High-precision plane electric grinding tool in narrow closed space

Abstract

The invention discloses a high-precision plane electric grinding tool in a narrow closed space, and belongs to the technical field of machining. The grinding device comprises a flat plate, a base, a sliding block, a motor base, a gear motor, a grinding disc, a long bolt, a supporting base, a spring a, a spring b, a supporting bottom plate, a short bolt and a pressure spring, the flat plate and the base are fixedly connected up and down through a positioning screw and a screw, and one side of the flat plate is flush with one side of the base; a motor base is arranged on the other side of the base, and the side of the base is in sliding connection with the back of the motor base; a gear motor with a downward driving end is mounted in the motor base, a grinding disc is mounted at the driving end of the gear motor through a screw, and the section of the grinding disc is in a convex shape; a pressure spring is sleeved on the body of the gear motor, and two ends of the pressure spring respectively abut against the top of the motor base bottom plate and the bottom of the flat plate. The electric grinding tool suitable for a narrow closed space structure is adopted for plane grinding, and the size, planeness and surface roughness of the plane are guaranteed.

Description

Technical Field

[0001] The present invention relates to a high-precision planar electric grinding tool in a narrow and enclosed space, belonging to the technical field of machining. Background Art

[0002] During the use of a certain artillery part, interchangeability is required, and the fit clearance is not greater than 0.01 mm. The assembly position dimension of this part is 85.9 + 0.01 mm in height and 104 mm in width (see attachment Figure 13 ), and the distance from the assembly plane position to the end face exceeds 109 mm. Due to the narrow and deep space, machine tools or common electric tools cannot grind and process it, thus affecting the processing efficiency and quality. Summary of the Invention

[0003] In order to overcome the deficiencies of the prior art, the present invention provides a high-precision planar electric grinding tool in a narrow and enclosed space. This device effectively solves the problem of fine machining of flatness and high-precision flat surfaces in narrow spaces. An electric grinding tool adapted to the structure of a narrow and enclosed space is used for planar grinding, thereby ensuring the size, flatness, and surface roughness of the plane.

[0004] The technical solution adopted by the present invention to solve its technical problems is: a high-precision planar electric grinding tool in a narrow and enclosed space, including a flat plate, a base, a slider, a motor base, a reduction motor, a grinding disc, a long bolt, a support base, spring a, spring b, a support bottom plate, a short bolt, and a compression spring. The flat plate and the base are fixedly connected up and down by screws, and one side of the flat plate is flush with one side of the base; on the other side of the base, there is a motor base, and this side of the base is slidably connected to the back of the motor base; a reduction motor with a downward driving end is installed in the motor base, and a grinding disc is installed at the driving end of the reduction motor by screws. The cross-section of the grinding disc is in a "convex" shape; a pressure spring is sleeved on the body of the reduction motor, and both ends of the pressure spring respectively abut against the top of the bottom plate of the motor base and the bottom of the flat plate.

[0005] On the side where the flat plate is flush with the base, the top end of a short bolt with an upward end in the vertical direction is threadedly connected to the flat plate, and a support bottom plate is provided at the end of the short bolt. The end of the short bolt is placed in the support bottom plate. Between the support bottom plate and the flat plate, the rod body of the short bolt passes through spring b in cooperation, and both ends of spring b respectively abut against the top of the support bottom plate and the bottom of the flat plate.

[0006] On this side of the back of the motor base, there are two vertically cylindrical inner cavities in the base. A long bolt is arranged in each inner cavity. The top end of the long bolt is threadedly connected to the base. A support base is jointly arranged at the ends of the two long bolts, and the ends of the two long bolts are both placed in the support base. A spring a is installed in each inner cavity, and the rod body of the long bolt passes through the spring a in a matching manner. The two ends of the spring a respectively abut against the top of the support base and the position below the top of the inner cavity.

[0007] Further, a horizontal dovetail groove is arranged on one side of the base close to the motor base. On the side adjacent to the dovetail groove, a slider with a dovetail-shaped block is arranged on the back of the motor base. Two vertically arranged pressing plates are arranged on both sides of the front of the motor base. The pressing 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] Further, an adjusting shim is installed in a matching manner between the dovetail-shaped block of the slider and the upper end inside the dovetail groove.

[0009] Further, a dovetail groove cover plate is fixedly connected to both sides of the dovetail groove. On the side close to the short bolt, a horizontal pull rod is fixed to the side of the slider.

[0010] Further, the driving end of the reduction motor is located at an eccentric position on the end face of the reduction motor.

[0011] Further, the support bottom plate is a square groove body with an opening facing downwards, and the support base is a rectangular groove body with an opening facing downwards.

[0012] Further, a vertically arranged positioning screw is threadedly connected to the top of the flat plate.

[0013] The beneficial effects of the present invention are as follows: The present invention effectively solves the problem of fine machining of flatness and flat surfaces with high dimensional accuracy in narrow spaces. An electric grinding tool adapted to the structure of narrow enclosed spaces is used for surface grinding, thereby ensuring the size, flatness and surface roughness of the flat surface, reducing the labor intensity of surface grinding, and having very good practicability and economy. Brief Description of the Drawings

[0014] The present invention will be further described below in conjunction with the drawings and specific embodiments.

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

[0016] Figure 2 is Figure 1 the schematic view in the A-A direction of

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

[0018] Figure 4Yes Figure 3 C-C direction schematic diagram

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

[0020] Figure 6 Yes Figure 5 B-B direction schematic diagram

[0021] Figure 7 Yes Figure 5 D-D direction schematic diagram

[0022] Figure 8 It is the sectional schematic diagram of the motor base of the present invention

[0023] Figure 9 It is the top view of the motor base of the present invention

[0024] Figure 10 It is the schematic diagram of the reduction motor of the present invention

[0025] Figure 11 It is the sectional schematic diagram of the grinding disc of the present invention

[0026] Figure 12 Yes Figure 11 K-direction schematic diagram

[0027] Figure 13 It is the structure diagram of the dimensional space of the part assembly

[0028] Reference numerals in the figure 1. Flat plate, 2. Base, 201. Dovetail groove, 202. Inner cavity, 3. Positioning screw, 4. Adjusting shim, 5. Slide block, 6. Motor base, 7. Reduction 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. Pull rod, 16. Support bottom plate, 17. Short bolt, 18. Pressure spring, 19. Machined surface Specific implementation mode

[0029] Such as Figure 1As shown in Figures 1 - 13, a high-precision planar electric grinding tool in a narrow enclosed space includes a flat 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, a spring a11, a spring b13, a support bottom plate 16, a short bolt 17, and a pressure spring 18. The flat plate 1 and the base 2 are fixedly connected up and down by screws, and one side of the flat plate 1 is flush with one side of the base 2. A positioning screw 3 in the vertical direction is threadedly connected to the top of the flat plate 1; on the other side of the base 2, there is a motor base 6, and on the side of the base 2 close to the motor base 6, there is a dovetail groove 201 in the horizontal direction; on the side adjacent to the dovetail groove 201, on the back of the motor base 6, there is a slider 5 with a dovetail-shaped block; on both sides of the front of the motor base 6, there are two vertical pressure plates 12. The pressure plates 12, the motor base 6, and the slider 5 are fixedly connected by screws. The dovetail-shaped block of the slider 5 is slidably installed in the dovetail groove 201 of the base 2, and an adjusting shim 4 is installed between the dovetail-shaped block of the slider 5 and the upper end inside the dovetail groove 201; in the motor base 6, there is a reduction motor 7 with its driving end facing downwards, and the driving end of the reduction motor 7 is at an eccentric position on the end face of the reduction motor 7; the driving end of the reduction motor 7 is installed with a grinding disc 8 by screws, and the cross-section of the grinding disc 8 is in the shape of a "convex"; a pressure spring 18 is sleeved on the body of the reduction motor 7, and both ends of the pressure spring 18 respectively abut against the top of the bottom plate of the motor base 6 and the bottom of the flat plate 1.

[0030] On the side where the flat plate 1 is flush with the base 2, the top of the short bolt 17 with its vertical end facing upwards is threadedly connected to the flat plate 1. The end of the short bolt 17 is provided with a support bottom plate 16. The support bottom plate 16 is a square groove with an opening facing downwards. The end of the short bolt 17 is placed in the support bottom plate 16. Between the support bottom plate 16 and the flat plate 1, the rod body of the short bolt 17 passes through the spring b13 in cooperation, and both ends of the spring b13 respectively abut against the top of the support bottom plate 16 and the bottom of the flat plate 1.

[0031] On the back side of the motor base 6, in the base 2, there are two vertical cylindrical inner cavities 202. In both inner cavities 202, there is a long bolt 9. The top of the long bolt 9 is threadedly connected to the base 2. The ends of the two long bolts 9 are jointly provided with a support base 10. The support base 10 is a rectangular groove with an opening facing downwards. The ends of the two long bolts 9 are both placed in the support base 10; in both inner cavities 202, there is a spring a11. The rod body of the long bolt 9 passes through the spring a11 in cooperation, and both ends of the spring a11 respectively abut against the top of the support base 10 and the position below the top of the inner cavity 202.

[0032] On both sides of the dovetail groove 201, there is a dovetail groove cover plate 14 fixedly connected. On the side close to 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 by the flat plate 1 and the positioning screw 3. The grinding disc 8 is driven by a reduction motor 7 for surface grinding. The dovetail-shaped block of the slider 5 is driven by pulling the pull rod 15 to move in the dovetail groove 201, so that the grinding position can be adjusted. The upper plane of the flat plate 1 is attached to the upper part of the plane of the part assembly space, and a certain proportion of the fitting area is ensured. Threaded holes for installing the positioning screw 3 and counterbored threaded holes for the installation reference are designed in the upper plane of the flat plate 1. For ensuring the use, heat treatment is carried out to increase the hardness.

[0034] The main function of the base 2 is to connect the slider 5 and support the whole electric grinding tool. To ensure the movement stability of the slider 5, the part cooperating with the slider 5 is designed into a dovetail groove structure. Two cylindrical inner cavities 202 with a diameter of φ18mm are designed inside the base 2 for installing the spring a11. The spring a11 is used to fix the whole electric grinding tool in the space of the plane to be machined; according to the design structure, the diameter of the spring a11 that needs to support is 16mm, and the spring aspect ratio b = H0 / D, b = 80÷16 = 5. According to the requirement of the spring stability checking formula b≤5.3, the spring a11 has good stability. The main function of the two supporting springs a11 is to overcome the gravity of the tool and press the flat plate 1 tightly against the reference surface. Through experiments, it can be manually compressed during installation and can provide reliable support for the tooling, and the pressure is selected to be 3 - 5kg.

[0035] The grinding disc 8 is made of cast iron. Considering the width of the machined surface and the structure of the electric grinding tool comprehensively, the diameter is designed to be φ40mm. Grooves are provided on the lower plane of the grinding disc 8. During the grinding process, grinding powder is contained in the grooves to ensure the grinding effect.

[0036] According to experience, the best grinding speed for the part processing material is 20 - 30m / min, and the diameter of the grinding disc 8 is φ40mm. Through calculation, the required rotational speed of the motor is: 159.2 - 238.9 r / min. Finally, a reduction motor 7 with a rotational speed of 200r / min is selected. Through grinding tests, the machining motor torque is not less than 7kg.cm, and the height dimension of the machining space is 85.9mm. After removing the thickness of the flat plate 1, finally, the total height of the motor + reducer is selected to be 68.5mm, and the torque is 7.2kg.cm. The reduction motor 7 is a 24V DC power supply. To adapt to the factory use, a 220V~24V DC transformer and speed regulator are selected.

[0037] The pressure spring 18 has a diameter of 42mm, and the spring aspect ratio b = 70÷42 = 1.67. According to the requirement of the spring stability checking formula b≤5.3, the spring has very good stability. Since the pressure spring 18 has special dimensions and standard parts cannot be selected, it is redesigned. Through grinding experiments, the pressure is 1kg.

[0038] During operation, first apply the abrasive powder onto the grinding disc 8, compress each spring, and insert the electric grinding tool into the grinding space. The flat plate 1 is tightly attached to the upper plane inside the space through three elastic supports. The positioning screw 3 is placed in the groove of φ13 on the upper plane to achieve positioning in the horizontal direction. The grinding disc 8 is pressed against the surface to be machined 19 by the compression spring 18. Use the speed regulator to control the speed at the lowest level. After turning on the power, gradually increase the speed for surface grinding. If the surface to be ground is relatively long, then pull the pull rod 15 to drive the slider 5 to move along the direction of the dovetail groove 201, so that the slider 5 drives the grinding disc 8 to perform reciprocating motion. The grinding disc 8 rotates while moving linearly along the plane, thereby achieving surface grinding and the machining effect of grinding.

Claims

1. A high-precision planar electric grinding tool in a narrow enclosed space, characterized in that: It includes a flat 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), a spring a (11), a spring b (13), a support bottom plate (16), a short bolt (17) and a pressure spring (18). The flat plate (1) and the base (2) are fixedly connected up and down by screws, and one side of the flat plate (1) is flush with one side of the base (2); on the other side of the base (2), there is a motor base (6), and this side of the base (2) is slidably connected to the back of the motor base (6); a reduction motor (7) with its driving end facing down is installed in the motor base (6), and a grinding disc (8) is installed at the driving end of the reduction motor (7) by screws, and the cross-section of the grinding disc (8) is in a "convex" shape; a pressure spring (18) is sleeved on the body of the reduction motor (7), and the two ends of the pressure spring (18) respectively abut against the top of the bottom plate of the motor base (6) and the bottom of the flat plate (1). On the side where the flat plate (1) is flush with the base (2), the top end of a short bolt (17) with its vertical end facing up is threadedly connected to the flat plate (1), and a support bottom plate (16) is provided at the end of the short bolt (17). The end of the short bolt (17) is placed in the support bottom plate (16). Between the support bottom plate (16) and the flat plate (1), the rod body of the short bolt (17) cooperatively passes through the spring b (13), and the two ends of the spring b (13) respectively abut against the top of the support bottom plate (16) and the bottom of the flat plate (1). On this side of the back of the motor base (6), two vertical cylindrical inner cavities (202) are provided in the base (2). A long bolt (9) is provided in each of the two inner cavities (202). The top end of the long bolt (9) is threadedly connected to the base (2), and a support base (10) is jointly provided at the ends of the two long bolts (9). The ends of the two long bolts (9) are both placed in the support base (10); a spring a (11) is installed in each of the inner cavities (202), and the rod body of the long bolt (9) cooperatively passes through the spring a (11), and the two ends of the spring a (11) respectively abut against the top of the support base (10) and the position below the top of the inner cavity (202).

2. The high-precision planar electric grinding tool in a narrow enclosed space according to claim 1, wherein: A horizontal dovetail groove (201) is provided on one side of the base (2) close to 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), the motor base (6) and the slider (5) are fixed by screws, and the dovetail-shaped block of the slider (5) is slidably installed in the dovetail groove (201) of the base (2).

3. The high-precision planar electric grinding tool in a narrow enclosed space according to claim 2, wherein: An adjusting shim (4) is installed in cooperation between the dovetail-shaped block of the slider (5) and the upper end inside the dovetail groove (201).

4. A high-precision planar electric grinding tool in a narrow enclosed space according to claim 1, characterized in that: Dovetail groove covers (14) are fixedly connected to both sides of the dovetail groove (201). On the side close to the short bolt (17), a horizontal pull rod (15) is fixed to the side of the slider (5).

5. The high-precision planar electric grinding tool in a narrow enclosed space according to claim 1, wherein: The driving end of the reduction motor (7) is located at an eccentric position on the end face of the reduction motor (7).

6. The high-precision planar electric grinding tool in a narrow enclosed space according to claim 1, wherein: The support base plate (16) is a square groove body with an opening facing downward, and the support base (10) is a rectangular groove body with an opening facing downward.

7. The high-precision planar electric grinding tool in a narrow enclosed space according to claim 1, characterized in that: A positioning screw (3) in the vertical direction is threadedly connected to the top of the flat plate (1).

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