Self-locking type mechanical clamp

Abstract

The self-locking type mechanical clamp comprises a sleeve, a transmission universal joint, a rotary drum, a gear, a rotary shaft, a rotary connecting plate, a clamping block connecting block and a clamping block, a driving shaft is arranged in the sleeve, a transmission shaft is arranged in the rotary drum, and the driving shaft and the transmission shaft are connected through the transmission universal joint; the transmission shaft is sleeved with a threaded block which can rotate along with the transmission shaft and slide in the axial direction of the transmission shaft, the threaded block is meshed with a gear, and the gear drives the rotating shaft and the rotating connecting plate to swing and further drives the clamping block connecting block and the clamping block to move horizontally to achieve clamping or loosening. According to the clamp, workpieces can be clamped in various different working environments, the clamping direction can be changed to adapt to the workpieces of different shapes and sizes, and long-time self-locking can be completed.

Description

Technical Field

[0001] The invention relates to the technical field of tooling fixtures, in particular to a self-locking mechanical fixture. Background Art

[0002] The device used to fix the processing object in the mechanical manufacturing process so that it occupies the correct position for construction or inspection is also called a fixture. In a broad sense, any device used to quickly, conveniently and safely install the workpiece in any process of the process can be called a fixture.

[0003] A fixture is a mechanical device used to fix and position workpieces in industrial production. It usually consists of a clamping device and a supporting device. The clamping device can fix the workpiece tightly on the workbench, and the supporting device can provide the necessary support force to ensure that the workpiece will not move or loosen during processing.

[0004] In industrial production, the clamping direction of the fixture needs to be adjusted accordingly because the workpieces to be processed or measured have different shapes, sizes, and positions. In addition, in many processing or measuring processes, the workpiece needs to be clamped and fixed for a long time, which requires the fixture to be self-locking for a long time. In view of this, the existing structure and defects are studied and improved, and a self-locking mechanical fixture is proposed. Summary of the invention

[0005] The object of the present invention is to provide a self-locking mechanical clamp to solve the problems raised in the above background technology.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a self-locking mechanical clamp, comprising a transmission assembly and a clamping assembly; the transmission assembly comprises a sleeve, a transmission universal joint and a rotating cylinder; a driving shaft and a second transmission connecting shaft block are rotatably arranged in the sleeve, one end of the driving shaft is a power input end, and the other end is fixedly connected to the second transmission connecting shaft block; the second transmission connecting shaft block extends out of the sleeve and is connected to the transmission universal joint; a first transmission connecting shaft block and a transmission shaft are rotatably arranged in the rotating cylinder, one end of the first transmission connecting shaft block extends out of the rotating cylinder and is connected to the second transmission connecting shaft block through a transmission universal joint, and the other end is fixedly connected to the transmission shaft in the rotating cylinder, and the other end of the transmission shaft is sleeved with a threaded block that can rotate with the transmission shaft and can slide along the axial direction of the transmission shaft, and the threaded block is inserted into the clamping assembly to transmit power; the clamping assembly comprises a fixed block, a gear, a rotating shaft, a clamping block A connecting block and a clamping block, wherein a cavity for accommodating two gears is provided in the center of the fixed block, the two gears are symmetrically arranged in the cavity and a central position is reserved, the threaded block is inserted into the center of the cavity of the fixed block and meshes with the two gears for transmission, the gear is rotatably connected to the fixed block through a rotating shaft, the gear is fixedly connected to the rotating shaft, and a rotating connecting plate is provided on both sides of each gear, one end of the rotating connecting plate is fixedly connected to the rotating shaft, and the other end is rotatably connected to the clamping block connecting block; a driven connecting plate is also provided between the fixed block and the clamping block connecting block, and both ends of the driven connecting plate are rotatably connected to the fixed block and the clamping block connecting block respectively, and the fixed block, the rotating connecting plate, the clamping block connecting block and the driven connecting plate together constitute a parallelogram structure; the clamping block connecting block is detachably connected to the clamping block; a nut block matching the threaded block is also provided on the fixed block, and one end of the threaded block is threadedly connected in the nut block.

[0007] Furthermore, the transmission shaft is provided with a slider, the threaded block is provided with an axial slide groove, the slider cooperates with the slide groove so that the threaded block rotates with the transmission shaft and slides axially along the transmission shaft. Furthermore, the transmission shaft is provided with a slider insertion hole, the slider is inserted into the slider insertion hole.

[0008] Furthermore, the rotating drum is fixedly connected to the fixed block via a connecting plate, and the connecting plate comprises a horizontal plate and a vertical plate, the horizontal plate is fixedly connected to the fixed block, and the vertical plate is fixedly connected to the rotating drum.

[0009] Furthermore, a transmission shaft head is provided at one end of the first transmission connection shaft block close to the transmission shaft, and the transmission shaft is fixedly connected to the transmission shaft head.

[0010] Furthermore, a first bearing is provided between the transmission shaft and the rotating drum, the transmission shaft is inserted into the bearing, one end of the transmission shaft extends into the rotating drum and is fixedly connected to the first transmission connecting shaft block, and the other end extends out of the rotating drum and is transmission-connected to the threaded block.

[0011] Furthermore, the transmission universal joint includes two groups of connecting joints, and the two groups of connecting joints are respectively connected to the first transmission connecting shaft block and the second transmission connecting shaft block, and cross universal joints are arranged at the connection points between the two groups of connecting joints and the first transmission connecting shaft block and the second transmission connecting shaft block.

[0012] Furthermore, a folding device is connected between the sleeve and the rotating drum, and the folding device includes a fixed ring and a rotating ring, the fixed ring is sleeved on the outside of the sleeve and fixedly connected to the sleeve, and the rotating ring is sleeved on the outside of the rotating drum and is rotatably connected through a second bearing; a first folding connecting plate is provided on the fixed ring, and a second folding connecting plate is provided on the rotating ring, and the first folding connecting plate and the second folding connecting plate are connected by a hinge.

[0013] Beneficial effects: It can clamp the workpiece in a variety of different working environments, and can change the clamping direction to adapt to workpieces of different shapes and sizes, and can achieve long-term self-locking. The rotating drum and the fixed block are combined or separated through the connecting plate, which is convenient for maintenance and replacement of each component. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the main structure of the present invention;

[0015] Figure 2 It is a perspective schematic diagram of the rotating drum and the fixed block and their connection relationship in the present invention;

[0016] Figure 3 It is a schematic diagram of the structure of the clamping assembly and its connection relationship in the present invention;

[0017] Figure 4 Schematic diagram of the connection relationship between the gear, the rotating shaft, the rotating connecting plate, the driven connecting plate and the fixed block in the present invention ( Figure 2 (a cross-section view from the gear shaft in the middle);

[0018] Figure 5 It is a schematic diagram (axonometric perspective view) of the installation of a transmission shaft according to an embodiment of the present invention;

[0019] Figure 6 A top view of a transmission shaft after installation according to an embodiment of the present invention;

[0020] Figure 7 A schematic diagram of the internal groove structure of a threaded block according to an embodiment of the invention (the external threads are not shown);

[0021] Figure 8 for Figure 7 (external threads not shown);

[0022] Fig. 9 for Figure 7 A top view of (external threads not shown);

[0023] Fig.10 It is a schematic structural diagram of the side surface of the clamping assembly in the present invention;

[0024] Fig.11 It is a front structural schematic diagram of the transmission universal joint and its connection relationship in the present invention;

[0025] Fig.12 It is a schematic structural diagram of the transmission universal joint and its connection relationship in the side of the present invention;

[0026] Fig.13 It is a schematic structural diagram of the cross section of the transmission universal joint and the sleeve in the present invention;

[0027] Fig.14 It is a schematic diagram of the structure of the rotating ring in the present invention.

[0028] In the figure: 1, fixed block; 11, rotating connecting plate; 12, driven connecting plate; 13, rotating shaft; 14, gear; 15, nut block; 2, clamping block connecting block; 21, gasket; 3, clamping block; 4, rotating cylinder; 41, first transmission connecting shaft block; 411, transmission shaft head; 42, first bearing; 43, transmission shaft; 431, slider jack; 432 slider; 44, threaded block; 441 slide groove; 5, connecting plate; 51, horizontal plate; 52, vertical plate; 6, transmission universal joint; 61, connecting joint; 62, cross universal joint; 7, sleeve; 71, second transmission connecting shaft block; 8, folding device; 81, fixed collar; 811, first folding connecting plate; 82, rotating collar; 821, second folding connecting plate; 822, second bearing; 83, hinge; 9, driving shaft. DETAILED DESCRIPTION

[0029] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0030] Reference Figures 1 to 14, a self-locking mechanical clamp, including a transmission assembly and a clamping assembly; the transmission assembly includes a sleeve 7, a transmission universal joint 6 and a rotating drum 4; a driving shaft 9 and a second transmission connecting shaft block 71 are rotatably arranged in the sleeve 7, one end of the driving shaft 9 is a power input end (connecting a handle or a motor, etc.), and the other end is fixedly connected to the second transmission connecting shaft block 71; the second transmission connecting shaft block 71 extends out of the sleeve 7 and is connected to the transmission universal joint 6; a first transmission connecting shaft block 41 and a transmission shaft 43 are rotatably arranged in the rotating drum 4, one end of the first transmission connecting shaft block 41 extends out of the rotating drum 4 and is connected to the second transmission connecting shaft block 71 through the transmission universal joint 6, and the other end is fixedly connected to the transmission shaft 43 in the rotating drum 4, and the other end of the transmission shaft 43 is sleeved with a threaded block 44 that can rotate with the transmission shaft 43 and can slide along the transmission shaft 43, and the threaded block 44 is inserted into the clamping assembly; the clamping assembly includes a fixed block 1, a gear 14, a rotating shaft 13, a clamping block connecting block 2 and a clamping block 3, and the fixed block 1 is centrally provided with a There is a cavity that can accommodate two gears 14, the two gears 14 are symmetrically arranged in the cavity and leave a central position, the threaded block 44 is inserted into the center of the cavity of the fixed block 1 and meshes with the two gears 14, the gear 14 is rotatably connected to the fixed block 1 through the rotating shaft 13, the gear 14 is fixedly connected to the rotating shaft 13, and each gear 14 is provided with a rotating connecting plate 11 on both sides, one end of the rotating connecting plate 11 is fixedly connected to the rotating shaft 13, and the other end is rotatably connected to the clamping block connecting block 2; a driven connecting plate 12 is also provided between the fixed block 1 and the clamping block connecting block 2, and the two ends of the driven connecting plate 12 are respectively rotatably connected to the fixed block 1 and the clamping block connecting block 2, and the fixed block 1, the rotating connecting plate 11, the clamping block connecting block 2 and the driven connecting plate 12 together constitute a parallelogram structure; the clamping block connecting block 2 and the clamping block 3 are detachably connected by bolts and gaskets 21; the fixed block 1 is also provided with a nut block 15 that matches the threaded block 44, and one end of the threaded block 44 is threadedly connected in the nut block 15.

[0031] The transmission shaft 43 is provided with a slider 432, and the threaded block 44 is provided with an axial slide groove 441, and the slider 432 cooperates with the slide groove 441. The slider 432 is detachably mounted on the transmission shaft 43, and the transmission shaft 43 is provided with a slider plug hole 431, and the slider 432 is plugged into the slider plug hole 431.

[0032] The rotating drum 4 is fixedly connected to the fixed block 1 via a connecting plate 5 . The connecting plate 5 includes a horizontal plate 51 and a vertical plate 52 . The horizontal plate 51 is fixedly connected to the fixed block 1 , and the vertical plate 52 is fixedly connected to the rotating drum 4 .

[0033] A transmission shaft head 411 is disposed at one end of the first transmission connection shaft block 41 close to the transmission shaft 43 , and the transmission shaft 43 is fixedly connected to the transmission shaft head 411 .

[0034] A first bearing 42 is provided between the transmission shaft 43 and the drum 4. The transmission shaft 43 is inserted into the first bearing 42. One end of the transmission shaft 43 extends into the drum 4 and is fixedly connected to the first transmission connecting shaft block 41, and the other end extends out of the drum 4 and is transmission-connected to the threaded block 44.

[0035] The transmission universal joint 6 includes two sets of connection joints 61, and the two sets of connection joints 61 are respectively connected to the first transmission connection shaft block 41 and the second transmission connection shaft block 71, and a cross universal joint 62 is provided at the connection between the two sets of connection joints 61 and the first transmission connection shaft block 41 and the second transmission connection shaft block 71.

[0036] A folding device 8 is connected between the sleeve 7 and the rotating drum 4, and the folding device 8 includes a fixed ring 81 and a rotating ring 82. The fixed ring 81 is sleeved on the outside of the sleeve 7 and fixedly connected to the sleeve 7, and the rotating ring 82 is sleeved on the outside of the rotating drum 4 and is rotatably connected through a second bearing 822; a first folding connecting plate 811 is provided on the fixed ring 81, and a second folding connecting plate 821 is provided on the rotating ring 82. The first folding connecting plate 811 and the second folding connecting plate 821 are connected by a hinge 83.

[0037] The fixing block 1 is used to connect the various accessories of the clamp, and the clamp block connecting block 2 is connected to the clamp block 3, and the clamp block 3 clamps the workpiece, and the clamp block 3 can be replaced according to the shape of the workpiece. The clamp block 3 is installed or disassembled by bolts and gaskets 21. The rotating cylinder 4 is the rotating and transmission part of the clamp, the sleeve 7 is used to connect to the machine or be hand-held, and can protect the active transmission part, and the transmission angle conversion is completed by the transmission universal joint 6.

[0038] When in use, the clamping direction is adjusted by rotating the rotating drum 4 in the rotating sleeve ring 82. After the clamping direction is adjusted, its rotation is limited by manual fixing or damping parts, and then the connection angle of the sleeve 7 is adjusted according to the machine tool used and the processing environment. The sleeve 7 rotates on the connecting joint 61 through the second transmission connecting shaft block 71 to complete the bending of the sleeve 7, and the auxiliary folding and the fixing of the folding angle are completed through the folding device 8. During the bending process of the sleeve 7, the hinge 83 is driven to rotate through the fixed sleeve ring 81 and the first folding connecting plate 811 connected to it, thereby changing the angle between the sleeve 7 and the fixed block 1 and the clamping assembly connected to it, and it can be connected to the machine tool that needs to be fixed through the first folding connecting plate 811 and the second folding connecting plate 821, so as to fix the position and angle of the entire self-locking mechanical clamp, and the position and direction of the fixed block 1 and the various clamp assemblies connected to it can be changed by rotating the rotating drum 4 in the rotating sleeve ring 82;

[0039] After the mechanical fixture is adjusted and installed, the workpiece can be clamped, and the driving shaft 9 is connected to the motor or the handle. The driving shaft 9 is rotated by the motor or manually, which in turn drives the second transmission connecting shaft block 71, the transmission universal joint 6, the first transmission connecting shaft block 41, and the transmission shaft 43 to rotate. The rotation of the transmission shaft 43 drives the threaded block 44 to rotate, and the rotation of the threaded block 44 drives the gear 14 to rotate. The gear 14 drives the rotating shaft 13 and the rotating connecting plate 11 to swing. The parallelogram structure composed of the fixed block 1, the rotating connecting plate 11, the clamping block connecting block 2 and the driven connecting plate 12 can make the clamping block connecting block 2 translate more stably, so that the two symmetrically arranged clamping block connecting blocks 2 are close to or away from each other, so that the two clamping blocks 3 clamp or release the workpiece. Since the threaded block 44 rotates in the nut block 15, the workpiece can be self-locked for a long time after clamping.

[0040] The embodiments of the present invention are given for the purpose of illustration and description, and are not intended to be exhaustive or to limit the invention to the disclosed forms. Many modifications and variations will be apparent to those of ordinary skill in the art. The embodiments are selected and described in order to better illustrate the principles and practical applications of the present invention and to enable those of ordinary skill in the art to understand the present invention and thereby design various implementations with various modifications suitable for specific uses.

Claims

1. A self-locking mechanical clamp, characterized in that: It includes a transmission assembly and a clamping assembly; The transmission assembly comprises a sleeve (7), a transmission universal joint (6) and a rotating drum (4); A driving shaft (9) and a second transmission connection shaft block (71) are rotatably arranged in the sleeve (7); one end of the driving shaft (9) is a power input end, and the other end is fixedly connected to the second transmission connection shaft block (71); the second transmission connection shaft block (71) extends out of the sleeve (7) and is connected to the transmission universal joint (6); A first transmission connection shaft block (41) and a transmission shaft (43) are rotatably arranged in the rotating drum (4); one end of the first transmission connection shaft block (41) extends out of the rotating drum (4) and is connected to the second transmission connection shaft block (71) through a transmission universal joint (6); the other end is fixedly connected to the transmission shaft (43) in the rotating drum (4); the other end of the transmission shaft (43) is sleeved with a threaded block (44) that can rotate with the transmission shaft (43) and can slide axially along the transmission shaft (43); the threaded block (44) is inserted into a clamping assembly; The clamping assembly comprises a fixed block (1), a gear (14), a rotating shaft (13), a clamping block connecting block (2) and a clamping block (3); a cavity for accommodating two gears (14) is provided in the center of the fixed block (1); the two gears (14) are symmetrically arranged in the cavity and a central position is reserved; the threaded block (44) is inserted into the center of the cavity of the fixed block (1) and meshes with the two gears (14); the gear (14) is rotatably connected to the fixed block (1) via the rotating shaft (13); the gear (14) is fixedly connected to the rotating shaft (13); a rotating connecting plate (11) is provided on both sides of each gear (14); one end of the rotating connecting plate (11) is fixedly connected to the rotating shaft (13) and the other end is rotatably connected to the clamping block connecting block (2); A driven connecting plate (12) is also provided between the fixed block (1) and the clamping block connecting block (2), and two ends of the driven connecting plate (12) are rotatably connected to the fixed block (1) and the clamping block connecting block (2), respectively, and the fixed block (1), the rotating connecting plate (11), the clamping block connecting block (2) and the driven connecting plate (12) together form a parallelogram structure; The clamping block connecting block (2) is detachably connected to the clamping block (3); The fixing block (1) is also provided with a nut block (15) matched with the threaded block (44), and one end of the threaded block (44) is threadedly connected in the nut block (15).

2. A self-locking mechanical clamp according to claim 1, characterized in that: The transmission shaft (43) is provided with a sliding block (432), the threaded block (44) is provided with an axial sliding groove (441), and the sliding block (432) matches the sliding groove (441).

3. A self-locking mechanical clamp according to claim 2, characterized in that: The transmission shaft (43) is provided with a slider insertion hole (431), and the slider (432) is inserted into the slider insertion hole (431).

4. A self-locking mechanical clamp according to claim 1, characterized in that: The rotating drum (4) is fixedly connected to the fixed block (1) via a connecting plate (5); the connecting plate (5) comprises a transverse plate (51) and a vertical plate (52); the transverse plate (51) is fixedly connected to the fixed block (1), and the vertical plate (52) is fixedly connected to the rotating drum (4).

5. A self-locking mechanical clamp according to claim 1, characterized in that: A transmission shaft head (411) is provided at one end of the first transmission connection shaft block (41) close to the transmission shaft (43), and the transmission shaft (43) is fixedly connected to the transmission shaft head (411).

6. A self-locking mechanical clamp according to claim 1, characterized in that: A first bearing (42) is provided between the transmission shaft (43) and the rotating drum (4), the transmission shaft (43) is inserted into the first bearing (42), one end of the transmission shaft (43) extends into the rotating drum (4) and is fixedly connected to the first transmission connecting shaft block (41), and the other end extends out of the rotating drum (4) and is transmission-connected to the threaded block (44).

7. A self-locking mechanical clamp according to claim 1, characterized in that: The transmission universal joint (6) comprises two groups of connection joints (61), and the two groups of connection joints (61) are respectively connected to the first transmission connection shaft block (41) and the second transmission connection shaft block (71), and a cross universal joint (62) is provided at the connection between the two groups of connection joints (61) and the first transmission connection shaft block (41) and the second transmission connection shaft block (71).

8. A self-locking mechanical clamp according to claim 1, characterized in that: A folding device (8) is connected between the sleeve (7) and the rotating drum (4), and the folding device (8) comprises a fixed sleeve (81) and a rotating sleeve (82); the fixed sleeve (81) is sleeved on the outside of the sleeve (7) and is fixedly connected to the sleeve (7); the rotating sleeve (82) is sleeved on the outside of the rotating drum (4) and is rotatably connected via a second bearing (822); a first folding connecting plate (811) is provided on the fixed sleeve (81), and a second folding connecting plate (821) is provided on the rotating sleeve (82); the first folding connecting plate (811) and the second folding connecting plate (821) are connected via a hinge (83).

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