A clamp to prevent workpiece from loosening

Abstract

This utility model provides a clamping device to prevent workpiece loosening, used for clamping and machining workpieces. It includes a base and a clamping assembly. The base has a receiving groove, within which are a first step and a second step. Two guide rails are provided on the first step. The clamping assembly includes a wedge block, a clamping block, and a locking assembly. The bottom of the clamping block slides within a groove formed between the guide rails. The clamping block abuts against the wedge block located on the second step. The locking assembly passes sequentially from the bottom of the base through the second step and the wedge block, fixing the wedge block to the second step. This utility model provides good clamping force and effectively prevents machining errors caused by screw deformation during workpiece clamping.

Description

Technical Field

[0001] This utility model relates to the field of clamping technology, specifically to a clamping device for preventing workpieces from loosening. Background Technology

[0002] In existing processing, some workpieces need to be processed before assembling the equipment. Before processing the workpieces, it is usually necessary to use a fixture to clamp and fix them. If the fixture is unstable, it may cause errors in the processing of the workpieces.

[0003] In the prior art, such as Chinese Patent No. 202422241313.8, published on July 11, 2025, a machining fixture is disclosed, relating to the field of machining technology. It includes a support assembly and a clamping assembly. The support assembly includes a support member, which includes a support base and a partition. The support base has a groove at its top, and the partition is located in the middle of the groove. The partition is integrally formed with the support base, dividing the support base into two cavities. The clamping assembly includes two clamping seats and two driving members. Each of the two clamping seats is located within one of the cavities. The clamping seats are slidably connected to the support base, and the two clamping seats clamp the product. The sidewalls of the clamping seats are in contact with the groove wall. The driving members correspond one-to-one with the cavities, are connected to the partition, and are connected to the clamping seats to drive their movement.

[0004] The aforementioned literature describes adjusting the position of the clamping seat by driving a screw to facilitate operator operation and improve product processing efficiency. However, when clamping a workpiece using a screw, the clamping force acts on the screw and nut. Since the force-bearing surface of the screw and nut is small, and the screw and nut also need to perform rotational transmission, the clearance between the screw and nut increases over time, making it prone to loosening. This results in inadequate clamping and consequently, errors in the processed workpiece. Utility Model Content

[0005] The purpose of this utility model is to provide a clamp that prevents workpieces from loosening. It has good clamping force and can effectively prevent machining errors in the workpieces caused by deformation of the screw under force when clamping the workpieces.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a clamp for preventing workpiece loosening, used for clamping and processing workpieces, including a base and a clamping assembly. The base is provided with a receiving groove, and the receiving groove is provided with a first step and a second step. The first step is provided with a sliding groove extending along the length direction of the first step. The clamping assembly includes a wedge block, a pressing block and a locking assembly. The bottom of the pressing block is slidably disposed in the sliding groove formed between the guide rails. The pressing block abuts against the wedge block disposed on the second step. The locking assembly passes through the second step and the wedge block sequentially from the bottom of the base and then fixes the wedge block on the second step.

[0007] The above setup, when clamping a workpiece, first installs the guide plate and clamping block on the first step of the receiving groove, allowing the clamping block to slide within the groove on the first step to the end away from the second step. Then, the wedge block is placed on the second step. Next, the locking assembly passes through the second step and the wedge block sequentially from the bottom of the base. After the clamping block slides within the groove and abuts against the wedge block, the workpiece to be processed can be placed on the first step. Simultaneously, the clamping block, acting horizontally with the base, limits the workpiece from both sides. Finally, the locking assembly fixes the wedge block to the second step, thus ensuring the wedge block remains in place in water. The clamping block cannot move in the horizontal direction because it abuts against the wedge block, and the lower end of the clamping block also slides within the groove. This restricts the lower end of the clamping block from moving vertically, preventing it from moving after clamping the workpiece in the horizontal direction. During this process, since the locking assembly fixes the wedge block vertically, the force exerted by the wedge block on the locking assembly in the horizontal direction does not affect the force exerted by the locking assembly on the wedge block in the vertical direction. This effectively prevents machining errors caused by deformation of the locking assembly when clamping the workpiece.

[0008] Furthermore, two guide rails are provided on the first step, and a groove is formed between the two guide rails.

[0009] The above configuration, with the two guide rails on the first step forming a groove, allows for easy replacement of the two guide rails to create grooves of different widths.

[0010] Furthermore, the two ends of the base protrude upward to form a first boss and a second boss, and a receiving groove is formed between the first boss and the second boss.

[0011] The above settings facilitate the limiting function of the workpiece placed on the base by the first boss.

[0012] Furthermore, one end of the first step portion is adjacent to the first boss, and the other end of the first step portion is adjacent to the second step portion, and the second step portion is higher than the first step portion.

[0013] The above arrangement allows the guide plate to be placed flush with the second step after the first step, which facilitates the movement of the clamping block on the guide plate and its engagement with the wedge block located on the second step.

[0014] Furthermore, the first step portion is provided with two or more mounting holes, the guide rail plate is provided with through holes corresponding to the mounting holes, and a third protrusion is formed on one side of the guide rail plate that is close to each other. A gap is formed between the third protrusions on the two guide rail plates. After the guide rail plate is installed on the first step portion, a sliding groove is formed between the third protrusions on the two guide rail plates and the first step portion.

[0015] The above configuration facilitates the installation of the guide rail plate on the first step by passing bolts through the through holes, thereby allowing the clamping block to slide within the groove along the length of the guide rail plate.

[0016] Furthermore, the bottom of the clamping block is provided with a first protrusion that matches the slide groove, one side of the clamping block is arranged parallel to the first protrusion, and the other side of the clamping block forms a first inclined surface.

[0017] The above configuration allows one side of the clamping block to work together with the first boss to clamp and limit the workpiece from both sides.

[0018] Furthermore, one side of the wedge block forms a second inclined surface, and the other side of the wedge block forms a third inclined surface, with the second inclined surface matching and fitting the first inclined surface.

[0019] The above settings ensure that after the clamping block clamps the workpiece, it can fully match and abut against the wedge block, preventing misalignment of the clamping block.

[0020] Furthermore, a guide groove is formed on the third inclined surface in a direction perpendicular to the third inclined surface, recessed into the wedge block. The two ends of the guide groove are respectively provided through the upper end face and the lower end face of the wedge block. A fourth inclined surface is formed on one side of the second protrusion near the second step. The third inclined surface and the fourth inclined surface are matched and fitted together. A second protrusion matching the guide groove is provided on the fourth inclined surface.

[0021] The above design allows the wedge block to be accurately installed on the second step by engaging with the second protrusion through the guide groove. It also limits the wedge block installed on the second step, preventing misalignment of the wedge block on the second step.

[0022] Furthermore, the locking assembly includes a first locking member and a second locking member. The lower end of the first locking member is provided with a limiting protrusion. The upper end of the first locking member protrudes from the upper end surface of the wedge block through a through hole provided on the base, a through hole on the second step, and a through hole on the wedge block. The second locking member is sleeved on the upper end of the first locking member and is screwed to match the upper end of the first locking member. After connection, the second locking member abuts against the upper end surface of the wedge block.

[0023] With the above configuration, the wedge block can be fixed on the second step by the mutual cooperation of the first and second locking parts in the vertical direction. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0025] Figure 2 This is an exploded view of the present invention.

[0026] Figure 3 for Figure 1 Sectional view at point AA.

[0027] Figure 4 for Figure 1 Sectional view at point BB. Detailed Implementation

[0028] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0029] like Figure 1-4 As shown, this utility model provides a clamp to prevent workpiece loosening, used for clamping and processing workpieces. It includes a base 1 and a clamping assembly. The clamping assembly includes a wedge block 9, a clamping block 8, and a locking assembly. The base 1 is provided with a receiving groove 2. The two ends of the base 1 protrude upward to form a first boss 3 and a second boss 4. In this embodiment, a receiving groove 2 is formed between the first boss 3 and the second boss 4. A first step portion 5 and a second step portion 6 are provided in the receiving groove 2. One end of the first step portion 5 is adjacent to the first boss 3, and the other end of the first step portion 5 is adjacent to the second step portion 6. The second step portion 6 is higher than the first step portion 5. Two guide rail plates 7 are provided on the first step portion 5, so that the guide rail plates 7 are placed after the first step portion 5 and are flush with the second step portion 6, thereby facilitating the movement of the clamping block 8 on the guide rail plate 7 and cooperating with the wedge block 9 provided on the second step portion 6.

[0030] like Figure 2 and 4As shown, the first step portion 5 is provided with two or more mounting holes, and the guide rail plate 7 is provided with through holes corresponding to the mounting holes, so that the guide rail plate 7 can be installed on the first step portion 5 by passing bolts through the through holes. The side of the guide rail plate 7 that is close to each other extends horizontally to form a third protrusion 10. A gap is formed between the third protrusions 10 on the two guide rail plates 7. After the guide rail plate 7 is installed on the first step portion 5, a sliding groove 11 is formed between the third protrusions 10 on the two guide rail plates 7 and the first step portion 5. A first protrusion 16 matching the sliding groove 11 is provided at the bottom of the clamping block 8, so that the clamping block 8 can slide in the sliding groove 11 along the length direction of the guide rail plate 7, thereby realizing the sliding setting of the bottom of the clamping block 8 in the sliding groove 11 formed between the guide rail plates 7.

[0031] like Figure 2 As shown, one side of the clamping block 8 is parallel to the first boss 3, and the other side of the clamping block 8 forms a first inclined surface 12, so that one side of the clamping block 8 and the first boss 3 work together to limit and clamp the workpiece from both sides. One side of the wedge block 9 forms a second inclined surface 13, and the other side of the wedge block 9 forms a third inclined surface 14. The second inclined surface 13 matches and fits the first inclined surface 12. The second inclined surface is inclined downward and inward from the wedge block 9, so that after the clamping block 8 clamps the workpiece, it can completely match and abut against the wedge block 9 set on the second step 6, preventing the clamping block 8 from being misaligned. On the third inclined surface 14, along the perpendicular to the third inclined surface 12... A guide groove 22 is formed by recessing the wedge block 9 in the direction of 4. The two ends of the guide groove 22 are respectively set through the upper end face and the lower end face of the wedge block 9. A fourth inclined surface 15 is formed on one side of the second protrusion 4 near the second step portion 6. The third inclined surface 14 is inclined downward and inward from the wedge block 9. The third inclined surface 14 and the fourth inclined surface 15 are matched and fitted together. A second protrusion 17 matching the guide groove 22 is provided on the fourth inclined surface 15. At the same time, it is convenient for the wedge block 9 to cooperate with the second protrusion 17 through the guide groove 22, so that it can be accurately installed on the second step portion 6. At the same time, it plays a limiting role for the wedge block 9 installed on the second step portion 6, and prevents the wedge block 9 from being misaligned on the second step portion 6.

[0032] like Figure 1 , 2As shown in Figure 3, the locking assembly passes through the second step 6 and the wedge block 9 sequentially from the bottom of the base 1, and then fixes the wedge block 9 onto the second step 6. The locking assembly includes a first locking member 18 and a second locking member 19. The lower end of the first locking member 18 is provided with a limiting protrusion 21, and the bottom of the base 1 is provided with a countersunk hole that matches the limiting protrusion 21. The upper end of the first locking member 18 sequentially passes through the through hole provided on the base 1, the through hole provided on the second step 6, and the through hole provided on the wedge block 9. The hole protrudes from the upper end face of the wedge block 9, while the limiting protrusion 21 at the lower end of the first locking member 18 is accommodated in the countersunk hole (not shown in the figure). The second locking member 19 is sleeved on the upper end of the first locking member 18 and is screwed to match the upper end of the first locking member 18. After connection, the second locking member 19 abuts against the upper end face of the wedge block 9. In this way, the wedge block 9 can be fixed on the second step portion 6 through the mutual cooperation of the first locking member 18 and the second locking member 19 in the vertical direction. In this embodiment, the first locking member 18 is a bolt, and the second locking member 19 is a nut that matches the bolt. When the nut is screwed onto the bolt, it can be achieved by using a wrench 20.

[0033] The working principle of this utility model is as follows: When it is necessary to clamp the workpiece, firstly, a guide rail plate 7 is installed on the first step portion 5 of the receiving groove 2 by bolts. Then, one side of the first protrusion 16 at the bottom of the clamping block 8 abuts against the sliding groove 11 formed below the third protrusion 10 of the guide rail plate 7. Next, another guide rail plate 7 is installed on the first step portion 5 of the receiving groove 2, so that the other side of the first protrusion 16 at the bottom of the clamping block 8 abuts against the sliding groove 11 formed below the third protrusion 10 of the other guide rail plate 7, so as to realize that the clamping block 8 slides in the sliding groove 11 formed between the guide rail plates 7. Then, the wedge block 9 is placed on the second step portion 6, and the locking assembly passes through the second step portion 6 from the bottom of the base 1. Step 6 and wedge block 9: After clamping block 8 slides in slide groove 11 and abuts against wedge block 9, the workpiece to be processed is placed on guide rail plate 7. At the same time, clamping block 8 works together with base 1 in the horizontal direction to limit the workpiece from both sides. Finally, wedge block 9 is fixed on second step 6 by locking assembly, so that wedge block 9 cannot move in the horizontal direction. Since clamping block 8 abuts against wedge block 9, clamping block 8 cannot move after clamping the workpiece in the horizontal direction, thus clamping the workpiece and effectively preventing the workpiece from having processing errors due to deformation of locking assembly when clamping the workpiece.

Claims

1. A fixture for clamping a workpiece for machining, to prevent workpiece loosening, characterised in that: The device includes a base and a clamping assembly. The base has a receiving groove, and the receiving groove has a first step and a second step. A sliding groove extends along the length of the first step. The clamping assembly includes a wedge block, a pressing block, and a locking assembly. The bottom of the pressing block slides within the sliding groove formed between the guide rails. The pressing block abuts against the wedge block provided on the second step. The locking assembly passes through the second step and the wedge block sequentially from the bottom of the base and then fixes the wedge block on the second step.

2. The fixture of claim 1, wherein: The first step is equipped with two guide rails, and a groove is formed between the two guide rails.

3. The fixture of claim 1, wherein: The base has two ends that protrude upward to form a first boss and a second boss, and a receiving groove is formed between the first boss and the second boss.

4. The fixture of claim 1, wherein: One end of the first step portion is adjacent to the first boss, and the other end of the first step portion is adjacent to the second step portion, with the second step portion being higher than the first step portion.

5. The fixture of claim 2 wherein: The first step portion has two or more mounting holes, and the guide rail plate has through holes corresponding to the mounting holes. A third protrusion extends from one side of the guide rail plate that is close to each other, and a gap is formed between the third protrusions on the two guide rail plates. After the guide rail plate is installed on the first step portion, a sliding groove is formed between the third protrusions on the two guide rail plates and the first step portion.

6. The fixture of claim 1, wherein: The bottom of the clamping block is provided with a first protrusion that matches the slide groove, one side of the clamping block is arranged parallel to the first protrusion, and the other side of the clamping block forms a first inclined surface.

7. The fixture of claim 1, wherein: One side of the wedge block forms a second inclined surface, and the other side of the wedge block forms a third inclined surface. The second inclined surface is matched and fitted with the first inclined surface.

8. The fixture of claim 7, wherein: A guide groove is formed on the third inclined surface in a direction perpendicular to the third inclined surface and recessed into the wedge block. The two ends of the guide groove are respectively set through the upper end face and the lower end face of the wedge block. A fourth inclined surface is formed on one side of the second protrusion near the second step. The third inclined surface and the fourth inclined surface are matched and fitted together. A second protrusion matching the guide groove is provided on the fourth inclined surface.

9. The fixture of claim 1, wherein: The locking assembly includes a first locking member and a second locking member. The lower end of the first locking member is provided with a limiting protrusion. The upper end of the first locking member protrudes from the upper end surface of the wedge block through a through hole provided on the base, a through hole on the second step, and a through hole on the wedge block. The second locking member is sleeved on the upper end of the first locking member and is screwed to match the upper end of the first locking member. After connection, the second locking member abuts against the upper end surface of the wedge block.

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