Rear tensioning device

Abstract

The utility model provides a rear tensioning device, which relates to the technical field of clamps, and comprises a lower disc, a circular groove is arranged at the center of the top of the lower disc, a tensioning mechanism is arranged between the inner surface walls of the circular groove, the tensioning mechanism comprises a three-jaw frame, three jaw parts of the three-jaw frame are respectively provided with an open groove, and the open grooves are communicated with the circular groove. And a connecting rod is fixedly connected between the inner surface walls of the open grooves through bolts, a pressing block is fixedly installed at the top of the connecting rod, and a connecting sleeve is fixedly connected to the center of the bottom of the three-jaw frame. During use, after the screw rod and the pull rod are pushed and pulled through the air cylinder on a machine tool, the pressing block and the pressing tongue can be driven to be close to or away from the cushion block through the three-jaw frame and the connecting rod, so that a bottom connecting lug of a to-be-machined workpiece is fixed and unfixed, the overall structure is simple, and operation is convenient. A workpiece can be disassembled, assembled and fixed by pushing and drawing the screw rod 108 through power provided by the air cylinder, the service life is prolonged, and the later maintenance cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of clamps, in particular to a rear tensioning device. Background Art

[0002] In daily machine tool processing, claw-disc clamps are often needed to clamp and fix shafts, sleeves, discs and other workpieces. They are also the most widely used machine tool processing fixture mechanisms in mechanical manufacturing and repair factories.

[0003] The existing claw plate clamp mainly converts rotational motion into linear motion to drive the clamping claw to clamp and fix the workpiece. However, the overall structure of the existing claw plate clamp is complex and the precision is high, which leads to certain disadvantages in the overall service life and subsequent maintenance of the claw plate clamp. Therefore, in response to the above problems, we propose a new type of post-tensioning device. Utility Model Content

[0004] The purpose of the utility model is to solve the problem in the prior art that the overall structure of the claw disc clamp is complex and the precision is high, which leads to certain disadvantages in the overall service life and subsequent maintenance of the claw disc clamp, and to propose a rear tensioning device.

[0005] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a rear tensioning device, including a lower plate, a circular groove is opened at the top center of the lower plate, a tensioning mechanism is arranged between the inner surface walls of the circular groove, the tensioning mechanism includes a three-claw frame, the three claws of the three-claw frame are all opened with grooves, a connecting rod is fixedly connected between the inner surface walls of the grooves by bolts, a pressure block is fixedly installed on the top of the connecting rod, a connecting sleeve is fixedly connected at the bottom center of the three-claw frame, and a pull rod is rotatably connected inside the connecting sleeve.

[0006] Preferably, the bottom end of the pull rod slides through the inner bottom of the connecting sleeve and extends downward, and the bottom end of the pull rod is fixedly connected with a screw rod.

[0007] Preferably, a plurality of elastic support rods are equidistantly connected to the top of the lower plate at a position outside the circular groove, and an upper plate is installed between the top ends of three of the elastic support rods.

[0008] Preferably, a plurality of sliding grooves are equidistantly formed on the top of the upper plate near the edge, and the outer surface of the connecting rod and the inner surface wall of the sliding groove are slidably fitted.

[0009] Preferably, a pressing tongue is provided at the bottom of the pressing block near one side edge, and the pressing block is located above the upper plate.

[0010] Preferably, a plurality of cushion blocks are equidistantly installed on the top of the upper plate, and the positions of the cushion blocks and the pressing blocks correspond to each other.

[0011] Preferably, a plurality of limit blocks are equidistantly and fixedly connected to the top of the upper plate, and the positions of the limit blocks and the cushion blocks are staggered.

[0012] Preferably, the top of the cushion block is rotatably connected to a limiting column, and the top end of the limiting column is spherical.

[0013] Preferably, a first externally threaded sleeve is installed on the outer surface of the lower plate near the upper portion, and a second externally threaded sleeve is installed on the outer surface of the upper plate near the lower portion.

[0014] Preferably, a bidirectional internally threaded sleeve is connected between the outer surfaces of the first externally threaded sleeve and the second externally threaded sleeve.

[0015] Compared with the prior art, the advantages and positive effects of the utility model are:

[0016] 1. In the utility model, when in use, after the screw rod and the pull rod are pushed and pulled by the cylinder on the machine tool, the pressure block and the pressure tongue can be driven to move closer to or away from the pad through the three-claw frame and the connecting rod, thereby completing the fixing and releasing of the connecting ear at the bottom of the workpiece to be processed. The overall structure is simple, and the workpiece can be disassembled and fixed by pushing and pulling the screw rod 108 with the power provided by the cylinder, thereby improving the service life and the subsequent maintenance cost.

[0017] 2. In the utility model, rotating the bidirectional internally threaded sleeve 52 can drive the first externally threaded sleeve 5 and the second externally threaded sleeve 51 to move closer to or farther from each other, thereby adjusting the distance between the upper plate 3 and the lower plate 2. When the distance between the upper plate 3 and the lower plate 2 changes, the distance between the pressure block 104 and the cushion block 41 will change accordingly, so that workpieces of different thicknesses can be clamped and fixed, thereby improving the versatility and practicality of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A three-dimensional diagram of a rear tensioning device is provided for the utility model;

[0019] Figure 2 Another perspective view of a rear tensioning device proposed by the utility model;

[0020] Figure 3 A cross-sectional view of a rear tensioning device is provided for the utility model;

[0021] Figure 4 A partial structural cross-sectional view of a rear tensioning device proposed by the utility model;

[0022] Figure 5 The utility model provides a structural schematic diagram of a tensioning mechanism of a rear tensioning device.

[0023] Legend: 1. Tensioning mechanism; 101. Three-claw frame; 102. Slot; 103. Connecting rod; 104. Pressure block; 105. Pressing tongue; 106. Connecting sleeve; 107. Pull rod; 108. Screw; 2. Lower plate; 21. Circular groove; 22. Elastic support rod; 3. Upper plate; 31. Sliding groove; 4. Limit block; 41. Spacer block; 42. Limit column; 5. First external threaded sleeve; 51. Second external threaded sleeve; 52. Bidirectional internal threaded sleeve. DETAILED DESCRIPTION

[0024] In order to more clearly understand the above-mentioned purpose, features and advantages of the utility model, the utility model is further described below in conjunction with the accompanying drawings and embodiments. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0025] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways than those described herein. Therefore, the present invention is not limited to the specific embodiments of the following disclosure.

[0026] Embodiment 1, as Figure 1-Figure 5 As shown, the utility model provides a rear tensioning device, including a lower plate 2, a circular groove 21 is opened at the top center of the lower plate 2, a tensioning mechanism 1 is arranged between the inner surface walls of the circular groove 21, the tensioning mechanism 1 includes a three-claw frame 101, three claws of the three-claw frame 101 are opened with slots 102, a connecting rod 103 is fixedly connected between the inner surface walls of the slots 102 by bolts, a pressure block 104 is fixedly installed on the top of the connecting rod 103, a connecting sleeve 106 is fixedly connected at the bottom center of the three-claw frame 101, a pull rod 107 is rotatably connected inside the connecting sleeve 106, the bottom end of the pull rod 107 slides through the inner bottom of the connecting sleeve 106 and extends to the bottom, the bottom end of the pull rod 107 is fixedly connected to a screw rod 108, and the lower plate 2 is located at the top of the circular groove 21 outside and is equidistantly connected with a plurality of elastic support rods 22, an upper plate 3 is installed between the tops of the three elastic support rods 22, a plurality of sliding grooves 31 are equidistantly provided at the top of the upper plate 3 near the edge, the outer surface of the connecting rod 103 and the inner surface wall of the sliding groove 31 are slidably fitted, a pressing tongue 105 is provided at the bottom of the pressing block 104 near one side edge, the pressing block 104 is located above the upper plate 3, a plurality of pads 41 are equidistantly installed on the top of the upper plate 3, the positions of the pads 41 and the pressing block 104 correspond, a plurality of limit blocks 4 are equidistantly fixedly connected to the top of the upper plate 3, the positions of the limit blocks 4 and the pads 41 are staggered, the top of the pads 41 is rotatably connected to the limit column 42, and the top of the limit column 42 is spherical.

[0027] The effect achieved by the entire embodiment 1 is that when the device is installed, the lower plate 2 and the machine tool are connected by bolts to fix the device. At the same time, the screw rod 108 and the cylinder telescopic head are connected to provide power for the device. When in use, the three-claw frame 101 can be pushed upward through the connecting sleeve 106 by pushing the screw rod 108 and the pull rod 107. At this time, the connecting rod 103 fixed in the claw groove 102 of the three-claw frame 101 will drive the pressure block 104 to move upward. At this time, a large gap is generated between the pressure block 104 and the cushion block 41. Subsequently, the connecting ear at the bottom of the circular workpiece to be processed is inserted between the cushion block 41 and the limit block 4 and rotated so that the connecting ear is placed on the top of the cushion block 41. When the connecting ear at the bottom of the circular workpiece is placed on the top of the cushion block 41, the limit column 42 in the cushion block 41 will pass through the mounting hole on the surface of the connecting ear, thereby making the workpiece to be processed unable to rotate. Finally, by pulling the screw rod The three-claw frame 101 can drive the three pressure blocks 104 to move downward when the pressure tongue 105 at the bottom of the pressure block 104 is against the connecting ear on the surface of the base of the workpiece to be processed. The removal method is opposite. The overall structure is simple. The workpiece can be disassembled and fixed by pushing and pulling the screw rod 108 with the power provided by the cylinder. The service life and later maintenance cost are improved. The circular groove 21 is mainly used to avoid the connecting sleeve 106. The elastic support rod 22 is mainly composed of a circular sleeve, a round rod and a spring. The structure is simple and is mainly used to limit the upper plate 3 and the lower plate 2 to prevent the two from rotating relative to each other. The sliding groove 31 is mainly used to avoid the connecting rod 103, and the connecting rod 103 passes through the sliding groove 31 and also plays a role in limiting the upper plate 3 and the tensioning mechanism 1. After the workpiece is fixed, the surface will fit with the limit block 4, which plays a role in limiting the workpiece to be processed.

[0028] Embodiment 2, as Figure 1-Figure 4 As shown, a first externally threaded sleeve 5 is installed near the upper portion of the outer surface of the lower plate 2, a second externally threaded sleeve 51 is installed near the lower portion of the outer surface of the upper plate 3, and a bidirectional internally threaded sleeve 52 is connected between the outer surfaces of the first externally threaded sleeve 5 and the second externally threaded sleeve 51.

[0029] The effect achieved by the entire embodiment 2 is that the threads on the surfaces of the first externally toothed threaded sleeve 5 and the second externally toothed threaded sleeve 51 are opposite, and mesh with the internal threads of the bidirectional internally toothed threaded sleeve 52. Therefore, rotating the bidirectional internally toothed threaded sleeve 52 can drive the first externally toothed threaded sleeve 5 and the second externally toothed threaded sleeve 51 to move closer to or farther from each other, thereby playing a role in adjusting the distance between the upper plate 3 and the lower plate 2. When the distance between the upper plate 3 and the lower plate 2 changes, the distance between the pressure block 104 and the cushion block 41 will change accordingly, so that workpieces of different thicknesses can be clamped and fixed, thereby improving the versatility and practicality of the device. When the distance between the upper plate 3 and the lower plate 2 changes, the length of the elastic support rod 22 between the two will adaptively expand and contract under the action of the internal spring.

[0030] Working principle: when in use, by pushing the screw rod 108 and the pull rod 107, the three-claw frame 101 can be pushed upward through the connecting sleeve 106. At this time, the connecting rod 103 fixed in the claw slot 102 of the three-claw frame 101 will drive the pressure block 104 to move upward. At this time, a large gap is generated between the pressure block 104 and the cushion block 41. Then, the connecting ear at the bottom of the circular workpiece to be processed is inserted between the cushion block 41 and the limit block 4 and rotated so that the connecting ear is placed on the top of the cushion block 41. When the connecting ear at the bottom of the circular workpiece is placed on the top of the cushion block 41, the limit column 42 in the cushion block 41 will pass through the mounting hole on the surface of the connecting ear, thereby preventing the workpiece to be processed from rotating. Finally, by pulling the screw rod 108 and the pull rod 107 and then cooperating with the three-claw frame 101, the workpiece can be brought The three pressing blocks 104 are moved downward, and the pressing tongue 105 at the bottom of the pressing block 104 is pressed against the connecting ear on the surface of the base of the workpiece to be processed to complete the fixation. The removal method is opposite. The overall structure is simple, and the workpiece can be disassembled and fixed by pushing and pulling the screw rod 108 with the power provided by the cylinder. The service life and the later maintenance cost are improved. In addition, rotating the bidirectional internal tooth threaded sleeve 52 can drive the first external tooth threaded sleeve 5 and the second external tooth threaded sleeve 51 to move closer to or away from each other, thereby playing a role in adjusting the distance between the upper plate 3 and the lower plate 2. When the distance between the upper plate 3 and the lower plate 2 changes, the distance between the pressing block 104 and the cushion block 41 will change accordingly, so that workpieces of different thicknesses can be clamped and fixed, thereby improving the versatility and practicality of the device.

[0031] The above description is only a preferred embodiment of the present invention and does not limit the present invention in other forms. Any technician familiar with the profession may use the technical content disclosed above to change or modify it into an equivalent embodiment with equivalent changes and apply it to other fields. However, any simple modification, equivalent change and modification made to the above embodiment based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still falls within the protection scope of the technical solution of the present invention.

Claims

1. A rear tensioning device, comprising a lower plate (2), characterized in that: A circular groove (21) is provided at the center of the top of the lower plate (2), and a tensioning mechanism (1) is provided between the inner surface walls of the circular groove (21); The tensioning mechanism (1) comprises a three-claw frame (101), wherein the three claws of the three-claw frame (101) are all provided with slots (102), a connecting rod (103) is fixedly connected between the inner surface walls of the slots (102) by bolts, a pressure block (104) is fixedly installed on the top of the connecting rod (103), a connecting sleeve (106) is fixedly connected at the bottom center of the three-claw frame (101), and a pull rod (107) is rotatably connected inside the connecting sleeve (106).

2. The rear tensioning device according to claim 1, characterized in that: The bottom end of the pull rod (107) slides through the inner bottom of the connecting sleeve (106) and extends downward, and the bottom end of the pull rod (107) is fixedly connected to a screw rod (108).

3. The rear tensioning device according to claim 2, characterized in that: A plurality of elastic support rods (22) are equidistantly connected to the top of the lower plate (2) at a position outside the circular groove (21), and an upper plate (3) is installed between the top ends of the three elastic support rods (22).

4. The rear tensioning device according to claim 3, characterized in that: A plurality of sliding grooves (31) are equidistantly provided on the top of the upper plate (3) near the edge, and the outer surface of the connecting rod (103) and the inner surface wall of the sliding groove (31) are slidably fitted.

5. The rear tensioning device according to claim 4, characterized in that: A pressing tongue (105) is provided at the bottom of the pressing block (104) near one side edge, and the pressing block (104) is located above the upper plate (3).

6. The rear tensioning device according to claim 5, characterized in that: A plurality of cushion blocks (41) are equidistantly mounted on the top of the upper plate (3), and the positions of the cushion blocks (41) and the pressing blocks (104) correspond to each other.

7. The rear tensioning device according to claim 6, characterized in that: A plurality of limit blocks (4) are fixedly connected to the top of the upper plate (3) at equal intervals, and the positions of the limit blocks (4) and the cushion blocks (41) are staggered.

8. The rear tensioning device according to claim 7, characterized in that: The top of the cushion block (41) is rotatably connected to a limiting column (42), and the top of the limiting column (42) is spherical.

9. The rear tensioning device according to claim 8, characterized in that: A first externally toothed threaded sleeve (5) is installed near the upper portion of the outer surface of the lower plate (2), and a second externally toothed threaded sleeve (51) is installed near the lower portion of the outer surface of the upper plate (3).

10. The rear tensioning device according to claim 9, characterized in that: A bidirectional internal tooth thread sleeve (52) is connected between the outer surfaces of the first external tooth thread sleeve (5) and the second external tooth thread sleeve (51).

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