A self-centering clamping device

Abstract

The present invention relates to the field of clamping technology, and discloses a self-centering clamping device, comprising: a base plate; an adjusting component, which is arranged on the base plate, and comprises a conical adjusting part and an adjusting power part, wherein the conical adjusting part is arranged at the output end of the adjusting power part; at least four positioning components, which are distributed around the circumference of the conical adjusting part, and the positioning components are slidably arranged on the base plate along the radial and circumferential directions of the conical adjusting part and the length along the radial direction is adjustable, and one end of each positioning component can abut against the conical surface of the conical adjusting part, and the other end can abut against the inner wall of the workpiece to be processed; a clamping component, which is slidably arranged on the base plate. The self-centering clamping device disclosed in the present invention has a high degree of automation, and the conical adjusting part is driven to move in a direction perpendicular to the base plate by the adjusting power part, so that each positioning component can abut against the workpiece to be processed, and is suitable for different types of workpieces to be processed. The clamping component can clamp the workpiece to be processed, and the calibration time is shortened and the calibration efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of clamping, and in particular to a self-centering clamping device. Background Art

[0002] The inner gear ring parts in the planetary transmission gearbox are annular parts with a relatively regular appearance, but the parts have many different sizes and specifications. During the processing, several different specifications of fixtures are often required. Conventional fixtures include pressure plates, equal height blocks, base plates and other parts. Specifically, when the inner gear ring is processed in a vertical boring and milling machining center, the inner gear ring is first placed horizontally. Since the dividing circle or internal and external stoppers of the end surface of the vertical boring and milling machining center need to be concentric with the pitch circle of the tooth of the inner gear ring, but since there are many types of tooth specifications of the inner gear ring, including straight teeth and helical teeth, and helical teeth include helix angles, tooth pressure angles, and modules, there are also many types. To adapt to various types of inner gear rings, the pitch circle of the tooth can only be manually corrected through the pitch circle rod, and generally at least four evenly distributed points must be corrected, resulting in long installation and calibration time and low installation and calibration efficiency. Summary of the invention

[0003] Based on the above, the purpose of the present invention is to provide a self-centering clamping device to solve the problems of long calibration time and low calibration efficiency in the prior art.

[0004] To achieve the above object, the present invention adopts the following technical solutions:

[0005] A self-centering clamping device comprises: a base plate; an adjusting assembly, arranged on the base plate, comprising a conical adjusting piece and an adjusting power piece, the conical adjusting piece being arranged at the output end of the adjusting power piece, and the adjusting power piece being capable of driving the conical adjusting piece to move in a direction perpendicular to the base plate; at least three positioning assemblies, distributed around the circumference of the conical adjusting piece, the positioning assemblies being slidably arranged on the base plate along the radial and circumferential directions of the conical adjusting piece, the length of the positioning assemblies along the radial direction being adjustable, one end of each of the positioning assemblies being capable of abutting against the conical surface of the conical adjusting piece, and the other end being capable of abutting against the inner wall of a workpiece to be processed; a clamping assembly, being slidably arranged on the base plate and capable of clamping the workpiece to be processed.

[0006] As a preferred solution of a self-centering clamping device, the positioning assembly includes a contact piece, an elastic piece, a support piece, a sliding seat and a pitch ball piece connected in sequence, the sliding seat is slidably connected to the base plate, the contact piece can abut against the conical surface, and when the elastic piece is compressed, the pitch ball piece can abut against the inner wall of the workpiece to be processed.

[0007] As a preferred solution of a self-centering clamping device, the self-centering clamping device also includes a support seat, the support seat is provided with a guide groove, the guide groove extends along the circumferential direction of the conical adjusting member, and the positioning assembly can slide along the guide groove.

[0008] As a preferred solution of the self-centering clamping device, the self-centering clamping device further comprises a first guide rail, the first guide rail is slidably disposed in the guide groove, the sliding seat is slidably disposed on the first guide rail, and the first guide rail extends along the radial direction.

[0009] As a preferred embodiment of a self-centering clamping device, the support member is fixedly arranged on the segment ball member, and the self-centering clamping device also includes: a first guide seat, fixedly arranged on the first guide rail, a first mounting hole is provided on the first guide seat, the contact member is arranged through the first mounting hole, the contact member is a contact column, and the diameter of the first mounting hole is larger than the diameter of the contact column; a second guide seat, fixedly arranged on the first guide rail, the elastic member is located between the first guide seat and the second guide seat, a second mounting hole is provided on the second guide seat, the support member is arranged through the second mounting hole, the support member is a support column, and the diameter of the second mounting hole is larger than the diameter of the support column.

[0010] As a preferred embodiment of a self-centering clamping device, the self-centering clamping device includes a handwheel and a screw, the screw is threadedly connected to the clamping assembly, the handwheel is arranged at one end of the screw, and the handwheel can drive the screw to rotate so that the clamping assembly slides along the radial direction.

[0011] As a preferred embodiment of a self-centering clamping device, the number of the clamping assemblies is at least two, wherein the two clamping assemblies are arranged opposite to each other and are respectively a first clamping assembly and a second clamping assembly, the screw rod comprises a first screw rod segment and a second screw rod segment, the first thread on the first screw rod segment and the second thread on the second screw rod segment have opposite rotation directions and the first pitch of the first thread is the same as the second pitch of the second thread, the first clamping assembly is threadedly connected to the first screw rod segment, and the second clamping assembly is threadedly connected to the second screw rod segment, and when the handwheel is rotated, the first clamping assembly and the second clamping assembly can move toward or away from each other.

[0012] As a preferred solution of a self-centering clamping device, the self-centering clamping device also includes a second guide rail arranged on the base plate, the second guide rail extends along the radial direction, and the clamping assembly includes: a support block, which can be slidably arranged on the second guide rail, and the support block is used to place the workpiece to be processed; a vertical adjustment assembly, one end of the vertical adjustment assembly is arranged on the support block, and the length of the vertical adjustment assembly along its own axial direction is adjustable; a pressure plate, which is arranged at the other end of the vertical adjustment assembly, and the pressure plate is perpendicular to the axial direction of the vertical adjustment assembly; a horizontal power member, a first fixed end of the horizontal power member is arranged on the vertical adjustment assembly, and a first movable end is connected to the pressure plate, and the horizontal power member can drive the pressure plate to reciprocate along the radial direction.

[0013] As a preferred solution of a self-centering clamping device, the clamping assembly also includes a clamping power member, a second fixed end of the clamping power member is arranged on the support block, and a second movable end is connected to the vertical adjustment assembly, and the clamping power member can drive the vertical adjustment assembly and the pressure plate to move upward or downward in a direction perpendicular to the base plate so that the pressure plate can be separated from or abutted against the workpiece to be processed.

[0014] As a preferred solution of a self-centering clamping device, the number of the positioning assemblies is four, and the four positioning assemblies are evenly distributed along the circumference of the conical adjusting member; the number of the clamping assemblies is four, and the four clamping assemblies are evenly distributed along the circumference of the conical adjusting member, and each of the clamping assemblies is located between two of the positioning assemblies.

[0015] The beneficial effects of the present invention are as follows: the self-centering clamping device disclosed in the present invention has a high degree of automation. When calibrating the workpiece to be processed, the power part is adjusted to drive the conical adjusting part to move in a direction perpendicular to the base plate, so that at least three positioning components can abut against the workpiece to be processed. It can be suitable for different types of workpieces to be processed. The clamping component can clamp the workpiece to be processed, which shortens the calibration time, improves the calibration efficiency of the workpiece to be processed, and improves the processing speed of the workpiece to be processed. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments of the present invention. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the contents of the embodiments of the present invention and these drawings without paying any creative work.

[0017] Figure 1 is a schematic diagram of a self-centering clamping device provided in a specific embodiment of the present invention;

[0018] Figure 2 It is a schematic diagram of an adjustment assembly, a positioning assembly, a support seat, a first guide rail, a guide pin, a first guide seat, a second guide seat, and a mounting plate provided in a specific embodiment of the present invention;

[0019] Figure 3 It is a schematic diagram of a clamping assembly and a second guide rail provided in a specific embodiment of the present invention.

[0020] In the figure:

[0021] 1. Bottom plate;

[0022] 2. Adjustment assembly; 21. Conical adjustment member; 22. Adjustment power member;

[0023] 3. Positioning assembly; 31. Contact member; 32. Elastic member; 33. Support member; 34. Joint ball member; 35. Sliding seat;

[0024] 4. Clamping assembly; 41. Support block; 42. Vertical adjustment assembly; 43. Pressing plate; 44. Horizontal power member; 45. Pressing power member;

[0025] 511, support seat; 5110, guide groove; 512, first guide rail; 513, guide pin; 514, first guide seat; 515, second guide seat; 516, mounting plate; 52, second guide rail;

[0026] 61. Hand wheel; 62. Screw rod; 621. First screw rod section; 622. Second screw rod section. DETAILED DESCRIPTION

[0027] In order to make the technical problems solved by the present invention, the technical solutions adopted and the technical effects achieved clearer, the technical solutions of the embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0028] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance. Among them, the terms "first position" and "second position" are two different positions.

[0029] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection", "connection", and "abutment" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0030] like Figures 1 to 3 As shown, this embodiment provides a self-centering clamping device for positioning and clamping an inner gear ring, that is, the workpiece to be processed in this embodiment is an inner gear ring. The self-centering clamping device includes a base plate 1, an adjusting component 2, four positioning components 3 and a clamping component 4. The adjusting component 2 is arranged on the base plate 1, and includes a conical adjusting member 21 and an adjusting power member 22. The adjusting power member 22 is a hydraulic cylinder. The conical adjusting member 21 is arranged at the output end of the adjusting power member 22. The adjusting power member 22 can drive the conical adjusting member 21 to move in a direction perpendicular to the base plate 1. In this embodiment, the direction perpendicular to the base plate 1 is the vertical direction. The four positioning components 3 are evenly distributed around the circumference of the conical adjusting member 21. The four positioning components 3 are slidably arranged on the base plate 1 along the radial and circumferential directions of the conical adjusting member 21. The length of the positioning component 3 along the radial direction is adjustable. One end of each positioning component 3 can abut against the conical surface of the conical adjusting member 21, and the other end can abut against the inner wall of the workpiece to be processed. The clamping component 4 is slidably arranged on the base plate 1 and can clamp the workpiece to be processed. In other embodiments, the adjusting power member 22 is not limited to the hydraulic cylinder of the present embodiment, and may also be an electric push rod, a cylinder or other linear drive mechanism, which is selected according to actual needs.

[0031] It should be noted that the four positioning components 3 of this embodiment are evenly distributed along the circumference of the conical adjusting member 21, the number of the clamping components 4 is four, and the four clamping components 4 are evenly distributed along the circumference of the conical adjusting member 21, and each clamping component 4 is located between two positioning components 3. In other embodiments, the number of positioning components 3 is not limited to the four of this embodiment, but can also be three or more than four, and the number of clamping components 4 is not limited to the four of this embodiment, but can also be one, two, three or more than four, which can be set according to actual needs.

[0032] The self-centering clamping device provided in this embodiment has a high degree of automation. When calibrating the workpiece to be processed, the conical adjusting member 21 is driven to move upward or downward in the vertical direction by adjusting the power member 22, so that the four positioning components 3 can all abut against the workpiece to be processed. It can be suitable for different types of workpieces to be processed. The clamping component 4 can clamp the workpiece to be processed, which shortens the calibration time, improves the calibration efficiency of the workpiece to be processed, and improves the processing speed of the workpiece to be processed.

[0033] like Figure 2 As shown, the positioning assembly 3 of this embodiment includes a contact member 31, an elastic member 32, a support member 33, a sliding seat 35 and a joint ball member 34 connected in sequence. The sliding seat 35 is slidably connected to the bottom plate 1. The contact member 31 can abut against the conical surface, and the joint ball member 34 can abut against the inner wall of the workpiece to be processed. When the elastic member 32 is compressed, the joint ball member 34 can abut against the inner wall of the workpiece to be processed. The end of the contact member 31 of this embodiment that abuts against the conical surface is a semi-sphere. This structure can reduce the friction between the contact member 31 and the conical surface, and ensure that the contact member 31 can slide smoothly along the conical surface when the conical adjustment member 21 moves in the vertical direction. The support member 33 of this embodiment is a telescopic rod. The length of the telescopic rod can be adjusted according to actual needs, so that the positioning assembly 3 of this embodiment can position workpieces of different diameters. The telescopic rod belongs to the prior art and can be obtained by external purchase, which will not be repeated here. In other embodiments, in order to make the total length of the positioning assembly 3 suitable for workpieces of different sizes to be processed, the positioning assembly 3 matching the size of the workpiece to be processed can be replaced as a whole, and the length of the positioning assembly 3 is selected according to the size of the workpiece to be processed.

[0034] like Figure 2 As shown, the self-centering clamping device of this embodiment also includes a support seat 511, and a guide groove 5110 is provided on the support seat 511. The guide groove 5110 extends along the circumferential direction of the conical adjustment member 21. The positioning assembly 3 can slide along the guide groove 5110 so that the pitch ball member 34 can abut against the bottom of the groove of the workpiece to be processed. Figure 2 As shown, the self-centering clamping device of this embodiment also includes a first guide rail 512, a mounting plate 516 and a guide pin 513. The first guide rail 512 is fixedly arranged on the mounting plate 516. One end of the mounting plate 516 is sleeved on the conical adjusting member 21 to ensure that the mounting plate 516 can rotate with the intersection of the central axis of the conical adjusting member 21 and the mounting plate 516 as the center of the circle. The first guide rail 512 and the mounting plate 516 are slidably arranged in the guide groove 5110. The sliding seat 35 is slidably arranged on the first guide rail 512. The first guide rail 512 extends radially. One end of the guide pin 513 is fixedly arranged on the mounting plate 516, and the other end can slide along the guide groove 5110.

[0035] like Figure 2As shown, the self-centering clamping device also includes a first guide seat 514, a second guide seat 515 and a second guide rail 52. The second guide rail 52 is arranged on the bottom plate 1, and the clamping assembly 4 is slidably arranged on the second guide rail 52. The second guide rail 52 extends radially. The first guide seat 514 is fixedly arranged on the mounting plate 516, and a first mounting hole (not shown in the figure) is provided on the first guide seat 514. The contact member 31 is arranged through the first mounting hole. The contact member 31 is a contact column. The diameter of the first mounting hole is greater than the diameter of the contact column. The second guide seat 515 is fixedly arranged on the mounting plate 516. The elastic member 32 is located between the first guide seat 514 and the second guide seat 515. The second guide seat 515 is provided with a second mounting hole (not shown in the figure). The support member 33 is arranged through the second mounting hole. The support member 33 is a support column. The diameter of the second mounting hole is greater than the diameter of the support column.

[0036] Specifically, the adjusting power member 22 drives the conical adjusting member 21 to move downward in the vertical direction, and the contact member 31 squeezes the elastic member 32 radially outward. The elastic member 32 is compressed and the positioning assembly 3 moves outward along the length direction of the first guide rail 512 until the pitch ball member 34 abuts against the inner wall of the meshing tooth of the workpiece to be processed, and the pitch ball member 34 slides along the side wall of the meshing tooth toward the bottom wall of the tooth groove, and the positioning assembly 3 slides along the guide groove 5110. At this time, the contact member 31 rotates circumferentially by an angle relative to the first mounting hole, and the support member 33 rotates circumferentially by the same angle relative to the second mounting hole, and the end of the pitch ball member 34 abutting against the workpiece to be processed abuts against the bottom wall of the tooth groove of the workpiece to be processed.

[0037] The end of the pitch ball 34 that can abut against the workpiece to be processed in this embodiment is hemispherical. This structure enables the pitch ball 34 to move along the tooth wall of the workpiece to be processed to the bottom wall of the tooth groove, ensuring that the pitch ball 34 can adapt to the inner gear rings with different helical angles. Of course, in other embodiments, the end of the pitch ball that can abut against the workpiece to be processed can also be round or have other shapes with relatively smooth surfaces, which can be set according to actual needs.

[0038] like Figure 1 As shown, the self-centering clamping device of this embodiment includes a hand wheel 61 and a screw rod 62, the screw rod 62 is threadedly connected to the clamping assembly 4, the hand wheel 61 is arranged at one end of the screw rod 62, and the hand wheel 61 can drive the screw rod 62 to rotate so that the clamping assembly 4 slides along the second guide rail 52. Specifically, when the hand wheel 61 is shaken, the screw rod 62 rotates accordingly, and the rotation of the screw rod 62 can be converted into a linear motion of the clamping assembly 4 along the length direction of the second guide rail 52, so that the clamping assembly 4 slides along the second guide rail 52, thereby preliminarily moving the clamping assembly 4 to a suitable position.

[0039] The two clamping assemblies 4 of this embodiment are arranged opposite to each other and are respectively the first clamping assembly and the second clamping assembly. The screw rod 62 includes a first screw rod segment 621 and a second screw rod segment 622. The first thread on the first screw rod segment 621 and the second thread on the second screw rod segment 622 have opposite rotation directions and the first pitch of the first thread is the same as the second pitch of the second thread. The first clamping assembly is threadedly connected to the first screw rod segment 621, and the second clamping assembly is threadedly connected to the second screw rod segment 622. When the hand wheel 61 is turned, the first clamping assembly and the second clamping assembly can move toward or away from each other.

[0040] Specifically, the first thread and the second thread have opposite rotation directions, which can make the first clamping assembly and the second clamping assembly move in opposite directions, thereby ensuring that the first clamping assembly and the second clamping assembly simultaneously move toward or away from the conical adjusting member 21, thereby achieving simultaneous adjustment of the first clamping assembly and the second clamping assembly. The first pitch of the first thread is the same as the second pitch of the second thread, thereby ensuring that the first clamping assembly and the second clamping assembly move at the same speed, thereby achieving synchronous adjustment of the first clamping assembly and the second clamping assembly. Compared with the structure in which each clamping assembly 4 corresponds to a screw rod 62, the screw rod 62 structure of this embodiment is simple to operate, and the two clamping assemblies 4 can be adjusted by turning the hand wheel 61. In addition, it can also ensure that the two relatively arranged clamping assemblies 4 move the same distance.

[0041] like Figure 3 As shown, the clamping assembly 4 of this embodiment includes a support block 41, a vertical adjustment assembly 42, a pressure plate 43 and a horizontal power member 44. The horizontal power member 44 is a hydraulic cylinder. The support block 41 can be slidably set on the second guide rail 52. The support block 41 is used to place the workpiece to be processed. One end of the vertical adjustment assembly 42 is set on the support block 41. The length of the vertical adjustment assembly 42 along its own axial direction is adjustable. The pressure plate 43 is set at the other end of the vertical adjustment assembly 42. By adjusting the height of the vertical adjustment assembly 42, the distance from the pressure plate 43 to the support block 41 can be adjusted to adapt to workpieces to be processed of different heights. The first fixed end of the horizontal power member 44 is set on the vertical adjustment assembly 42, and the first movable end is connected to the pressure plate 43. The horizontal power member 44 can drive the pressure plate 43 to reciprocate radially.

[0042] Specifically, the vertical adjustment assembly 42 of this embodiment includes a fixing seat and a vertical rod, the fixing seat is provided with an internal thread, and the vertical rod is provided with an external thread that matches the internal thread, and the height of the vertical adjustment assembly 42 is changed by adjusting the length of the vertical rod screwed into the fixing seat. In other embodiments, the vertical adjustment assembly 42 can also be a hydraulic cylinder, an electric push rod, a gas cylinder or other linear drive mechanism, and the horizontal power member 44 is not limited to the hydraulic cylinder of this embodiment, and can also be an electric push rod, a gas cylinder or other linear drive mechanism, which is selected according to actual needs.

[0043] It should be noted that each clamping assembly 4 of the present embodiment includes two vertical adjustment assemblies 42, which are arranged in parallel. The two additional vertical adjustment assemblies 42 can ensure that the pressure plate 43 is always in a horizontal state. Specifically, the upper end of one of the vertical adjustment assemblies 42 is slidably connected to the bottom of the pressure plate 43, and when the horizontal power member 44 drives the pressure plate 43 to reciprocate in the radial direction, the upper end of the vertical adjustment assembly 42 is slidably connected to the pressure plate 43. A strip hole is provided on the pressure plate 43, and the upper end of the other vertical adjustment assembly 42 passes through the strip hole. When the horizontal power member 44 drives the pressure plate 43 to reciprocate in the radial direction, the output end of the vertical adjustment assembly 42 reciprocates in the strip hole relative to the pressure plate 43.

[0044] Furthermore, if Figure 3 As shown, the clamping assembly 4 of this embodiment includes a clamping power member 45, which is a hydraulic cylinder. The second fixed end of the clamping power member 45 is set on the support block 41, and the second movable end is connected to the fixed seat. The clamping power member 45 can drive the vertical adjustment assembly 42 and the pressure plate 43 to move upward or downward in the vertical direction to make the pressure plate 43 separate from or abut against the workpiece to be processed. Specifically, compared with the vertical adjustment assembly 42, the clamping power member 45 of this embodiment has higher movement accuracy, which can make the pressure plate 43 abut against the workpiece to be processed so that the pressure plate 43 presses the workpiece to be processed, and the pressure of the pressure plate 43 on the workpiece to be processed is maintained within a preset range, which not only avoids the occurrence of the phenomenon of loose clamping caused by the pressure of the pressure plate 43 on the workpiece to be processed being too small, but also avoids the occurrence of the phenomenon of the pressure of the pressure plate 43 on the workpiece to be processed being too large, causing the pressure plate 43 to damage the workpiece to be processed. In other embodiments, the clamping power member 45 is not limited to the hydraulic cylinder of the present embodiment, and may also be an electric push rod, a cylinder or other linear drive mechanism, which is selected according to actual needs.

[0045] Preferably, the self-centering clamping device of this embodiment also includes a controller (not shown in the figure), which is electrically connected to the adjusting power member 22, the horizontal power member 44 and the clamping power member 45 respectively. The controller can be a centralized or distributed controller. For example, the controller can be a single single-chip microcomputer, or it can be composed of multiple distributed single-chip microcomputers. A control program can be run in the single-chip microcomputer to control the adjusting power member 22, the horizontal power member 44 and the clamping power member 45 to realize their functions.

[0046] Furthermore, the self-centering clamping device of this embodiment also includes a hydraulic station, which is connected to the adjusting power member 22, the horizontal power member 44 and the pressing power member 45 respectively.

[0047] In the prior art, clamping the workpiece to be processed and removing the processed workpiece from the self-centering clamping device are mostly done manually, which increases the labor intensity of the operator. The clamping assembly 4 of this embodiment is equipped with a horizontal power member 44, a pressing power member 45 and a controller to achieve automatic clamping of the workpiece to be processed and detachment of the processed workpiece from the clamping assembly 4, which reduces the labor intensity of manual labor and realizes the automatic operation of the self-centering clamping device.

[0048] Specifically, the working process of the self-centering clamping device of this embodiment is as follows:

[0049] Step 1: Preliminarily adjust the position of the clamping assembly on the second guide rail 52 by means of the hand wheel 61 and the screw rod 62 according to the diameter of the workpiece to be processed;

[0050] Step 2: Adjust the height of the vertical adjustment assembly 42 so that the distance from the pressure plate 43 to the support block 41 is within a preset distance range, and at the same time adjust the length of the support member 33 so that the end of the pitch ball member 34 that can contact the workpiece to be processed reaches a preset position range. At this time, the elastic member 32 has a certain amount of compression deformation, that is, there is a certain pre-tightening force between the contact member 31 and the conical adjustment member 21;

[0051] Step 3: Place the workpiece to be processed on the support blocks 41 of the four clamping assemblies 4;

[0052] Step 4: The power member 22 is adjusted to drive the conical adjusting member 21 to move downward in the vertical direction, and the contact member 31 presses the elastic member 32 radially outward. The elastic member 32 is compressed and the positioning assembly 3 moves outward along the length direction of the first guide rail 512 until the pitch ball member 34 abuts against the inner wall of the meshing tooth of the workpiece to be processed, and the pitch ball member 34 slides along the side wall of the meshing tooth toward the bottom wall of the tooth groove, that is, the positioning assembly 3 slides along the guide groove 5110, and the end of the pitch ball member 34 abutting against the workpiece to be processed abuts against the bottom wall of the tooth groove of the workpiece to be processed;

[0053] Step 5: The horizontal power member 44 drives the pressing plate 43 to move in the horizontal direction, so that the end of the pressing plate 43 that is in contact with the workpiece to be processed moves to just above the workpiece to be processed;

[0054] Step 6: The pressing power member 45 drives the pressing plate 43 to move downward in the vertical direction, so that the pressing plate 43 presses the workpiece to be processed, and at the same time locks the adjusting power member 22, so that the position of the conical adjusting member 21 in the vertical direction remains unchanged;

[0055] Step 7: Processing the workpiece;

[0056] Step 8: After the workpiece is processed, the clamping power member 45 drives the pressing plate 43 to move upward in the vertical direction, so that the pressing plate 43 is separated from the processed workpiece;

[0057] Step nine, the horizontal power member 44 drives the pressing plate 43 to move in the horizontal direction, so that the end of the pressing plate 43 that is in contact with the workpiece to be processed can move in a direction away from the workpiece to be processed after processing;

[0058] Step 10: Unlock the adjusting power member 22, and the adjusting power member 22 drives the conical adjusting member 21 to move upward in the vertical direction. The elastic member 32 pushes the contact member 31 to abut against the conical surface of the conical adjusting member 21, and the pitch ball member 34 gradually separates from the workpiece to be processed.

[0059] Step 11: Move the processed workpiece to the next station for further processing.

[0060] Of course, in other embodiments of the present invention, the working process of the self-centering clamping device is not limited to the limitation of this embodiment, and can also be other steps, which can be adjusted according to actual needs.

[0061] Note that the above are only preferred embodiments of the present invention and the technical principles used. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in more detail through the above embodiments, the present invention is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A self-centering clamping device, characterized in that: include: Bottom plate (1); An adjustment component (2) is arranged on the bottom plate (1), comprising a conical adjustment member (21) and an adjustment power member (22), wherein the conical adjustment member (21) is arranged at an output end of the adjustment power member (22), and the adjustment power member (22) can drive the conical adjustment member (21) to move in a direction perpendicular to the bottom plate (1); At least three positioning components (3) are distributed around the circumference of the conical adjusting member (21); the positioning components (3) are slidably arranged on the bottom plate (1) along the radial direction and the circumferential direction of the conical adjusting member (21); the length of the positioning components (3) along the radial direction is adjustable; one end of each positioning component (3) can abut against the conical surface of the conical adjusting member (21), and the other end can abut against the inner wall of the workpiece to be processed; A clamping assembly (4) is slidably arranged on the base plate (1) and is capable of clamping the workpiece to be processed.

2. The self-centering clamping device according to claim 1, characterized in that: The positioning assembly (3) comprises a contact member (31), an elastic member (32), a support member (33), a sliding seat (35) and a joint ball member (34) which are connected in sequence; the sliding seat (35) is slidably connected to the base plate (1); the contact member (31) can abut against the conical surface; when the elastic member (32) is compressed, the joint ball member (34) can abut against the inner wall of the workpiece to be processed; and the support member (33) is fixedly arranged on the joint ball member (34).

3. The self-centering clamping device according to claim 2, characterized in that: The self-centering clamping device also includes a support seat (511), and a guide groove (5110) is provided on the support seat (511), and the guide groove (5110) extends along the circumferential direction of the conical adjustment member (21), and the positioning assembly (3) can slide along the guide groove (5110).

4. The self-centering clamping device according to claim 3, characterized in that: The self-centering clamping device also includes a first guide rail (512), the first guide rail (512) can be slidably arranged in the guide groove (5110), the sliding seat (35) can be slidably arranged on the first guide rail (512), and the first guide rail (512) extends along the radial direction.

5. The self-centering clamping device according to claim 4, characterized in that: The self-centering clamping device also includes: A first guide seat (514) is fixedly arranged on the first guide rail (512), a first mounting hole is arranged on the first guide seat (514), the contact member (31) passes through the first mounting hole, the contact member (31) is a contact column, and the diameter of the first mounting hole is greater than the diameter of the contact column; The second guide seat (515) is fixedly arranged on the first guide rail (512), the elastic member (32) is located between the first guide seat (514) and the second guide seat (515), the second guide seat (515) is provided with a second mounting hole, the support member (33) is arranged through the second mounting hole, the support member (33) is a support column, and the diameter of the second mounting hole is greater than the diameter of the support column.

6. The self-centering clamping device according to claim 1, characterized in that: The self-centering clamping device comprises a hand wheel (61) and a screw rod (62), wherein the screw rod (62) is threadedly connected to the clamping assembly (4), and the hand wheel (61) is arranged at one end of the screw rod (62). The hand wheel (61) can drive the screw rod (62) to rotate so that the clamping assembly (4) slides along the radial direction.

7. The self-centering clamping device according to claim 6, characterized in that: The number of the clamping assemblies (4) is at least two, wherein the two clamping assemblies (4) are arranged opposite to each other and are respectively a first clamping assembly and a second clamping assembly, the screw rod (62) comprises a first screw rod segment (621) and a second screw rod segment (622), the first thread on the first screw rod segment (621) and the second thread on the second screw rod segment (622) have opposite rotation directions and the first pitch of the first thread is the same as the second pitch of the second thread, the first clamping assembly is threadedly connected to the first screw rod segment (621), and the second clamping assembly is threadedly connected to the second screw rod segment (622), and when the hand wheel (61) is turned, the first clamping assembly and the second clamping assembly can move towards or away from each other.

8. The self-centering clamping device according to claim 1, characterized in that: The self-centering clamping device further comprises a second guide rail (52) arranged on the base plate (1), wherein the second guide rail (52) extends along the radial direction, and the clamping assembly (4) comprises: A support block (41) slidably disposed on the second guide rail (52), the support block (41) being used to place the workpiece to be processed; A vertical adjustment component (42), one end of which is arranged on the support block (41), and the length of the vertical adjustment component (42) along its own axis direction is adjustable; A pressing plate (43) is arranged at the other end of the vertical adjustment component (42), and the pressing plate (43) is perpendicular to the axial direction of the vertical adjustment component (42); A horizontal power member (44), wherein a first fixed end of the horizontal power member (44) is arranged on the vertical adjustment assembly (42), and a first movable end is connected to the pressure plate (43), and the horizontal power member (44) can drive the pressure plate (43) to reciprocate along the radial direction.

9. The self-centering clamping device according to claim 8, characterized in that: The clamping assembly (4) further comprises a clamping power member (45), a second fixed end of the clamping power member (45) being arranged on the supporting block (41), and a second movable end being connected to the vertical adjustment assembly (42), and the clamping power member (45) being capable of driving the vertical adjustment assembly (42) and the pressing plate (43) to move in a direction perpendicular to the base plate (1) so that the pressing plate (43) abuts against the workpiece to be processed.

10. The self-centering clamping device according to claim 1, characterized in that: The number of the positioning components (3) is four, and the four positioning components (3) are evenly distributed along the circumference of the conical adjusting member (21); the number of the clamping components (4) is four, and the four clamping components (4) are evenly distributed along the circumference of the conical adjusting member (21); each of the clamping components (4) is located between two of the positioning components (3).

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