High-precision planar electric grinding tool in a narrow and closed space

Abstract

The application discloses a high-precision plane electric grinding tool in a narrow closed space and belongs to the technical field of mechanical machining. The tool comprises a flat plate, a base, a sliding block, a motor seat, a speed reducer, a grinding disc, long bolts, a supporting base, spring a, spring b, a supporting bottom plate, short bolts and a compression spring. The flat plate is fixedly connected with the base through positioning screws and screws and is flush with one side of the base. The other side of the base is provided with the motor seat, and the side of the base is slidingly connected with the back of the motor seat. The motor seat is provided with a speed reducer with a downward driving end. The driving end of the speed reducer is provided with the grinding disc through screws. The cross section of the grinding disc is in the shape of a Chinese character "Ku". The speed reducer is provided with a compression spring, and the two ends of the compression spring are respectively arranged on the top of the bottom plate of the motor seat and the bottom of the flat plate. The electric grinding tool is adopted to grind the plane, and the size, flatness and surface roughness of the plane are ensured.

Description

Technical Field

[0001] This invention relates to a high-precision planar electric grinding tool for use in confined spaces, belonging to the field of machining technology. Background Technology

[0002] A certain artillery part requires interchangeability during use, with a fitting clearance of no more than 0.01mm. The assembly dimensions of this part are: height 85.9 + 0.01mm and width 104mm (see attached figure). Figure 13 The distance between the assembly plane and the end face exceeds 109mm. Due to the limited space and deep location, neither machine tools nor commonly used power tools can grind it, which affects the processing efficiency and quality. Summary of the Invention

[0003] To overcome the shortcomings of the prior art, the present invention provides a high-precision electric grinding tool for small enclosed spaces. This device effectively solves the problem of precision machining of planes with high flatness and dimensional accuracy that cannot be processed in small spaces. It uses an electric grinding tool adapted to the structure of small enclosed spaces to perform plane grinding, thereby ensuring the size, flatness and surface roughness of the plane.

[0004] The technical solution adopted by this invention to solve its technical problem is as follows: a high-precision planar electric grinding tool for confined spaces, comprising a plate, a base, a slider, a motor base, a geared motor, a grinding disc, a long bolt, a support base, spring a, spring b, a support base plate, a short bolt, and a compression spring. The plate and the base are fixedly connected vertically by screws, and one side of the plate is flush with one side of the base. A motor base is provided on the other side of the base, and this side of the base is slidably connected to the back of the motor base. A geared motor with its drive end facing downward is installed in the motor base, and a grinding disc is installed on the drive end of the geared motor by screws. The cross-section of the grinding disc is convex. A compression spring is fitted on the body of the geared motor, and the two ends of the compression spring abut against the top of the motor base base plate and the bottom of the plate, respectively.

[0005] On the side where the plate is flush with the base, the top of a short bolt with its vertical end facing upward is threaded to the plate. A support base plate is provided at the end of the short bolt, and the end of the short bolt is placed in the support base plate. Between the support base plate and the plate, the rod of the short bolt passes through a spring b, and the two ends of the spring b abut against the top of the support base plate and the bottom of the plate, respectively.

[0006] On the back side of the motor base, there are two vertical cylindrical cavities in the base. Each cavity contains a long bolt. The top of the long bolt is threaded to the base. The ends of the two long bolts are connected to a support base, and the ends of the two long bolts are placed in the support base. Each cavity contains a spring a. The rod of the long bolt passes through the spring a. The two ends of the spring a rest against the top of the support base and below the top of the cavity, respectively.

[0007] Furthermore, a horizontal dovetail groove is provided on the side of the base near the motor base, and a slider with a dovetail-shaped block is provided on the back of the motor base on the side adjacent to the dovetail groove; two vertical pressure plates are provided on both sides of the front of the motor base, and the pressure plates are fixed to the motor base and the slider by screws, and the dovetail-shaped block of the slider is slidably installed in the dovetail groove of the base.

[0008] Furthermore, an adjusting shim is installed between the dovetail-shaped block of the slider and the upper end of the dovetail groove.

[0009] Furthermore, a dovetail groove cover plate is fixedly connected to both sides of the dovetail groove, and a horizontal tie rod is fixed to the side of the slider near the short bolt.

[0010] Furthermore, the drive end of the geared motor is located at an eccentric position on the end face of the geared motor.

[0011] Furthermore, the support base plate is a square groove with the opening facing downwards, and the support base is a rectangular groove with the opening facing downwards.

[0012] Furthermore, a vertically oriented positioning screw is threaded onto the top of the plate.

[0013] The beneficial effects of this invention are: This invention effectively solves the problem of precision machining of planes with high flatness and dimensional accuracy that cannot be processed in narrow spaces. It uses an electric grinding tool adapted to the structure of narrow and enclosed spaces for plane grinding, thereby ensuring the size, flatness and surface roughness of the plane and reducing the labor intensity of plane grinding. It has very good practicality and economy. Attached Figure Description

[0014] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0015] Figure 1 This is a schematic diagram of the structure of the present invention.

[0016] Figure 2 yes Figure 1 A-A direction diagram.

[0017] Figure 3 This is a front view of the base of the present invention.

[0018] Figure 4yes Figure 3 A schematic diagram of the C-C direction.

[0019] Figure 5 This is the front view of the slider of the present invention.

[0020] Figure 6 yes Figure 5 A schematic diagram of the B-B direction.

[0021] Figure 7 yes Figure 5 A schematic diagram of the D-D direction.

[0022] Figure 8 This is a cross-sectional schematic diagram of the motor mount of the present invention.

[0023] Figure 9 This is a top view of the motor mount of the present invention.

[0024] Figure 10 This is a schematic diagram of the geared motor of the present invention.

[0025] Figure 11 This is a cross-sectional schematic diagram of the grinding disc of the present invention.

[0026] Figure 12 yes Figure 11 A schematic diagram of the K-direction.

[0027] Figure 13 It is a structural diagram showing the spatial dimensions of the parts assembly.

[0028] Numbering on the map: 1. Flat plate, 2. Base, 201. Dovetail groove, 202. Inner cavity, 3. Positioning screw, 4. Adjusting shim, 5. Slider, 6. Motor base, 7. Gear motor, 8. Grinding disc, 9. Long bolt, 10. Support base, 11. Spring a, 12. Pressure plate, 13. Spring b, 14. Dovetail groove cover plate, 15. Tie rod, 16. Support base plate, 17. Short bolt, 18. Pressure spring, 19. Machined surface. Detailed Implementation

[0029] like Figure 1As shown in Figure 13, a high-precision planar electric grinding tool for confined spaces includes a plate 1, a base 2, a slider 5, a motor base 6, a reduction motor 7, a grinding disc 8, a long bolt 9, a support base 10, springs a11 and b13, a support base plate 16, short bolts 17, and a pressure spring 18. The plate 1 and the base 2 are fixedly connected vertically by screws. One side of the plate 1 is flush with one side of the base 2. A vertical positioning screw 3 is threaded onto the top of the plate 1. A motor base 6 is provided on the other side of the base 2. A horizontal dovetail groove 201 is provided on the side of the base 2 near the motor base 6. On the side adjacent to the dovetail groove 201, a slider with a dovetail-shaped block is provided on the back of the motor base 6. Block 5; Two vertical pressure plates 12 are provided on both sides of the front of the motor base 6. The pressure plates 12 are fixed to the motor base 6 and the slider 5 by screws. The dovetail-shaped block of the slider 5 is slidably installed in the dovetail groove 201 of the base 2. An adjusting shim 4 is installed between the dovetail-shaped block of the slider 5 and the upper end of the dovetail groove 201. A reduction motor 7 with the drive end facing down is installed in the motor base 6. The drive end of the reduction motor 7 is located at the eccentric position of the end face of the reduction motor 7. A grinding disc 8 is installed on the drive end of the reduction motor 7 by screws. The cross section of the grinding disc 8 is convex. A pressure spring 18 is sleeved on the body of the reduction motor 7. The two ends of the pressure spring 18 abut against the top of the base plate of the motor base 6 and the bottom of the plate 1, respectively.

[0030] On the side where the plate 1 is flush with the base 2, the top of the short bolt 17 with its vertical end facing upward is threaded to the plate 1. The end of the short bolt 17 is provided with a support base plate 16, which is a square groove with its opening facing downward. The end of the short bolt 17 is placed in the support base plate 16. Between the support base plate 16 and the plate 1, the rod of the short bolt 17 passes through the spring b13. The two ends of the spring b13 abut against the top of the support base plate 16 and the bottom of the plate 1, respectively.

[0031] On the back side of the motor base 6, the base 2 has two vertical cylindrical cavities 202. Each cavity 202 has a long bolt 9. The top of the long bolt 9 is threaded to the base 2. The ends of the two long bolts 9 are connected to a support base 10. The support base 10 is a rectangular groove with the opening facing downward. The ends of the two long bolts 9 are placed in the support base 10. Each cavity 202 is equipped with a spring a11. The rod of the long bolt 9 passes through the spring a11. The two ends of the spring a11 abut against the top of the support base 10 and the position below the top of the cavity 202, respectively.

[0032] A dovetail groove cover plate 14 is fixedly connected to both sides of the dovetail groove 201. On the side near the short bolt 17, a horizontal pull rod 15 is fixed to the side of the slider 5.

[0033] The electric grinding tool is positioned using a flat plate 1 and positioning screws 3. A geared motor 7 drives the grinding disc 8 for planar grinding. A pull rod 15 moves the dovetail-shaped block of the slider 5 within the dovetail groove 201, allowing adjustment of the grinding position. The upper surface of the flat plate 1 is flush with the upper surface of the part assembly space plane, ensuring a certain proportion of contact area. The upper surface of the flat plate 1 is designed with threaded holes for mounting the positioning screws 3 and countersunk threaded holes for mounting reference. To ensure usability, heat treatment is performed to improve hardness.

[0034] The main function of the base 2 is to connect the slider 5 and support the entire electric grinding tool. To ensure the stability of the slider 5's movement, the part that mates with the slider 5 is designed with a dovetail groove structure. The base 2 has two cylindrical cavities 202 with a diameter of φ18mm inside, which are used to install springs a11. Springs a11 are used to fix the entire electric grinding tool in the space of the surface to be processed. According to the design structure, the diameter of the supporting springs a11 needs to be 16mm, and the length-to-diameter ratio of the springs is b=H0 / D, b=80÷16=5. According to the spring stability verification formula b≤5.3, springs a11 have good stability. The main function of the two supporting springs a11 is to overcome the weight of the tool and keep the plate 1 tightly against the reference surface. Through experiments, it is ensured that it can be manually compressed during installation and can provide reliable support for the tooling. The pressure is selected as 3~5kg.

[0035] The grinding disc 8 is made of cast iron. Taking into account the width of the machining surface and the structure of the electric grinding tool, the diameter is designed to be φ40mm. The lower surface of the grinding disc 8 has grooves. During the grinding process, the grooves contain grinding powder to ensure the grinding effect.

[0036] Based on experience, the optimal grinding speed for the material being processed is 20–30 m / min. The grinding disc 8 has a diameter of φ40 mm. Calculations show the required motor speed is 159.2–238.9 r / min, and a geared motor 7 with a speed of 200 r / min is ultimately selected. Through grinding tests, the motor torque is found to be no less than 7 kg·cm. The processing space height is 85.9 mm. Subtracting the thickness of the plate 1, the final selected total height for the motor and reducer is 68.5 mm, with a torque of 7.2 kg·cm. The geared motor 7 uses a 24V DC power supply; to suit factory use, a 220V~24V DC transformer and speed controller are selected.

[0037] The compression spring 18 has a diameter of 42mm and a length-to-diameter ratio of b=70÷42=1.67. According to the spring stability calculation formula, b≤5.3, the spring has good stability. Due to its special size, the compression spring 18 could not be selected as a standard part and was redesigned. Through grinding experiments, the pressure was 1kg.

[0038] During operation, grinding powder is first applied to the grinding disc 8, and the springs are compressed. The electric grinding tool is then inserted into the grinding space. The flat plate 1 is held in close contact with the upper surface of the space by three elastic supports. The positioning screw 3 is fitted into the groove φ13 on the upper surface to achieve horizontal positioning. The grinding disc 8 is pressed against the workpiece surface 19 by the pressure spring 18. The speed is controlled at the lowest setting using a speed controller. After power is turned on, the speed is gradually increased for planar grinding. If the surface to be ground is long, the pull rod 15 is pulled, causing the slider 5 to move along the direction of the dovetail groove 201. The slider 5 drives the grinding disc 8 to reciprocate. The grinding disc 8 rotates while moving linearly along the plane, thus achieving planar grinding and the desired grinding effect.

Claims

1. A high-precision planar electric grinding tool for use in confined spaces, characterized in that: The system includes a flat plate (1), a base (2), a slider (5), a motor base (6), a geared motor (7), a grinding disc (8), a long bolt (9), a support base (10), a spring a (11), a spring b (13), a support base plate (16), a short bolt (17), and a pressure spring (18). The flat plate (1) and the base (2) are fixedly connected by screws. One side of the flat plate (1) is flush with one side of the base (2). A motor base (6) is provided on the other side of the base (2). This side of the base (2) is slidably connected to the back of the motor base (6). A geared motor (7) with its drive end facing down is installed in the motor base (6). A grinding disc (8) is installed on the drive end of the geared motor (7) by screws. The cross-section of the grinding disc (8) is convex. A pressure spring (18) is fitted on the body of the geared motor (7). The two ends of the pressure spring (18) abut against the top of the base plate of the motor base (6) and the bottom of the flat plate (1), respectively. On the side where the plate (1) is flush with the base (2), the top of the short bolt (17) with its vertical end facing upward is threaded to the plate (1). A support base plate (16) is provided at the end of the short bolt (17). The end of the short bolt (17) is placed in the support base plate (16). Between the support base plate (16) and the plate (1), the rod of the short bolt (17) passes through the spring b (13). The two ends of the spring b (13) abut against the top of the support base plate (16) and the bottom of the plate (1), respectively. On the back side of the motor base (6), the base (2) is provided with two vertical cylindrical cavities (202), and each of the two cavities (202) is provided with a long bolt (9). The top of the long bolt (9) is threaded to the base (2), and the ends of the two long bolts (9) are provided with a support base (10). The ends of the two long bolts (9) are placed in the support base (10). Each cavity (202) is equipped with a spring a (11). The rod of the long bolt (9) passes through the spring a (11). The two ends of the spring a (11) are respectively abutted against the top of the support base (10) and the position below the top of the cavity (202). The top of the plate (1) is threaded with a vertical positioning screw (3). A horizontal dovetail groove (201) is provided on the side of the base (2) near the motor base (6). On the side adjacent to the dovetail groove (201), a slider (5) with a dovetail-shaped block is provided on the back of the motor base (6). Two vertical pressure plates (12) are provided on both sides of the front of the motor base (6). The pressure plates (12) are fixed to the motor base (6) and the slider (5) by screws. The dovetail-shaped block of the slider (5) is slidably installed in the dovetail groove (201) of the base (2).

2. The high-precision planar electric grinding tool for use in a confined space according to claim 1, characterized in that: An adjusting shim (4) is installed between the dovetail-shaped block of the slider (5) and the upper end of the dovetail groove (201).

3. The high-precision planar electric grinding tool for use in a confined space according to claim 1, characterized in that: A dovetail cover plate (14) is fixedly connected to both sides of the dovetail groove (201). On the side near the short bolt (17), a horizontal pull rod (15) is fixed to the side of the slider (5).

4. The high-precision planar electric grinding tool for use in a confined space according to claim 1, characterized in that: The drive end of the geared motor (7) is located at the eccentric position on the end face of the geared motor (7).

5. The high-precision planar electric grinding tool for use in a confined space according to claim 1, characterized in that: The support base plate (16) is a square groove with the opening facing downwards, and the support base (10) is a rectangular groove with the opening facing downwards.

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