Tray clamp for positioning and automatic clamping and centering of high-precision double-speed chain

Abstract

In order to solve the problems of positioning precision and cost in the aspects of assembling, overturning, detecting, machining and the like of workpieces on a speed chain in the current production line in the circulation process, the invention provides a high-precision speed chain positioning automatic clamping and centering tray clamp which comprises an automatic clamping and centering device and a positioning device, the automatic clamping and centering device is arranged on the surface, and the positioning device is arranged on the surface of the automatic clamping and centering device. The device consists of a spring, a gear, a rack, a replaceable nylon clamping block, a guide shaft, a linear bearing, a linear bearing matching mounting block, a bearing seat fixing block and a fluctuation stop block, so that a workpiece is always in a clamped state in a speed chain conveying process; the positioning device is composed of a linear guide rail sliding block, a tray, a rotating shaft, a centering base, a clamp panel, a clamp bottom plate, a connecting plate, a clamp supporting plate and a clamp jacking plate, positioning of the whole clamp in the conveying process is achieved through hole sites of the tray, and a gear, a rack and a linear guide rail are symmetrical around the centering base, so that the positioning precision of a workpiece on a production line is greatly improved.

Description

Technical Field

[0001] The present invention relates to the field of double-speed chain pallet clamp transportation, and in particular to a pallet clamp which can ensure the positioning accuracy of workpieces after loading and unloading. Background Art

[0002] The double-speed chain conveyor line is a self-flowing production line widely used in assembly line equipment. It is used with pallets, has strong conveying capacity, is easy to realize accumulation and release conveying, and has reliable performance. However, during the double-speed chain conveying process, the workpiece needs to be assembled, flipped, inspected, processed, and other operations at the workstation. This requires the workpiece to have relatively high positioning accuracy and large automatic clamping capacity during the double-speed chain conveyor line. In order to solve the problems of poor positioning effect and inability to be applied to automated processing, it is necessary to develop a high-precision double-speed chain positioning and automatic clamping and centering pallet fixture. Summary of the Invention

[0003] To address the positioning accuracy and clamping force issues associated with workpiece assembly, turnover, inspection, and processing on double-speed chain conveyor lines, this invention provides a high-precision double-speed chain positioning and automatic clamping and centering pallet fixture. The invention primarily consists of an automatic clamping and centering section and a positioning section. These two components operate simultaneously, enabling the pallet fixture to meet the workpiece requirements of the production process. Its technical solution is as follows:

[0004] The present invention provides a high-precision double-speed chain positioning and automatic clamping and centering pallet fixture, which includes an automatic clamping and centering device and a positioning device. The automatic clamping and centering device is arranged on the surface and is composed of a spring, a gear, a rack, a replaceable nylon clamp, a guide shaft, a linear bearing, a linear bearing matching mounting block, a bearing seat fixing block, and a wave stop block, so that the workpiece is always in a clamped state during the double-speed chain transmission process; the positioning device is composed of a linear guide slider, a pallet, a rotary shaft, a centering seat, a fixture panel, a fixture bottom plate, a connecting plate, a fixture support plate, and a fixture lifting plate. First, the pallet of the positioning device is designed with a stop position that matches the stop cylinder and a pallet positioning hole that matches the lifting cylinder to ensure that the pallet fixture can stop at the ideal work position and has a high positioning accuracy in the direction of the double-speed chain conveying line; the fixture lifting plate is provided with a positioning pin that matches the pallet positioning and a supporting lifting support for positioning and lifting the pallet off the double-speed chain.

[0005] Furthermore, the center of the pallet is the fixture base plate, the pallet and the fixture base plate are connected by threads, the center of the fixture base plate is a centering seat for fixing the rotating shaft; the two sides are fixture support plates for supporting the upper automatic clamping and centering part.

[0006] Furthermore, the upper side of the rotary shaft is connected to a gear, which meshes with the racks on both sides to ensure that the opening and clamping of the fixture on both sides are synchronized, thereby ensuring the positioning accuracy when the pallet clamps the workpiece.

[0007] Furthermore, the rack, the guide rail slider, the linear bearing and the mounting block are connected together on a connecting plate, and the linear guide rail moves smoothly, accurately, is wear-resistant and can withstand large loads.

[0008] Furthermore, the workpiece is placed on the fixture panel, the fixture panel and the fixture support plate are connected by threads, the bearing fixing blocks are installed at both ends of the fixture panel, and the linear bearing matching mounting block and the connecting plate are connected by threads and suspended on the upper part of the fixture panel. The parallelism of the fixture in the vertical direction of the speed chain is ensured by the joint action of the guide shaft, linear bearing and linear guide rail.

[0009] Furthermore, the spring is placed between the bearing fixing block and the linear bearing matching mounting block and is always in a compressed state, providing clamping force to automatically clamp the workpiece; the replaceable nylon clamp block and the linear bearing matching mounting block are matched through threads.

[0010] Furthermore, the wave stopper, the linear bearing matching mounting block and the guide shaft are connected by threads, and there is a bearing fixing block between the two. The linear bearing is fixed on the bearing fixing block. There is a distance between the wave stopper and the bearing fixing block, which is used to cooperate with the clamp pulling part to achieve the pulling effect.

[0011] The present invention has the following beneficial effects:

[0012] When the clamp is actually used, it always clamps the workpiece during the double-speed chain transportation process, which can prevent the workpiece from deflecting.

[0013] In actual use, the fixture can clamp workpieces of various shapes by replacing the nylon clamping block, has very good centering performance, and its scope of application can be expanded.

[0014] When the clamp is actually used, the mechanical opening and clamping of the clamp at the work station has high stability and accuracy, high positioning precision and long service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is the external structure diagram of the pallet fixture with high-precision double-speed chain positioning and automatic clamping and centering.

[0016] Figure 2 It is a cross-sectional view of the top view of the present invention

[0017] Figure 3 This is the structural diagram of the fixture lifting plate in the present invention

[0018] Figure 4 The connecting piece diagram of the present invention

[0019] Figure 5 This is the clamp pull-out diagram of the present invention

[0020] In the accompanying drawings, the components represented by the reference numerals are as follows:

[0021] 1. Pallet; 2. Guide shaft; 3. Linear bearing mounting block; 4. Spring; 5. Bearing seat fixing block; 6. Wave stop block; 7. Linear bearing; 8. Interchangeable nylon clamp; 9. Fixture panel; 10. Fixture support plate; 11. Pallet positioning hole; 12. Fixture bottom plate; 13. Pallet stop position; 14. Centering seat; 15. Gear; 16. Linear guide rail; 161. Guide rail slider; 162. Connecting plate; 17. Rack; 18. Rotary shaft; 19. Locating pin; 20. Lifting support; 21. Fixture lifting plate; 22. Fixture pull-out piece DETAILED DESCRIPTION

[0022] The technical solutions of the specific implementation methods of the present invention are clearly and completely described below in conjunction with the accompanying drawings and examples, so as to provide further explanation of the present application.

[0023] With the continuous development of the economy, more and more production lines tend to be automated, and engineers have begun to have higher requirements for the fixtures on the production lines. The double-speed chain is widely used in the flow process of the production line, but the current fixtures used on the double-speed chain may have deviations in the positioning accuracy of the workpiece due to process reasons or the complexity of the workstations in the flow process. These deviations may affect the process effects of the workpiece during assembly, flipping, inspection, and processing, and may even damage the equipment. Moreover, due to the different external dimensions of the workpiece, the fixture may need to be manufactured in large quantities to adapt to the flow process, and this part of the cost is also a considerable expense. Therefore, improving compatibility to reduce the manufacturing cost of the double-speed chain fixture can effectively improve the efficiency of the production line.

[0024] In order to solve the positioning accuracy and cost problems of assembly, flipping, inspection, processing, etc. of workpieces on the double-speed chain in the current production line during the circulation process, the present invention provides a pallet fixture with high-precision double-speed chain positioning and automatic clamping and centering.

[0025] like Figure 1-5As shown, a high-precision double-speed chain positioning automatic clamping and centering pallet fixture includes a bottom pallet 1 for being placed on the double-speed chain conveyor line to cooperate with the conveying of workpieces. There are designed pallet positioning holes 11 and pallet stop positions 13 on the pallet 1. When the double-speed chain conveys the fixture to the expected position, the stop cylinder on the double-speed chain contacts the pallet stop position 13, and the pallet 1 stops moving. At this time, the fixture lifting plate 21 rises under the action of the cylinder. There is a height difference between the positioning pin 19 and the lifting support 20 on the fixture lifting plate. During the rising process, the positioning pin 19 enters the positioning hole 11, and then the lifting support 20 contacts the bottom position of the pallet 1; through the positioning of the pallet stop position 13 and the pallet positioning hole 11, the pallet fixture has higher precision positioning during the conveying process of the double-speed chain.

[0026] The fixture base plate 12 is placed at the center of the pallet, which not only plays a positioning role but also improves the supporting strength of the pallet 1; a centering seat 14 is placed at the center of the fixture base plate 12 for fixing the rotating shaft 18, and fixture support plates 10 are placed on both sides of the fixture base plate 12. The upper end of the support plate 10 is connected to the fixture panel 9 by a thread, and the lower end is connected to the fixture base plate 12 by a thread, which is used to support the fixture; the gear 15 is placed at the upper end of the rotating shaft 18 and meshes with the racks 17 on both sides. The meshing of the gear 15 and the rack 17 ensures the synchronization of the opening and closing stroke of the fixture, improves the centripetality of the fixture, and thereby improves the positioning accuracy of the fixture.

[0027] Two linear guide rails 16 are fixed on the fixture panel 9, and the guide rail slider 161, linear bearing matching mounting block 3 and rack 17 that cooperate with the linear guide rail 16 are fixed on the connecting plate 162, wherein the guide rail slider 161 and linear bearing matching mounting block 3 are fixed to the upper end of the connecting plate 162, and the rack 17 is fixed to the lower end of the connecting plate 162; in the present invention, four 80*14mm rectangular holes are opened on both sides of the fixture panel 9 for passing the mounting part of the linear bearing matching mounting block 3, wherein the mounting part of the linear bearing matching mounting block 3 has a thickness of 10mm; in this way, the linear bearing matching mounting block 3 and the replaceable nylon clamp 8 are in a suspended state on the fixture panel 9, so that the various components of the fixture can follow the movement of the linear guide rail 16 during the opening and closing stroke, thereby improving the stability and service life of the fixture.

[0028] The inner side of the linear bearing matching mounting block 3 is connected to the replaceable nylon clamp 8, and the outer side is connected to the guide shaft 2; the spring 4 is coiled on the guide shaft 2, and the spring 4 is compressed between the bearing seat fixing block 5 and the linear bearing matching mounting block 3; the guide shaft 2 passes through the linear bearing 7 on the bearing seat fixing block 5, and the end is connected to the wave stopper 6, and a distance is left between the wave stopper 6 and the bearing seat fixing block 5 for pulling the part 22 apart through the clamp; in this way, the clamp has clamping force regardless of whether it clamps the workpiece or not, the guide shaft 2 can assist the linear guide rail 16 in playing a guiding role, and automatic devices can be used on the production line to complete the opening and closing stroke.

[0029] When the clamp is actually used, the user places the clamp on the speed chain in advance, and then the clamp moves with the speed chain. The clamp pull-out piece 22 is connected to the normally open cylinder through a thread and is installed on both sides of the speed chain with the normally open cylinder. When the pallet 1 is lifted on the speed chain, the clamp pull-out piece 22 on both sides of the clamp retracts with the cylinder, and the clamp pull-out piece 22 drives the wave stopper 6, and then drives the linear bearing to cooperate with the mounting block 3, the replaceable nylon clamp 8, the guide rail slider 161, and the rack 17 to move synchronously to both sides under the action of the gear 15, and the clamp completes the opening stroke and completes the loading and unloading process; then the cylinder extends, and the elastic force of the spring 4 causes the linear bearing to cooperate with the mounting block 3 and the replaceable nylon clamp 8 to reset, and then drives the wave stopper 6, the guide rail slider 161, and the rack 17 to reset synchronously to the center of the clamp under the action of the gear 15.

[0030] When the fixture is actually used, the workpiece is already in a clamped state. When the workpiece needs to be tightened and assembled, normally closed cylinders are installed on both sides. When the pallet 1 is lifted on the speed chain, the cylinders on both sides of the fixture are pushed out to contact the wave stopper 6 and apply a clamping force, so that the clamping force on the workpiece is increased, and the process is completed while ensuring the positioning accuracy; when it is necessary to perform drilling processing on the workpiece, a normally closed cylinder can be placed on the upper part of the fixture. When the pallet 1 is lifted on the speed chain, the cylinder on the upper part of the workpiece is extended to apply a thrust to the workpiece, and the workpiece is in a completely clamped state through the clamping force of the upper and lower cylinders and the clamping force of the spring, thus ensuring the positioning accuracy and completing the processing procedure.

[0031] The above description is merely a preferred embodiment of the present application and is not intended to limit the present application. Various modifications and variations are possible for those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present application shall be included within the scope of protection of the present application.

Claims

1. A high-precision pallet clamp for positioning and automatically clamping the centering of a double-speed chain, characterized by: include: Positioning mechanism: an automatic clamping and centering mechanism is installed on the upper part of the positioning mechanism; The positioning mechanism includes: a linear guide slider, a tray, a rotary shaft, a centering seat, a fixture panel, a fixture bottom plate, a connecting plate, and a fixture lifting plate; The automatic clamping and centering mechanism comprises: a spring, a gear, a rack, a replaceable nylon clamping block, a guide shaft, a linear bearing, a linear bearing matching mounting block, a bearing seat fixing block, and a wave stopper.

2. The high-precision speed chain positioning and automatic clamping and centering pallet fixture according to claim 1 is characterized in that The pallet is designed with two diagonal positioning holes that match the clearance of the positioning pins of the fixture lifting plate to improve the positioning accuracy of the pallet during its movement on the speed chain.

3. The high-precision double-speed chain positioning and automatic clamping and centering pallet fixture according to claim 1 is characterized in that The rotation of the gear and the meshing of the racks on both sides ensure the synchronization of the automatic clamping and centering mechanism during the opening and closing stroke of the fixture, thereby improving the centering performance of the fixture.

4. The high-precision speed chain positioning and automatic clamping and centering pallet fixture according to claim 1 is characterized in that Two linear guide rails are slidably installed, and each guide rail has two sliders for automatically clamping and centering the mechanism so that it moves along the direction of the guide rail during the opening and closing stroke of the fixture.

5. The high-precision double-speed chain positioning and automatic clamping and centering pallet fixture according to claim 1 is characterized in that Four springs that are always in a compressed state are coiled around the four guide shafts to provide clamping force, so that the fixture is in a clamped state when there is a workpiece on it.

6. The high-precision speed chain positioning and automatic clamping and centering pallet fixture according to claim 1 is characterized in that The fixture panel has four 80*14mm rectangular holes. The linear bearing, mounting block and replaceable nylon clamp block have no contact with the fixture panel. The replaceable nylon clamp block can be replaced according to the shape of the workpiece, and the nylon material has a certain buffering effect when the fixture is clamped.

7. The high-precision double-speed chain positioning and automatic clamping and centering pallet fixture according to claim 1 is characterized in that The center distance between the guide shafts on both sides is 50mm. When the clamp is opened, there is a distance between the clamp and the clamp pull-out piece that can reach a position slightly below the center of the guide shaft.

8. The high-precision speed chain positioning and automatic clamping and centering pallet fixture according to claim 1 is characterized in that The guide shaft serves as a connecting piece to connect the wave stopper and the linear bearing matching mounting block, and passes through the linear bearing on the bearing seat fixing block.

9. The high-precision speed chain positioning and automatic clamping and centering pallet fixture according to claim 1 is characterized in that The rack, the guide rail slider, the linear bearing and the mounting block are connected on the same connecting piece.

10. The high-precision double-speed chain positioning and automatic clamping and centering pallet clamp according to claim 1 is characterized in that The centering seat of the rotary shaft is fixed on the fixture bottom plate, and the fixture bottom plate can strengthen the supporting effect of the pallet.

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