there will be a need to control the parallelism of the long workpiece relative to the table. In addition, due to the fact that the mounting hole on the eccentric and the cross-bar are made in a circular cross-section, you can quickly change the position of the table plane from a horizontal to a vertical position and, conversely, there is no need to remove the cross-bar from the eccentric, as on other devices, where the connection of the table and frame is carried out through a square cross-section, for example this one: https://grinder-sputnik.ru/). With this design, the table can change its position not only from horizontal to vertical and vice versa, but also to any other necessary angle with fixation. This is useful when the base of the workpiece already has some angle, offset, unevenness, etc. Such displacements, irregularities, and angles are compensated by adjusting the angle of the table position on the crossbar axis, while processing can be performed at the required angle.

The combination of these features allows the workpiece to be processed in two planes at once, which expands the range of surface processing positions in different directions.

Claims (11)

1. A belt grinding device containing a base, a frame, a support table, a drive roller, driven rollers, a sanding belt, a support plate and a unit for tensioning and adjusting the position of the sanding belt, and it is designed to be used as a motor of an angle grinder, mounted to the frame, characterized in that the frame is made in the form of two plates connected to each other and attached to the base by means of a stand, which is attached to the base on one side and attached to the frame on the other with the ability to move relative to the frame from a vertical to a horizontal position, supporting the table is attached to the frame through a crossbar into the sliding groove of the eccentric and fixed with a threaded connection, while the frame and/or support table contains meters. 2. The device according to claim 1, characterized in that the frame plates are connected to each other by jumpers. 3. The device according to claim 1, characterized in that the frame gauge is made in the form of a protractor and a fixed angular position indicator showing the degree of inclination of the support table. 4. The device according to claim 1, characterized in that the frame meter is made in the form of an angular meter, which is a separate element mounted on the frame using magnets or screws. 5. The device according to claim 1, characterized in that the meter on the support table is made in the form of an engraved protractor. 6. The device according to claim 1, characterized in that the gauge on the support table is made in the form of a removable protractor or ruler, made with the ability to change and measure the angle of fixation of the workpiece by pressing it against the support part of the removable protractor. 7. The device according to claim 1, characterized in that the support table is made with a linear meter. 8. The device according to claim 1, characterized in that the drive roller is made with a threaded part for connection to the shaft of an angle grinder. 9. The device according to claim 1, characterized in that the drive roller is barrel-shaped. 10. The device according to claim 1, characterized in that it is designed with the ability to install various attachments for surface treatment. 11. The device according to claim 1, characterized in that it is designed to regulate the rotation speed of the sanding belt.