A motion control device for a clamp

Abstract

The present invention discloses a motion control device for a clamp, which is used to control the movement of a pair of clamp arms installed on both sides of a frame and clamp plates installed at the bottom of the two clamp arms, respectively, and includes a translation drive mechanism and a synchronization component; the translation drive mechanism is used to push the clamp arms to move on the frame, and includes a hydraulic cylinder, and the two ends of the hydraulic cylinder are respectively connected to the frame and the clamp arms. The motion control device for the clamp of the present invention pushes the clamp arms to move relatively on the frame through the hydraulic cylinder, and at the same time cooperates with the synchronization component to control the clamp arms and the clamp plates, so that the clamp has a high degree of freedom while ensuring the clamping efficiency of the brick blank, and minimizes the damage to the brick blank caused by careless clamping.

Description

Technical Field

[0001] The present invention relates to the technical field of clamps, and in particular to a motion control device for a clamp. Background Art

[0002] A fixture is an object used to fix the object to be processed during the mechanical manufacturing process so that it occupies the correct position for construction or inspection. In the production of construction and building materials, concrete brick blanks (also called concrete block blanks) are heavy. When moving and transporting them during the processing process, a crane or forklift equipped with a fixture is required to fix and move them.

[0003] Existing concrete brick hoisting fixtures generally use two clamping plates for hydraulic clamping, which can effectively fix the bricks, but they usually only have one-way freedom in the clamping direction, that is, the two clamping plates are separated and moved to the two sides of the bricks under the drive of the crane and then clamped together. In the face of bricks of different specifications, it is necessary to frequently replace the clamping plates and adjust the direction of the bricks, which greatly reduces the efficiency of the fixture. Therefore, the demand for hoisting fixtures with high degrees of freedom and multi-angle changes is increasing. Clamps with higher flexibility often require complex and stable control devices. In order to reduce the damage to the bricks when the clamps are clamped, the clamps on both sides also need to maintain great synchronization, which further increases the complexity of the control device and increases the production cost of the fixture.

[0004] Therefore, in view of the above-mentioned technical problems, it is necessary to provide a new technical solution. Summary of the invention

[0005] The object of the present invention is to provide a motion control device for a clamp which has higher structural stability, stronger synchronization, simplified structure and is easy to manufacture.

[0006] In order to solve the above technical problems, the present invention provides a motion control device for a clamp, and the specific technical solution is as follows:

[0007] A motion control device for a clamp is used to control the movement of a pair of clamp arms installed on both sides of a frame and clamp plates installed at the bottom of the two clamp arms respectively, comprising a translation drive mechanism and a synchronization component; the translation drive mechanism is used to push the clamp arms to move on the frame, comprising a hydraulic cylinder, and both ends of the hydraulic cylinder are respectively connected to the frame and the clamp arms; the clamp plates are adjustable in length, and the synchronization component comprises a first synchronization mechanism for controlling the synchronous reverse movement of the clamp arms and a second synchronization mechanism for synchronously adjusting the two clamp plates, the first synchronization mechanism is installed on the frame, and the second synchronization mechanism is installed between the two clamp arms.

[0008] Preferably, the clamping arm includes two parallel side plates and multiple cross beams connected between the side plates, the cross beams are located below the plane where the frame is located and there is a gap to prevent interference during movement, the frame is provided with channel steels on both sides close to the side plates, and rollers adapted to the channel steels are provided on the inner side of the side plates, and the two clamping arms move in opposite directions along the channel steels through the rollers.

[0009] Preferably, a first connecting plate is hingedly connected to one end of the hydraulic cylinder, and a second connecting plate is hingedly connected to the other end thereof, the first connecting plate is connected and fixed to the crossbeam, and the second connecting plate is connected and fixed to the frame.

[0010] Preferably, the clamp arm further comprises a mounting seat for mounting the clamp plate, a plurality of pull rods are provided between the mounting seat and the clamp arm, one end of the pull rod is connected and fixed to the mounting seat, and the other end is hinged to the clamp arm.

[0011] Preferably, the first synchronization mechanism includes a rocker arm arranged parallel to the side plate, a first connecting rod is provided at each end of the rocker arm, the two first connecting rods are symmetrically arranged around the center of the rocker arm, one end of the first connecting rod is hinged to the rocker arm, and the other end is hinged to the clamping arm.

[0012] Preferably, there are two rocker arms symmetrically arranged on both sides of the frame, a connecting shaft is provided between the two rocker arms, the connecting shaft is rotatably mounted on the frame, and both ends of the connecting shaft are fixedly connected to the centers of the two rocker arms.

[0013] Preferably, the clamping plate comprises a main body fixed on a mounting seat and a moving part slidably connected to the mounting seat, and the second synchronization mechanism is used to control the synchronous movement of the moving parts at the bottom of the two clamping arms.

[0014] Preferably, the second synchronization mechanism includes a retractable synchronization shaft, which is rotatably connected to the two clamping arms, and second connecting rods are hinged at both ends of the synchronization shaft. The second connecting rod extends toward the clamping plate, and a screw rod is provided between the second connecting rod and the clamping plate, one end of the screw rod is hinged to the second connecting rod, and the other end is hinged to the moving part with a ball bearing.

[0015] Preferably, there are at least two moving parts, which are respectively located on both sides of the main body, and the moving parts on both sides of the main body move synchronously in opposite directions.

[0016] Preferably, the synchronization assembly further comprises a third synchronization mechanism, and the third synchronization mechanism is mounted on the mounting seat to control the synchronous movement of the moving parts on both sides of the main body.

[0017] The motion control device of a clamp of the present invention has the following beneficial effects:

[0018] The motion control device of the clamp of the present invention drives the clamp arm to move relatively on the frame through the hydraulic cylinder, and cooperates with the synchronous component to control the clamp arm and the clamp plate, so that the clamp has a high degree of freedom and ensures the clamping efficiency of the brick blank, which minimizes the damage of the brick blank caused by careless clamping. In addition, the synchronous component works with a reasonable and simple structure, which is more cost-effective and more conducive to production, and has higher working efficiency.

[0019] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solution of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. 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 these drawings without paying creative work.

[0021] Figure 1 It is a schematic diagram of the assembly of a motion control device for a fixture;

[0022] Figure 2 for Figure 1 Schematic diagram of the structure of the middle clamp arm;

[0023] Figure 3 for Figure 1 A schematic diagram of the structure of the translation drive mechanism;

[0024] Figure 4 for Figure 1 Schematic diagram of the structure of the synchronization component.

[0025] Among them, 1-frame; 11-channel steel; 2-clamp arm; 21-side plate; 22-crossbeam; 23-roller; 24-pull rod; 25-mounting seat; 26-clamp plate; 261-main body; 262-moving part; 3-translational drive mechanism; 31-hydraulic cylinder; 32-first connecting plate; 33-second connecting plate; 4-synchronizing assembly; 41-first synchronous mechanism; 411-rocker arm; 412-first connecting rod; 413-connecting shaft; 42-second synchronous mechanism; 421-synchronizing shaft; 422-second connecting rod; 423-screw; 43-third synchronous mechanism. DETAILED DESCRIPTION

[0026] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention. Example

[0027] See also Figures 1 to 4 A motion control device for a clamp is used to control the movement of a pair of clamp arms 2 installed on both sides of a frame 1 and clamp plates 26 respectively installed at the bottom of the two clamp arms, including a translation drive mechanism 3 and a synchronization component 4; the translation drive mechanism 3 is used to push the clamp arms to move on the frame, including a hydraulic cylinder 31, and the two ends of the hydraulic cylinder are respectively connected to the frame 1 and the clamp arms 2; the length of the clamp plates 26 is adjustable, and the synchronization component 4 includes a first synchronization mechanism 41 for controlling the synchronous reverse movement of the clamp arms and a second synchronization mechanism 42 for synchronously adjusting the two clamp plates, the first synchronization mechanism is installed on the frame, and the second synchronization mechanism is installed between the two clamp arms.

[0028] The clamping arm 2 includes two parallel side plates 21 and multiple cross beams 22 connected between the side plates. The cross beams are located below the plane where the frame is located and there is a gap to prevent interference during movement. Channel steels 11 are provided on both sides of the frame 1 close to the side plates, and rollers 23 adapted to the channel steels are provided on the inner side of the side plates. The two clamping arms move in opposite directions along the channel steels through the rollers.

[0029] A first connecting plate 32 is hingedly connected to one end of the hydraulic cylinder 31 , and a second connecting plate 33 is hingedly connected to the other end. The first connecting plate is fixedly connected to the cross beam, and the second connecting plate is fixedly connected to the frame.

[0030] The clamp arm 2 further comprises a mounting seat 25 for mounting a clamp plate 26. A plurality of pull rods 24 are provided between the mounting seat 25 and the clamp arm. One end of the pull rod is fixedly connected to the mounting seat, and the other end is hinged to the clamp arm.

[0031] The first synchronization mechanism 41 includes a rocker arm 411 arranged parallel to the side plate 21, with a first connecting rod 412 provided at each end of the rocker arm. The two first connecting rods are symmetrically arranged around the center of the rocker arm, and one end of the first connecting rod is hinged to the rocker arm, and the other end is hinged to the clamping arm.

[0032] There are two rocker arms 411 symmetrically arranged on both sides of the frame, and a connecting shaft 413 is arranged between the two rocker arms. The connecting shaft is rotatably mounted on the frame, and both ends of the connecting shaft are fixedly connected to the centers of the two rocker arms.

[0033] The clamping plate 26 includes a main body 261 fixed on the mounting seat 25 and a moving part 262 slidably connected to the mounting seat. The second synchronization mechanism 42 is used to control the synchronous movement of the moving parts at the bottom of the two clamping arms.

[0034] The second synchronization mechanism 42 includes a retractable synchronization shaft 421, which is rotatably connected to the two clamping arms, and a second connecting rod 422 is hinged at both ends of the synchronization shaft. The second connecting rod extends toward the clamping plate 26, and a screw 423 is provided between the second connecting rod and the clamping plate, one end of the screw is hinged to the second connecting rod, and the other end is hinged to the moving part 262 by a ball bearing. Since it is difficult to ensure the accuracy of the clamping force of the clamp when the clamp moves close to the clamping arm, a fine-tuning device is generally provided on the clamping arm to control the movement of the clamp. In this process, the clamping plate needs to be pushed to move relative to each other when the clamping arm is stationary, which will cause multi-angle torsional forces between the moving part and the screw, and between the pull rod and the clamping plate. Therefore, it is necessary to connect the pull rod to the clamping arm in a hinged manner and the screw to be connected by a ball bearing, which is a necessary anti-interference structure.

[0035] There are at least two moving parts 262 located at two sides of the main body 261 , respectively. The moving parts at two sides of the main body move synchronously in opposite directions.

[0036] The synchronization assembly 4 further includes a third synchronization mechanism 43 , which is mounted on the mounting seat 25 to control the synchronous movement of the moving parts on both sides of the main body.

[0037] The working principle of the motion control device of the clamp of this embodiment is that when the clamp is clamping the brick blank, the two clamp arms 2 are driven by the translation drive mechanism 3, and the roller 23 rotates in the channel steel 11 to drive the clamp arms to approach, so that the clamp plate 26 clamps the brick blank. In this process, in order to ensure the clamping effect and prevent the brick blank from being damaged, the synchronization component 4 is required to synchronize the movements of the various mechanisms. Among them, when the two clamp arms are approaching each other, the first synchronization mechanism 41 controls the two clamp arms to always maintain uniform and synchronous movement through the symmetrically arranged first connecting rod 412 connected by the rocker arm 411, so as to prevent the two clamp plates from approaching the brick blank and colliding and damaging the brick blank due to uneven speed. When the length change of the brick blank does not match the current clamp plate length, the length of the clamp plate is changed to adapt to the brick blank through the movement of the moving part 262 relative to the main body 261. In this process, the second synchronization mechanism 42 is connected to the moving parts on both sides to ensure that the moving distance of the moving parts on both sides is the same to ensure that the length of the clamp plates is the same, so as to prevent the uneven stress distribution when the brick blank is clamped due to different lengths of the clamp plates. When each single-sided clamp has multiple moving parts, in order to ensure the controllability of the clamp length adjustment, the third synchronization mechanism 43 is used to make the moving parts move synchronously.

[0038] The beneficial effects of the present invention are as follows: the clamping arm is pushed to move relative to the frame by the hydraulic cylinder, and the clamping arm and the clamping plate are controlled by the synchronization component, so that the clamp has a high degree of freedom while ensuring the clamping efficiency of the brick blank, minimizing the damage to the brick blank caused by careless clamping, and the synchronization component works with a reasonable and simple structure, which is lower in cost, more conducive to production, and higher in work efficiency.

[0039] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify and vary the above embodiments within the scope of the present invention.

Claims

1. A motion control device for a clamp, used to control the motion of a pair of clamp arms (2) mounted on both sides of a frame (1) and clamp plates (26) respectively mounted at the bottom of the two clamp arms, characterized in that: The invention comprises a translation drive mechanism (3) and a synchronization assembly (4); the translation drive mechanism (3) is used to push the clamping arm to move on the frame, and comprises a hydraulic cylinder (31), and the two ends of the hydraulic cylinder are respectively connected to the frame (1) and the clamping arm (2); the clamping plate (26) is adjustable in length, and the synchronization assembly (4) comprises a first synchronization mechanism (41) for controlling the synchronous reverse movement of the clamping arm and a second synchronization mechanism (42) for synchronously adjusting the two clamping plates, the first synchronization mechanism is installed on the frame, and the second synchronization mechanism is installed between the two clamping arms; The clamp arm (2) further comprises a mounting seat (25) for mounting the clamp plate (26), a plurality of pull rods (24) are provided between the mounting seat (25) and the clamp arm, one end of the pull rod is connected and fixed to the mounting seat, and the other end is hinged to the clamp arm; The clamping plate (26) comprises a main body (261) fixed on the mounting seat (25) and a moving part (262) slidably connected to the mounting seat, and the second synchronization mechanism (42) is used to control the synchronous movement of the moving parts at the bottom of the two clamping arms; The second synchronization mechanism (42) comprises a retractable synchronization shaft (421), the synchronization shaft being rotatably connected to the two clamping arms, second connecting rods (422) being hinged at both ends of the synchronization shaft, the second connecting rod extending toward the clamping plate (26), and a screw rod (423) being provided between the second connecting rod and the clamping plate, one end of the screw rod being hinged to the second connecting rod, and the other end being hinged to the moving part (262) via a ball bearing.

2. The motion control device of the clamp according to claim 1, characterized in that: The clamp arm (2) comprises two parallel side plates (21) and a plurality of cross beams (22) connected between the side plates. The cross beams are located below the plane where the frame is located and there is a gap to prevent interference during movement. The frame (1) is provided with channel steels (11) on both sides close to the side plates. The inner side of the side plates is provided with rollers (23) adapted to the channel steels. The two clamp arms move in opposite directions along the channel steels via the rollers.

3. The motion control device of the clamp according to claim 2, characterized in that: One end of the hydraulic cylinder (31) is hingedly connected to a first connecting plate (32), and the other end is hingedly connected to a second connecting plate (33); the first connecting plate is fixedly connected to the crossbeam, and the second connecting plate is fixedly connected to the frame.

4. The motion control device of the clamp according to claim 2, characterized in that: The first synchronization mechanism (41) comprises a rocker arm (411) arranged parallel to the side plate (21), with a first connecting rod (412) provided at each end of the rocker arm, the two first connecting rods being symmetrically arranged around the center of the rocker arm, one end of the first connecting rod being hinged to the rocker arm, and the other end being hinged to the clamping arm.

5. The motion control device of the clamp according to claim 4, characterized in that: There are two rocker arms (411) symmetrically arranged on both sides of the frame, a connecting shaft (413) is arranged between the two rocker arms, the connecting shaft is rotatably mounted on the frame, and both ends of the connecting shaft are connected and fixed to the centers of the two rocker arms.

6. The motion control device of the clamp according to claim 1, characterized in that: There are at least two moving parts (262) located on both sides of the main body (261), respectively, and the moving parts on both sides of the main body move synchronously in opposite directions.

7. The motion control device of the clamp according to claim 6, characterized in that: The synchronization assembly (4) further comprises a third synchronization mechanism (43), which is mounted on the mounting seat (25) to control the synchronous movement of the moving parts on both sides of the main body.

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