fixture

Abstract

The present invention relates to the technical field of parts processing, and provides a clamp, comprising a support seat for placing a workpiece, a fixing block fixing an abutment arm to the support seat, an abutment portion of the abutment arm capable of abutting against a side wall of the workpiece, a first mounting groove and a first locking assembly being provided on the abutment portion, a first guide surface being provided in the first mounting groove, a first rotating shaft being coaxially connected to a first cam, the first cam abutting against the first abutment block to move from an idle position away from the workpiece to a locked position abutting against the workpiece, a stop portion being provided in the first mounting groove, when the abutment block is respectively in the idle position and the locked position, the abutment position of the cam and the abutment block is respectively located on both sides of the rotating shaft, and when the abutment block is in the locked position, the abutment block abuts against the stop portion along the rotation direction. In this way, when the workpiece vibrates or is impacted during processing, the stop portion limits the first cam from continuing to rotate under the action of the first abutment block, and cannot rotate in the reverse direction, thereby achieving self-locking.

Description

Technical Field

[0001] The present invention relates to the technical field of parts processing, in particular to a clamp. Background Art

[0002] Currently, a common clamping method used on CNC machine tools, grinding machines, and other applications is to use a pressure plate to hold the workpiece in place. The fixture structure consists of a fixture support, pressure plate, base, and locking screws. To use, the pressure plate is placed in the fixture slot and pressed against the top surface of the workpiece. The screws are tightened from top to bottom to hold the workpiece in place. To replace the pressure plate, the screws are loosened and the workpiece is placed in the desired position, and the process is repeated. This type of pressure plate fixture has a simple structure and a wide range of applications.

[0003] However, in actual work, it was found that the traditional pressure plate relies on the upper surface of the workpiece to press the workpiece. If the upper surface of the workpiece is also the surface to be processed, it is necessary to use a local overlapping plate and milling in multiple times. This method requires workers to repeat clamping many times, resulting in accumulated errors and affecting product quality; or the length of the blank can be increased to leave space for the overlapping plate for milling, and finally the overlapping is removed. This method has a long process flow and a long work cycle, low work efficiency and increased material costs.

[0004] Therefore, some machine tools use side top clamps, that is, the side wall of the workpiece is clamped by the clamp to completely expose the surface to be processed, avoiding processing interference or material waste.

[0005] Since the size of the side wall of the workpiece is much smaller than the size of the surface to be machined, it is difficult for the transmission clamp to clamp the peripheral side wall of the workpiece, and the clamping stability is poor.

[0006] Based on this, some existing side top clamps include a first-level top block and a second-level top block. After the first-level top block abuts against the side wall of the workpiece, the second-level top block is driven to extend from the first top block and further abut against the side wall of the workpiece. Since the contact area between the second-level top block and the workpiece is smaller than the contact area between the first-level top block and the workpiece, the side is more conducive to complete contact between the abutting surface and the side wall for clamping and fixing.

[0007] Commonly, one end of the secondary top block is an inclined surface, and one end of the control block is an inclined surface that matches it. Through the abutment of the two inclined surfaces, as the inclined surface of the control block is pressed, part of the vertical pressure is converted into a horizontal force, so that the secondary top block can extend from the primary top block. The control block is self-locking through a bolt connection, and the abutment relationship between the secondary top block and the workpiece is maintained by the abutment tube.

[0008] However, during use, it was found that when the workpiece vibrated or was impacted during processing, the control block was subjected to horizontal and vertical forces due to the abutment mode of the inclined surface. The horizontal force was used on the inclined surface, causing the two inclined surfaces to squeeze each other, and the edges gradually showed extrusion deformation, resulting in a shortening of the inclined surface stroke; while the vertical force acted on the threaded connection, making the threaded connection extremely easy to be damaged and fail, resulting in the need to frequently replace threaded parts.

[0009] Therefore, there is an urgent need for a clamp to solve the above technical problems. Summary of the Invention

[0010] The purpose of the present invention is to provide a clamp that uses a cam structure instead of a transmission method of inclined surface abutment and has a self-locking mechanism, so that the clamp can clamp the workpiece more stably.

[0011] To achieve this object, the present invention adopts the following technical solutions:

[0012] Fixture, including:

[0013] A support seat, the support seat is used to place the workpiece;

[0014] Fixed blocks, the fixed blocks are mounted on the support base, and the fixed blocks are arranged in pairs on opposite sides of the workpiece;

[0015] An abutting arm, one end of the abutting arm is connected to the fixing block, and the other end is provided with an abutting portion, the abutting portion can abut against the side wall of the workpiece, and the abutting portion is provided with a first mounting groove on a side facing the workpiece;

[0016] The first locking assembly, the first locking assembly includes a first rotating shaft and a first abutment block, the first rotating shaft passes through the abutment portion and is rotatably connected, one end of the first rotating shaft is fixed with a first cam, the first cam is located in the first mounting groove, the first mounting groove is further provided with a first guide surface, the first abutment block is slidably connected with the first guide surface, the first abutment block includes an idle position away from the workpiece and a locked position abutting the workpiece, the peripheral side wall of the first cam abuts with the first abutment block, and is used to drive the first abutment block to move along the first guide surface from the idle position to the locked position, a stop portion is provided in the first mounting groove, when the first abutment block is located in the idle position, the abutment position of the first cam and the first abutment block is located on one side of the first rotating shaft, when the first abutment block is located in the locked position, the abutment position of the first cam and the first abutment block is located on the other side of the rotating shaft, and the first cam abuts with the stop portion along the rotation direction.

[0017] As a preferred technical solution of the clamp, a rubber pad is provided on an end surface of one side of the abutting portion facing the workpiece.

[0018] As a preferred technical solution for the above-mentioned clamp, the above-mentioned first locking assembly also includes a first elastic member, which is arranged in the above-mentioned first mounting groove, and the active end of the above-mentioned first elastic member is connected to the above-mentioned first abutment block, so that the above-mentioned first abutment block has a tendency to move along the above-mentioned first guide surface away from the above-mentioned workpiece.

[0019] As a preferred technical solution of the clamp, the abutment block is cylindrical, and the circumferential side of the first cam abuts against the circumferential side of the cylinder.

[0020] As a preferred technical solution of the above-mentioned clamp, two of the above-mentioned first elastic members are fixed in the above-mentioned first installation groove, one end of the two first elastic members is fixed to the above-mentioned abutment portion, and the other end is fixed to the axial ends of the above-mentioned first abutment block.

[0021] As a preferred technical solution of the above-mentioned clamp, the above-mentioned clamp also includes a support block, which is located on the side of the above-mentioned abutment arm facing away from the above-mentioned workpiece, and one end of the above-mentioned support block is rotatably connected to the above-mentioned fixed block, and the above-mentioned abutment arm is rotatably connected to the above-mentioned fixed block. The two above-mentioned rotating shafts are parallel in direction, the above-mentioned abutment portion can be close to the side wall of the above-mentioned workpiece, and the other end of the above-mentioned support block can abut against the above-mentioned abutment arm, and the distance between the two above-mentioned rotating shafts is smaller than the distance between the two ends of the above-mentioned support block.

[0022] As a preferred technical solution of the above-mentioned clamp, the above-mentioned clamp also includes a second elastic member, which is arranged between the above-mentioned support block and the above-mentioned fixed block. The active end of the above-mentioned second elastic member is connected to the above-mentioned support block, so that one end of the above-mentioned support block has a movement tendency to abut against the above-mentioned abutment arm.

[0023] As a preferred technical solution for the above-mentioned clamp, a plurality of slots are provided on the side of the above-mentioned abutment arm facing away from the above-mentioned workpiece, one end of the above-mentioned support block is plugged into one of the plurality of slots, and the plurality of slots are distributed in sequence between the above-mentioned first rotating shaft and the above-mentioned abutment portion.

[0024] As a preferred technical solution of the above-mentioned clamp, the support seat is provided with a T-slot, the fixed block is located in the above-mentioned T-slot and is slidably connected to the above-mentioned support seat, the fixed block is provided with a second mounting slot on the side facing away from the above-mentioned workpiece and is installed with a second locking assembly, the second locking assembly includes a second rotating shaft and a second abutment block, the second rotating shaft passes through the above-mentioned fixed block and is rotatably connected, one end of the above-mentioned second rotating shaft is fixed with a second cam, the second cam is located in the above-mentioned second mounting slot, a second guide surface is also provided in the above-mentioned second mounting slot, the second abutment block is slidably connected to the above-mentioned second guide surface, the second abutment block includes an idle position and an abutment position, when in the above-mentioned abutment position, the second abutment block is away from the above-mentioned support seat, when in the abutment position, the second abutment block abuts with the bottom wall of the above-mentioned mounting slot, and the above-mentioned fixed block abuts with the limiting protrusion of the above-mentioned T-slot, and the peripheral side wall of the second cam abuts with the second abutment block, for driving the second abutment block to move along the above-mentioned second guide surface from the above-mentioned idle position to the above-mentioned locking position.

[0025] As a preferred technical solution of the above-mentioned clamp, the other end of the above-mentioned first rotating shaft and / or the second rotating shaft is connected to a handle.

[0026] Beneficial effects of the present invention:

[0027] When a workpiece needs to be fixed, the workpiece's surface to be machined faces away from the support seat, and the fixing block is installed on the support seat so that the abutment portion of the abutment arm abuts against the side wall of the workpiece. To further fix the workpiece, the first rotating shaft is twisted, and the first rotating shaft rotates with the first cam. The side wall of the first cam abuts the first abutment block and moves along the first guide surface from the idle position to the locked position. The first abutment block gradually approaches the side wall of the workpiece until it reaches the locked position, completing the abutment with the side wall of the workpiece. This design reduces the clamping area and only requires clamping on the side wall of the part, avoiding clamping on the upper surface. Compared with traditional pressure plates, it leaves more machining space, simplifies the processing process, and improves work efficiency.

[0028] Furthermore, to prevent the workpiece from vibrating or being impacted during machining, the workpiece further acts on the first abutment block with a reverse force, causing the first abutment block to move from the self-locking position to the idle position. The first abutment block then abuts against the first cam, causing the first cam to rotate and release the lock. To this end, the first locking assembly in this embodiment has a self-locking mechanism. For ease of description, in this embodiment, the first cam rotates clockwise to push the first abutment block from the idle position to the locked position.

[0029] When the first abutment block is in the idle position, the abutment position between the first cam and the first abutment block is located in the semicircular area between 0 o'clock, 3 o'clock and 6 o'clock. When the first abutment block is in the locked position, the abutment position between the first cam and the first abutment block is located in the semicircular area between 6 o'clock, 9 o'clock and 12 o'clock, and the first rotating shaft is located on a straight line passing through 0 o'clock and 6 o'clock. When the first abutment block is in the locked position, the workpiece applies a force to the first abutment block, and the first abutment block can only continue to rotate clockwise against the first cam. Since the anti-rotation portion abuts against the first cam to limit the first cam from continuing to rotate clockwise, the first cam continues to abut the first abutment block in the locked position. When it is necessary to unlock the workpiece, the first rotating shaft is rotated counterclockwise, and the abutment position between the first cam and the first abutment block returns to the semicircular area between 0 o'clock, 3 o'clock and 6 o'clock, contacting the self-locking state of the locking assembly, and the first abutment block returns to the idle position against the first cam. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] 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 describing 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 any creative work.

[0031] Figure 1 Schematic diagram of the structure of the fixture (including the workpiece) provided in an embodiment of the present invention;

[0032] Figure 2 Schematic diagram of the abutment between the fixture provided by an embodiment of the present invention and the side wall (vertical) of the workpiece;

[0033] Figure 3 Schematic diagram of the abutment between the fixture provided by an embodiment of the present invention and the side wall (inclined) of the workpiece;

[0034] Figure 4 is a structural schematic diagram of a first locking assembly provided by an embodiment of the present invention in an idle state;

[0035] Figure 5 This is a structural schematic diagram of a first locking assembly in a locked state provided by an embodiment of the present invention;

[0036] Figure 6 is a structural schematic diagram of the second locking assembly provided by an embodiment of the present invention in an idle state;

[0037] Figure 7 This is a force analysis diagram when the fixture provided by an embodiment of the present invention abuts against the side wall of the workpiece.

[0038] In the picture:

[0039] 10. Support seat; 11. T-slot; 111. Limiting protrusion;

[0040] 20. Workpiece;

[0041] 30. Fixed block; 31. Second mounting slot; 32. Second rotating shaft; 33. Second cam; 34. Second abutting block;

[0042] 40. Abutment arm; 41. Abutment portion; 411. First mounting groove; 412. Anti-rotation portion; 42. Slot;

[0043] 51. First rotating shaft; 52. First abutting block; 53. First cam; 54. First elastic member; 55. Handle;

[0044] 60. Support block. DETAILED DESCRIPTION

[0045] The present invention will be further described in detail below with reference to the accompanying drawings and examples. It will be understood that the specific embodiments described herein are intended only to illustrate the present invention and are not intended to limit the present invention. It should also be noted that, for ease of description, the accompanying drawings only illustrate portions relevant to the present invention, not all structures.

[0046] In the description of the present invention, unless otherwise expressly specified or limited, the terms "connected," "connected," and "fixed" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention in specific circumstances.

[0047] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Furthermore, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0048] In the description of this embodiment, the terms "upper," "lower," "right," and other orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely for ease of description and simplified operation. They do not indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used solely for descriptive purposes and have no special meanings.

[0049] like Figure 1-6 As shown, the present invention provides a clamp, including a support base 10, a fixed block 30, an abutting arm 40 and a first locking assembly. The support base 10 is used to place a workpiece 20; the fixed block 30 is installed on the support base 10, and the fixed blocks 30 are arranged in pairs on opposite sides of the workpiece 20; one end of the abutting arm 40 is connected to the fixed block 30, and the other end is provided with an abutting portion 41, which can abut against the side wall of the workpiece 20, and the abutting portion 41 is provided with a first mounting groove 411 on the side facing the workpiece 20; the first locking assembly includes a first rotating shaft 51, a first abutting block 52 and a first cam 53, and the first rotating shaft 51 passes through the abutting portion 41 And it is rotatably connected, a first cam 53 is fixed to one end of the first rotating shaft 51, the first cam 53 is located in the first mounting groove 411, and a first guide surface is also provided in the first mounting groove 411, the first abutment block 52 is slidably connected to the first guide surface, and the first abutment block 52 includes an idle position away from the workpiece 20 and a locking position abutting against the workpiece 20, and the circumferential side wall of the first cam 53 can abut against the first abutment block 52, for driving the first abutment block 52 to move along the first guide surface from the idle position to the locking position.

[0050] Specifically, the first guide surface is an inclined surface, one end of which is connected to the bottom wall of the first installation groove 411 , and the other end of which is connected to the end surface of the abutting portion 41 .

[0051] When it is necessary to fix the workpiece 20, the surface to be processed of the workpiece 20 is turned away from the support base 10, and the fixing block 30 is installed on the support base 10 so that the abutting portion 41 of the abutting arm 40 abuts against the side wall of the workpiece 20. In order to further fix the workpiece 20, the first rotating shaft 51 is twisted, and the first rotating shaft 51 rotates with the first cam 53. The side wall of the first cam 53 abuts the first abutting block 52 and moves along the first guide surface from the idle position to the locked position. The first abutting block 52 gradually approaches the side wall of the workpiece 20 until it reaches the locked position, completing the abutment with the side wall of the workpiece 20. This design has a small clamping area and only needs to be clamped on the side wall of the part, avoiding clamping on the upper surface. Compared with traditional pressure plates, more machining space is reserved, which simplifies the processing technology and improves work efficiency.

[0052] Furthermore, to prevent the workpiece 20 from vibrating or being impacted during machining, the workpiece 20 further acts on the first abutment block 52 with a reverse force, causing the first abutment block 52 to move from the locked position to the idle position. The first abutment block 52 then abuts against the first cam 53, causing the first cam 53 to rotate and release the lock. To this end, the first locking assembly in this embodiment has a self-locking mechanism. For ease of description, in this embodiment, the first cam 53 rotates clockwise to push the first abutment block 52 from the idle position to the locked position.

[0053] Specifically, a rotation-stopping portion 412 is provided in the first mounting groove 411. When the first abutting block 52 is in the idle position, the abutting position of the first cam 53 and the first abutting block 52 is located on one side of the first rotating shaft 51. When the first abutting block 52 is in the locked position, the abutting position of the first cam 53 and the first abutting block 52 is located on the other side of the first rotating shaft 51, and the first cam 53 abuts against the rotation-stopping portion 412 along the rotation direction. With this arrangement, when the first abutting block 52 is in the idle position, the abutting position of the first cam 53 and the first abutting block 52 is located in the semicircular area between 0 o'clock, 3 o'clock, and 6 o'clock. When the first abutting block 52 is in the locked position, the abutting position of the first cam 53 and the first abutting block 52 is located in the semicircular area between 6 o'clock, 9 o'clock, and 12 o'clock, and the first rotating shaft 51 is located on a straight line passing through 0 o'clock and 6 o'clock. When the first abutment block 52 is in the locked position, the workpiece 20 applies a force to the first abutment block 52, forcing the first abutment block 52 to continue rotating clockwise against the first cam 53. Since the anti-rotation portion 412 abuts against the first cam 53, it restricts further clockwise rotation of the first cam 53, causing the first cam 53 to continue to abut against the first abutment block 52 in the locked position. To release the workpiece 20, the first rotating shaft 51 is rotated counterclockwise, and the abutment position of the first cam 53 and the first abutment block 52 returns to the semicircular area between 0 o'clock, 3 o'clock, and 6 o'clock, returning the contact locking assembly to its self-locking state. The first abutment block 52 abuts against the first cam 53 and returns to the idle position.

[0054] Optionally, a rubber pad is provided on the end surface of the abutting portion 41 and / or the first abutting block 52 facing the workpiece 20. This arrangement forms a soft contact between the clamp and the side wall of the workpiece 20, preventing scratches or other bumps or extrusion damage to the side wall of the workpiece 20 or the abutting surface of the clamp during clamping or processing.

[0055] Optionally, the first locking assembly further includes a first elastic member 54, which is disposed in the first mounting groove 411. The active end of the first elastic member 54 is connected to the first abutting block 52, so that the first abutting block 52 has a tendency to move along the first guide surface away from the workpiece 20. This arrangement enables the first abutting block 52 to quickly return to an idle position when the lock with the workpiece 20 is released, and maintains the first abutting block 52 in the idle position when the clamp is in the idle state, thereby ensuring that the abutting portion 41 of the abutting arm 40 can stably abut against the side wall of the workpiece 20 when the clamp is clamped again.

[0056] Optionally, the first abutment block 52 is cylindrical, and the first cam 53 abuts against the cylindrical side. This arrangement reduces friction between the first abutment block 52 and the first guide surface, making it easier for the first cam 53 to drive the first abutment block 52 to slide on the first guide surface.

[0057] Furthermore, the circumference of the cylinder abuts against the sidewall of the workpiece 20, and the generatrix of the cylinder is parallel to the sidewall of the workpiece 20. Because the first abutting block 52 is cylindrical, when the generatrix of the cylinder is parallel to the sidewall of the workpiece 20, the contact between the first abutting block 52 and the sidewall of the workpiece 20 approaches line contact, resulting in a small contact area. This is particularly suitable for workpieces 20 with smaller sidewalls or when the sidewalls of the workpiece 20 have a certain inclination angle.

[0058] like Figure 7 As shown, this application takes the cylindrical first abutment block 52 as an example to analyze the force on the workpiece 20 in the locked state. The derivation process is as follows:

[0059] F1+F2=F Q

[0060]

[0061]

[0062]

[0063] Where: F1-friction force of the workpiece on the wedge, N;

[0064] F2- friction force of the clamp body against the wedge, N;

[0065] F J - Clamping force of the wedge on the workpiece, N;

[0066] α-wedge rise angle,°

[0067] F Q -Force applied to the wedge, N

[0068] - Friction angle between the wedge and the workpiece, °

[0069] - Friction angle between the wedge and the clamping body, °

[0070] set up When α is very small (α≤10°), the following formula can be used for approximate calculation

[0071]

[0072] It can be seen that the fixture has an amplifying effect on the applied force, which verifies the rationality of the structural design.

[0073] Optionally, two elastic members are fixed in the first mounting groove 411, one end of the two elastic members is fixed to the abutting portion 41, and the other end is fixed to the axial ends of the first abutting block 52. This arrangement allows the first abutting block 52 to be evenly stressed and balanced.

[0074] Optionally, the clamp further includes a support block 60, which is located on the side of the abutting arm 40 facing away from the workpiece 20, and one end of the support block 60 is rotatably connected to the fixed block 30. The abutting arm 40 is rotatably connected to the fixed block 30, and the two rotation axes are parallel. The abutting portion 41 can move closer to or farther away from the side wall of the workpiece 20, and the other end of the support block 60 can abut against the abutting arm 40. The distance between the two rotation axes is smaller than the distance between the two ends of the support block 60. The abutting arm 40 is rotatably connected to the fixed block 30, so that the abutting arm 40 and the fixed block 30 can be clamped at a certain angle. When it is necessary to clamp a workpiece 20 with a side wall having a certain inclined angle, the angle between the abutting arm 40 and the fixed block 30 is adjusted so that the abutting surface of the abutting portion 41 can still stably abut against the side wall of the workpiece 20. The support block 60 then abuts the abutting arm 40 to maintain the inclined angle, thereby supporting the abutting portion 41 to continuously abut against the inclined side of the workpiece 20. Such a design makes the fixture provided in the present application suitable for clamping workpieces 20 with different contours, improves the adaptability of the fixture, solves the problem of difficult clamping of workpieces 20 with complex contours, and increases the scope of application.

[0075] Optionally, a second elastic member is further included, disposed between the support block 60 and the fixed block 30. The active end of the second elastic member is connected to the support block 60, so that one end of the support block 60 has a tendency to move toward the side where the abutment arm 40 is located. This arrangement allows the support block 60 to maintain abutment with the abutment arm 40 at all times. Once the angle between the abutment arm 40 and the fixed block 30 is adjusted according to the inclination angle of the side wall of the workpiece 20, the fixation is completed without further adjustment of the support block 60.

[0076] Optionally, a plurality of slots 42 are formed on the side of the abutment arm 40 facing away from the workpiece 20, and one end of the support block 60 is plugged into one of the slots 42. The slots 42 are sequentially distributed between the first rotating shaft 51 and the abutment portion 41. With this arrangement, the engagement of the support block 60 with the slots 42 prevents the support block 60 from sliding relative to the abutment arm 40 while maintaining the angle between the abutment arm 40 and the fixed block 30. This provides a more secure support for the abutment arm 40 by the support block 60.

[0077] Optionally, the support seat 10 is provided with a T-slot 11, the fixed block 30 is located in the T-slot 11 and is slidably connected to the support seat 10, and a second mounting groove 31 is provided on the side of the fixed block 30 facing away from the workpiece 20. The second locking assembly includes a second rotating shaft 32 and a second abutment block 34. The second rotating shaft 32 passes through the fixed block 30 and is rotatably connected. A second cam 33 is fixed to one end of the second rotating shaft 32, and the second cam 33 is located in the second mounting groove 31. A second guide surface is also provided in the second mounting groove 31. The second abutment block 34 is slidably connected to the second guide surface. The second abutment block 34 includes an idle position and an abutment position. When in the abutment position, the second abutment block 34 is away from the support seat 10. When in the abutment position, the second abutment block 34 abuts against the bottom wall of the mounting groove, and the fixed block 30 abuts against the limiting protrusion 111 of the T-slot 11. The peripheral side wall of the second cam 33 abuts against the second abutment block 34, which is used to drive the second abutment block 34 to move along the second guide surface from the idle position to the locking position.

[0078] Specifically, the support base 10 is provided with T-shaped slots 11 along the first direction and the second direction to form a grid-like distribution, and the first direction and the second direction are perpendicular to each other.

[0079] Specifically, the T-slot 11 extends along the first direction or the second direction and passes through the end surfaces of the support base 10 on opposite sides, forming installation entrances on the end surfaces, and the fixing block 30 enters the T-slot 11 from the installation entrances.

[0080] With this arrangement, the fixed block 30 can slide along the T-slot 11 to adjust the abutment position and angle between the abutment arm 40 and the side wall of the workpiece 20, depending on the size of the workpiece 20 and the inclination angle of the side wall. After debugging is completed, the second rotating shaft 32 is rotated, and the second cam 33 abuts the second abutment block 34 from the idle position to the locked position. During this process, the fixed block 30 gradually moves toward the open end along the depth direction of the T-slot 11. When the second abutment block 34 is in the locked position, it abuts the bottom wall of the T-slot 11, and the end surface of the fixed block 30 facing away from the second mounting slot 31 abuts the limiting protrusion 111 of the T-slot 11. The relative position of the fixed block 30 and the support base 10 is fixed, thereby making the abutment between the abutment arm 40 and the side wall of the workpiece 20 more stable.

[0081] It should be noted that the first locking assembly and the second locking assembly only differ in installation position and function objects, but their structures are roughly the same, that is, the second locking assembly can also have other structural features of the first locking assembly, which will not be repeated here.

[0082] Optionally, a handle 55 is connected to the other end of the first rotating shaft 51 and / or the second rotating shaft 32. This configuration makes it easier for the operator to rotate the rotating shaft. In particular, when the abutment block contacts the side wall of the workpiece 20 and needs to be further abutted, the abutment block receives a reaction force from the workpiece 20, which damps the rotation of the cam. The operator increases the torque between the abutment block and the rotating shaft by using the handle 55, which helps to overcome the resistance and rotate the rotating shaft more effortlessly.

[0083] The specific operation of the fixture provided in this application is as follows:

[0084] S1. Place the workpiece 20 on the support base 10 with the surface to be processed facing away from the support base 10 .

[0085] S2. The fixed block 30 enters the T-slot 11 from the installation entrance and moves along the T-slot 11 relative to the support seat 10 toward the side where the workpiece 20 is located. After the abutting portion 41 of the abutting arm 40 contacts the side wall of the workpiece 20, the fixed block 30 continues to move, and the angle between the abutting arm 40 and the fixed block 30 is adjusted until the abutting portion 41 of the abutting arm 40 contacts and fixes the side wall of the workpiece 20 as much as possible. The second rotating shaft 32 is rotated to fix the fixed block 30 at its current position.

[0086] S3 . Rotate the first rotating shaft 51 so that the first abutting block 52 moves from the idle position to the locked position, further fixing the workpiece 20 .

[0087] It should be noted that step S3 requires the abutting portions 41 on opposite sides of the workpiece 20 to be performed simultaneously.

[0088] Furthermore, the above are only preferred embodiments of the present invention and the technical principles employed. Those skilled in the art will appreciate that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments, and substitutions are possible for those skilled in the art without departing from the scope of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments and may include many other equivalent embodiments without departing from the scope of the present invention. The scope of the present invention is determined by the scope of the appended claims.

Claims

1. A fixture, characterized in that include: A support seat (10), wherein the support seat (10) is used to place a workpiece (20); A fixing block (30), the fixing block (30) being mounted on the support seat (10), and the fixing blocks (30) being arranged in pairs on opposite sides of the workpiece (20); an abutting arm (40), one end of the abutting arm (40) being connected to the fixing block (30), and the other end being provided with an abutting portion (41), the abutting portion (41) being capable of abutting against a side wall of the workpiece (20), and a first mounting groove (411) being provided on a side of the abutting portion (41) facing the workpiece (20); The first locking assembly comprises a first rotating shaft (51) and a first abutting block (52), the first rotating shaft (51) passes through the abutting portion (41) and is rotatably connected, a first cam (53) is fixed to one end of the first rotating shaft (51), the first cam (53) is located in the first mounting groove (411), a first guide surface is further provided in the first mounting groove (411), the first abutting block (52) is slidably connected to the first guide surface, the first abutting block (52) comprises an idle position away from the workpiece (20) and a locking position abutting against the workpiece (20), the peripheral side wall of the first cam (53) is in contact with the first abutting block (52) abutment, used for driving the first abutment block (52) to move along the first guide surface from the idle position to the locked position, a rotation-stopping portion (412) is provided in the first mounting groove (411), when the first abutment block (52) is located in the idle position, the abutment position of the first cam (53) and the first abutment block (52) is located on one side of the first rotating shaft (51), when the first abutment block (52) is located in the locked position, the abutment position of the first cam (53) and the first abutment block (52) is located on the other side of the first rotating shaft (51), and the first cam (53) abuts against the rotation-stopping portion (412) along the rotation direction; The invention also includes a support block (60), wherein the support block (60) is located on a side of the abutting arm (40) facing away from the workpiece (20), and one end of the support block (60) is rotatably connected to the fixed block (30) around a first axis, and the abutting arm (40) is rotatably connected to the fixed block (30) around a second axis, the first axis is parallel to the second axis, the abutting portion (41) can be close to the side wall of the workpiece (20), the other end of the support block (60) can abut against the abutting arm (40), and the distance between the first axis and the second axis is smaller than the distance between the two ends of the support block (60).

2. The clamp according to claim 1, characterized in that A rubber pad is provided on one end surface of the abutting portion (41) facing the workpiece (20).

3. The clamp according to claim 1, characterized in that The first locking assembly further includes a first elastic member (54), the first elastic member (54) being disposed in the first mounting groove (411), and an active end of the first elastic member (54) being connected to the first abutment block (52), so that the first abutment block (52) has a tendency to move away from the workpiece (20) along the first guide surface.

4. The clamp according to claim 3, characterized in that The first abutment block (52) is in the form of a cylinder, and the circumferential side of the first cam (53) abuts against the circumferential side of the cylinder.

5. The clamp according to claim 4, characterized in that Two first elastic members (54) are fixed in the first installation groove (411), one end of the two first elastic members (54) is fixed to the abutting portion (41), and the other end is fixed to the axial ends of the first abutting block (52).

6. The clamp according to claim 1, wherein: It also includes a second elastic member, which is arranged between the support block (60) and the fixed block (30), and the action end of the second elastic member is connected to the support block (60), so that one end of the support block (60) has a movement tendency to abut against the abutting arm (40).

7. The clamp according to claim 1, wherein: A plurality of slots (42) are provided on a side of the abutting arm (40) facing away from the workpiece (20), one end of the supporting block (60) is plugged into one of the plurality of slots (42), and the plurality of slots (42) are distributed in sequence between the first rotating shaft (51) and the abutting portion (41).

8. The clamp according to claim 1, wherein: The support seat (10) is provided with a T-shaped slot (11), the fixed block (30) is located in the T-shaped slot (11) and is slidably connected to the support seat (10), the fixed block (30) is provided with a second installation slot (31) on the side facing away from the workpiece (20) and is provided with a second locking assembly, the second locking assembly includes a second rotating shaft (32) and a second abutting block (34), the second rotating shaft (32) passes through the fixed block (30) and is rotatably connected, a second cam (33) is fixed to one end of the second rotating shaft (32), the second cam (33) is located in the second installation slot (31), and the second installation slot (31) is also provided with a The second guide surface, the second abutting block (34) is slidably connected to the second guide surface, the second abutting block (34) includes an idle position and an abutting position, when in the abutting position, the second abutting block (34) is away from the support seat (10), when in the abutting position, the second abutting block (34) abuts against the bottom wall of the mounting groove, and the fixing block (30) abuts against the limiting protrusion (111) of the T-shaped groove (11), and the peripheral side wall of the second cam (33) abuts against the second abutting block (34), which is used to drive the second abutting block (34) to move along the second guide surface from the idle position to the locking position.

9. The clamp according to any one of claims 1 to 8, characterized in that: The other end of the first rotating shaft (51) and / or the second rotating shaft (32) is connected to a handle (55).

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