A clamp with positioning function

Abstract

This utility model relates to the field of adaptive clamping equipment, and more particularly to a clamping device with positioning function, comprising a base plate, a movable plate, and fixing screws. A fixed plate is connected to both the left and right ends and the front and rear ends of the top surface of the base plate. A bidirectional lead screw is rotatably connected between the two fixed plates on the left end, and a motor is mounted on one of the fixed plates. The output shaft of the motor is fixedly connected to the end of the bidirectional lead screw. A guide rod is connected between the two fixed plates on the right end. One end of the movable plate is slidably connected to the bidirectional lead screw, and the other end is slidably connected to the guide rod. A limit block is slidably connected inside the movable plate. A locking component is provided at the connection end between the movable plate and the bidirectional lead screw, which is used to move and stabilize the position of the movable plate. By cooperating with the bidirectional lead screw and the locking component, the traditional spring clamping is replaced. Constant transmission of clamping force is achieved through rigid transmission and mechanical locking, significantly improving the reliability of the clamping device during long-term use and extending the equipment lifespan.

Description

Technical Field

[0001] This utility model relates to the field of adaptive clamping equipment, and in particular to a clamping device with positioning function. Background Technology

[0002] In the field of precision casting, the casting and demolding of wax models are core technological steps. The process typically involves a lifting cylinder driving a lifting rod to eject the wax model from the mold, thus achieving demolding. However, due to the diverse sizes and complex shapes of wax models, traditional fixtures are ill-suited for workpieces of different specifications, preventing the wax model from being directly clamped onto the mold table of the mold opening and closing device. This problem not only affects demolding efficiency but can also cause surface damage or positioning deviations to the wax model due to unstable clamping, ultimately impacting the accuracy of the final casting.

[0003] Currently, the small mold clamping fixture with announcement number CN216656233U uses a spring mechanism to dynamically adjust the clamping force, making it suitable for fixing small-sized molds. While this type of clamping fixture simplifies the operation process to some extent by using elastic elements to provide clamping force, its design has significant limitations.

[0004] Under long-term, high-frequency use, individual springs are prone to fatigue and loss of elasticity, resulting in decreased or uneven distribution of clamping force, which directly affects clamping stability and leads to insufficient alignment accuracy. This makes it difficult to ensure accurate alignment between the mold and the mold table, especially in multi-station or complex-shaped molds, which can easily cause misalignment and increase subsequent processing errors. Utility Model Content

[0005] To overcome the shortcomings of insufficient accuracy and stability, this utility model provides a clamp with positioning function.

[0006] A positioning fixture includes a base plate, a movable plate, and a fixing screw. The base plate has a central hole in the middle. A fixing plate is connected to both the left and right ends and the front and rear of the top surface of the base plate. A bidirectional lead screw is rotatably connected between the two fixing plates on the left end, and a motor is mounted on one of the fixing plates. The output shaft of the motor is fixedly connected to the end of the bidirectional lead screw. A guide rod is connected between the two fixing plates on the right end. One end of the movable plate is slidably connected to the bidirectional lead screw, and the other end is slidably connected to the guide rod. A limit block is slidably connected inside the movable plate. A locking groove is formed on the movable plate, and the fixing screw passes through the locking groove and is threadedly connected to the limit block. A locking assembly is provided at the connection end between the movable plate and the bidirectional lead screw, and the locking assembly is used to move and stabilize the position of the movable plate.

[0007] Preferably, the locking assembly includes a mounting cylinder, the left end of the movable plate is connected to the mounting cylinder, a contact rod is slidably connected inside the mounting cylinder, the contact rod is driven by the bidirectional lead screw, a limit rod is connected to the top of the contact rod, the limit rod passes through the mounting cylinder and is connected to a pressing plate, and a return spring is provided inside the mounting cylinder, one end of the return spring is connected to the mounting cylinder and the other end is connected to the top of the contact rod.

[0008] Preferably, the device also includes a telescopic rod, the two ends of which are respectively connected to the right ends of the two movable plates. A gear is rotatably connected to the middle of the side of the two movable plates that are separated from each other. A rack is connected to the side of the limiting block that is separated from each other. The rack meshes with the gear, and the rack connected to the limiting block connected to the same movable plate is located on the upper and lower sides of the gear.

[0009] Preferably, an operating lever is connected to the top of the limiting block.

[0010] Preferably, a scale is provided on the top of the movable plate.

[0011] Preferably, a protective housing is connected to the opposite side of the movable plate, and the protective housing encloses the gear and the rack.

[0012] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0013] By cooperating with the bidirectional lead screw and locking assembly, the threaded drive directly pushes the moving plate to move. The contact rod and the limit rod form a mechanical hard limit, replacing the traditional spring clamping. Through rigid transmission and mechanical locking, the constant transmission of clamping force is achieved, which significantly improves the reliability of the fixture for long-term use and extends the service life of the equipment. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0015] Figure 2 This is a schematic diagram of the installation structure of the base plate and the fixing plate of this utility model.

[0016] Figure 3 This is a cross-sectional view showing the connection relationship between the bidirectional lead screw and the contact rod of this utility model.

[0017] Figure 4 This is a schematic diagram showing the connection relationship between the gear and rack of this utility model.

[0018] Reference numerals: 1_Base plate, 101_Center hole, 2_Fixing plate, 3_Motor, 4_Double-acting lead screw, 5_Moving plate, 6_Mounting cylinder, 7_Contact rod, 8_Limit rod, 9_Reset spring, 10_Guide rod, 11_Locking groove, 12_Limit block, 13_Fixing screw, 14_Gear, 15_Rack, 16_Telescopic rod, 17_Operating lever, 18_Scale, 19_Protective housing. Detailed Implementation

[0019] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0020] Example: A clamp with positioning function, such as Figures 1-4 As shown, the assembly includes a base plate 1, a fixed plate 2, a motor 3, a bidirectional lead screw 4, a moving plate 5, a locking assembly, a guide rod 10, a limit block 12, and a fixing screw 13. The base plate 1 has a central hole 101 for ejecting material. A fixed plate 2 is connected to both the left and right ends and the front and rear parts of the top surface of the base plate 1. A bidirectional lead screw 4 is rotatably connected between the two fixed plates 2 on the left end, and a motor 3 is mounted on one of the fixed plates 2. The output shaft of the motor 3 is fixedly connected to the end of the bidirectional lead screw 4. A guide rod 10 is connected between the two fixed plates 2 on the right end. One end of the movable plate 5 is slidably connected to the bidirectional lead screw 4, and the other end is slidably connected to the guide rod 10. A limit block 12 is slidably connected inside the movable plate 5. The limit block 12 is provided with an inclined surface facing the center hole 101. A locking groove 11 is opened on the movable plate 5. The fixing screw 13 passes through the locking groove 11 and is threadedly connected to the limit block 12. When the inclined surfaces of the four limit blocks 12 are all in contact with the workpiece surface, the fixing screw 13 is tightened to complete the locking. A locking component is provided at the connection end between the movable plate 5 and the bidirectional lead screw 4. The locking component is used to move and stabilize the position of the movable plate 5.

[0021] like Figure 2 and Figure 3 As shown, the locking assembly includes a mounting cylinder 6, a contact rod 7, a limiting rod 8, and a return spring 9. The mounting cylinder 6 is connected to the left end of the moving plate 5. The contact rod 7 is slidably connected inside the mounting cylinder 6. The contact rod 7 is in transmission engagement with the bidirectional lead screw 4. When the operator starts the motor 3, the bidirectional lead screw 4 rotates between the fixed plates 2. The bottom end of the contact rod 7 engages with the thread groove of the bidirectional lead screw 4 to form a transmission engagement, pushing the moving plates 5 on both sides to slide horizontally along the guide rod 10 toward the center hole 101. The top of the contact rod 7 is connected to the limiting rod 8. The limiting rod 8 passes through the mounting cylinder 6 and is connected to a pressing plate. The return spring 9 is installed inside the mounting cylinder 6. One end of the return spring 9 is connected to the mounting cylinder 6, and the other end is connected to the top of the contact rod 7. An L-groove is opened on the side of the mounting cylinder 6. A handle extends horizontally from the contact rod 7 and is slidably connected in the L-groove.

[0022] like Figure 4As shown, it also includes a gear 14, a rack 15, and a telescopic rod 16. The two ends of the telescopic rod 16 are respectively connected to the right ends of the two moving plates 5. The gear 14 is rotatably connected to the middle of the side of the two moving plates 5 that is separated from each other. The rack 15 is connected to the side of the limiting block 12 that is separated from each other. The rack 15 meshes with the gear 14. The rack 15 connected to the limiting block 12 connected to the same moving plate 5 is located on the upper and lower sides of the gear 14 respectively. When one side of the limiting block 12 is manually adjusted, the other side of the limiting block 12 moves in the opposite direction synchronously to ensure that the two inclined planes always symmetrically approach the workpiece.

[0023] like Figure 4 As shown, it also includes an operating lever 17. The top of the limiting block 12 is connected to the operating lever 17, and the worker can directly drive the limiting block 12 to slide along the moving plate 5 through the operating lever 17.

[0024] like Figure 4 As shown, it also includes a scale 18. The top of the movable plate 5 is equipped with a scale 18. According to the size of the workpiece, the worker can adjust the sliding range of the limit block 12 in the locking groove 11 in advance by observing the value of the scale 18, thereby reducing repeated fine adjustments during the clamping process.

[0025] like Figure 1 and Figure 4 As shown, it also includes a protective housing 19. The protective housing 19 is connected to the side of the movable plate 5 away from it. The protective housing 19 encloses the gear 14 and the rack 15. The gear 14 and the rack 15 are stably meshed inside the protective housing 19 to avoid dust and debris interfering with the transmission accuracy and reduce the risk of mechanical damage.

[0026] The operator starts motor 3 to drive the bidirectional lead screw 4 to rotate. The bidirectional lead screw 4, through the threaded transmission of contact rod 7, pushes the two moving plates 5 on both sides to move synchronously towards the center hole 101 along guide rod 10. At this time, the fixing screw 13 is loosened, and the operator directly drives the limit block 12 to slide along the moving plate 5 through operating rod 17. The limit block 12 moves synchronously through gear 14 and rack 15, and finally the inclined surfaces of the four limit blocks 12 gradually approach the surface of the workpiece to be clamped, forming a preliminary self-adaptive clamping. After adjustment, the fixing screw 13 is tightened to fix the position of the limit block 12.

[0027] After clamping is complete, the pressing plate of the locking assembly is pressed down, causing the contact rod 7 to move downwards, so that the limit rod 8 and the thread of the bidirectional lead screw 4 are tightly engaged, and the return spring 9 is stretched at the same time. Then, by rotating the handle on the side of the contact rod 7, it is locked into the lateral end of the L-shaped groove on the side wall of the mounting cylinder 6, limiting the rebound of the contact rod 7 and ensuring that the position of the moving plate 5 is locked. At this time, the gear 14 and the rack 15 work together to keep the limit blocks 12 on both sides moving synchronously and symmetrically, avoiding unilateral deviation.

[0028] When releasing the workpiece, the reverse-acting handle disengages from the L-shaped slot, the return spring 9 contracts, causing the contact rod 7 to move upward, and the limit rod 8 disengages from the double-acting lead screw 4. The motor 3 drives the double-acting lead screw 4 to rotate in the reverse direction, the moving plate 5 returns to its initial position along the guide rod 10, and the telescopic rod 16 retracts synchronously with the moving plate 5. The limit block 12 maintains symmetrical reset under the transmission of the gear 14 and rack 15, and the scale 18 provides a position prediction reference, shortening the adjustment time for the next cycle.

[0029] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. A clamp with positioning function, characterized in that, The system includes a base plate (1), a movable plate (5), and fixing screws (13). The base plate (1) has a central hole (101) in the middle. A fixing plate (2) is connected to both the left and right ends and the front and rear parts of the top surface of the base plate (1). A bidirectional lead screw (4) is rotatably connected between the two fixing plates (2) on the left end. A motor (3) is installed on one of the fixing plates (2). The output shaft of the motor (3) is fixedly connected to the end of the bidirectional lead screw (4). A guide rod is connected between the two fixing plates (2) on the right end. (10) One end of the moving plate (5) is slidably connected to the bidirectional lead screw (4), and the other end is slidably connected to the guide rod (10). A limit block (12) is slidably connected inside the moving plate (5). A locking groove (11) is opened on the moving plate (5). The fixing screw (13) passes through the locking groove (11) and is threadedly connected to the limit block (12). A locking component is provided at the connection end between the moving plate (5) and the bidirectional lead screw (4). The locking component is used to move and stabilize the position of the moving plate (5).

2. A clamp with positioning function according to claim 1, characterized in that, The locking assembly includes a mounting cylinder (6), the left end of the movable plate (5) is connected to the mounting cylinder (6), a contact rod (7) is slidably connected inside the mounting cylinder (6), the contact rod (7) is driven by the bidirectional lead screw (4), a limit rod (8) is connected to the top of the contact rod (7), the limit rod (8) passes through the mounting cylinder (6) and is connected to a pressing plate, and a return spring (9) is provided inside the mounting cylinder (6), one end of the return spring (9) is connected to the mounting cylinder (6), and the other end is connected to the top of the contact rod (7).

3. A clamp with positioning function according to claim 2, characterized in that, It also includes a telescopic rod (16), the two ends of which are connected to the right ends of the two movable plates (5). A gear (14) is rotatably connected to the middle of the side of the two movable plates (5) that are separated from each other. A rack (15) is connected to the side of the limiting block (12) that is separated from each other. The rack (15) meshes with the gear (14). The rack (15) connected to the limiting block (12) connected to the same movable plate (5) is located on the upper and lower sides of the gear (14).

4. A clamp with positioning function according to claim 3, characterized in that, The top of the limiting block (12) is connected to an operating rod (17).

5. A clamp with positioning function according to claim 4, characterized in that, A scale (18) is provided on the top of the movable plate (5).

6. A clamp with positioning function according to claim 5, characterized in that, A protective shell (19) is connected to the opposite side of the movable plate (5), and the protective shell (19) encloses the gear (14) and the rack (15).

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