Single-drive clamping device with bidirectional synchronous jacking structure

Abstract

The invention provides a single-drive clamping device with a bidirectional synchronous jacking and pressing structure, which comprises a supporting and assembling component, a driving component, a first transmission component, a first jacking and pressing component, a second jacking and pressing component and a second transmission component. Linear output of the driving cylinder is synchronously converted into jacking actions in the first direction and the second direction, bidirectional stress balance and accurate positioning of a workpiece in the clamping process are guaranteed, deviation is effectively prevented, the overall structural rigidity is good, the pressing head is provided with a spring buffer mechanism, the pressing head can adapt to the dimensional tolerance of the workpiece, absorb impact and protect the workpiece and the device, and the working efficiency is improved. Complex control and coordination requirements of multiple driving elements are omitted, cost and maintenance difficulty are reduced, meanwhile, modular design is convenient to install and expand, and the device is suitable for various industrial scenes such as automatic assembly and clamp machining and has reliability, adaptability and economical efficiency.

Description

TECHNICAL FIELD

[0001] The present application relates to a clamp, in particular to a single drive clamping device with a bidirectional synchronous pressing structure. BACKGROUND

[0002] In modern precision machinery manufacturing, automobile parts processing and aerospace parts assembly, the positioning and clamping of workpieces is the primary link to ensure machining accuracy. According to the six-point positioning principle, the workpiece usually needs to be limited in six degrees of freedom. In actual operation, the most common clamping method is the 3-2-1 positioning method, which requires the clamp to be able to provide vertical pressing force to resist the main cutting force, and to provide horizontal clamping force to make the workpiece tightly adhere to the lateral positioning reference.

[0003] In the prior art, the devices that realize the above-mentioned bidirectional clamping function mainly exist in the following technical routes, but all have obvious defects: 1. Independent drive combined scheme: This is the most traditional solution, that is, a set of vertically installed air cylinders or oil cylinders are used to drive the pressing plate for vertical pressing, and another set of horizontally installed air cylinders or oil cylinders are used for lateral clamping.

[0004] Defect one: large space occupation. This scheme needs to arrange two independent drive units and their supporting pipelines, solenoid valves and sensors. For the precision machine tool workbench or multi-station rotary workbench with extremely limited space, such a large volume often cannot meet the needs of high-density arrangement.

[0005] Defect two: complex and unreliable synchronization control. The action sequence of the two independent cylinders must be coordinated through an external control system or a complex hydraulic sequence valve. If the lateral cylinder acts too fast, the workpiece may be clamped laterally before it is completely seated on the bottom surface positioning block, resulting in a suspended workpiece and serious machining thickness error. Conversely, if the vertical cylinder acts first, the lateral positioning reference may be lost. Although the speed can be adjusted by a throttle valve, the compressibility of gas and the viscosity variation of hydraulic oil make it very difficult to maintain strict synchronization for a long time.

[0006] Single-function inclined wedge clamping mechanism: There are a large number of inclined wedge clamps in the prior art, such as the utility model patent with publication number CN201763282U, and the standard product of German Gressel and American JW Winco companies. These mechanisms usually use bolts to tighten or a single cylinder to pull the wedge block to drive the jaw to move horizontally.

[0007] Defects: This kind of standard wedge clamp usually only provides single direction (usually horizontal direction) clamping force. If vertical pressing is needed, additional pressing plate mechanism is still needed. Although some designs produce a small amount of vertical component force through the special geometry of the jaw, this component force is often small and insufficient to resist the upward force when heavy cutting, and cannot adapt to workpieces with large height tolerance.

[0008] Complex linkage mechanism: A multi-directional clamping device as proposed in US11759901B2 uses a complex linkage system to achieve force redirection.

[0009] Defects: The more hinge points of the linkage mechanism, the greater the cumulative error, and the worse the rigidity of the system. In the vibration environment generated by heavy cutting, multiple hinge points are prone to wear and generate gaps, resulting in attenuation of clamping force. In addition, the complex linkage mechanism results in high manufacturing cost and difficult maintenance.

[0010] Reset failure problem: In the clamp using inclined surface transmission, after the driving force is removed, the mechanism often cannot reset by its own gravity due to the friction between the contact surfaces. In existing designs, although springs are often used for resetting, the springs of many designs are exposed and are easily jammed by sharp iron filings generated by machining, or corroded by corrosive coolant, causing breakage, thereby causing fixture failure and seriously affecting the operation rate of the automated production line.

[0011] In summary, there is a lack of a clamping mechanism with high structural compactness, which can achieve strict synchronous bidirectional large clamping force with only a single driving source, and has high reliability and fully enclosed reset function. SUMMARY

[0012] The purpose of the present application is to provide a single-drive clamping device with a bidirectional synchronous pressing structure.

[0013] The technical scheme adopted by the present application to solve its technical problems is: A single-drive clamping device with a bidirectional synchronous pressing structure, comprising: a support assembly having an assembly space therein; a drive assembly installed in the support assembly and operable in the support assembly, having a power output end that can reciprocate in a first direction; Further comprising: a first transmission assembly installed in the support assembly and cooperating with the power output end of the drive assembly, driven by the drive assembly to actuate the first transmission assembly; the first transmission assembly comprises a transmission stand having a driving inclined surface formed at an angle with the first direction; A first pressing assembly is installed in the first transmission assembly and is driven by the first transmission assembly to move along a first direction, so that the first pressing assembly can perform a pressing operation on the workpiece along the first direction; A second pressing assembly is installed in the support assembly and can move reciprocally along a second direction in the support assembly; the second pressing assembly comprises a second pressing head, an inner end of which is provided with a passive slope surface that abuts against the active slope surface; when the transmission column moves along the first direction, the passive slope surface is pushed by the active slope surface, so that the second pressing head is driven to extend and retract along the second direction, thereby performing a pressing operation on the workpiece along the second direction; The first direction is perpendicular to the second direction.

[0014] The support assembly comprises: A support base having a reference surface for assembly positioning; An assembly column installed in the support base and extending outward along the first direction.

[0015] The drive assembly comprises: A drive cylinder installed in the support base, with a power output shaft extending along the first direction.

[0016] The drive assembly is a pneumatic cylinder, a hydraulic cylinder or a servo electric push rod.

[0017] The first transmission assembly comprises: A transmission column engaged with the power output end of the drive assembly and extending along the first direction, so that the drive assembly drives the transmission column to move reciprocally along the first direction; A transmission beam hinged to the end of the transmission column and capable of swinging with the transmission column; A transmission link hinged to the middle of the transmission beam at one end and to the end of the assembly column at the other end, and capable of swinging with the transmission beam.

[0018] The first pressing assembly comprises: A first pressing seat installed at the end of the transmission beam and capable of moving reciprocally along the first direction when the transmission beam swings, and having a first guide hole extending along the first direction formed therein; A first pressing head, an inner end of which is arranged in the first guide hole and an outer end of which extends toward the workpiece, so that the first pressing head can move reciprocally along the first direction with the first pressing seat and can extend and retract along the first direction in the first guide hole, thereby performing a pressing operation on the workpiece along the first direction.

[0019] The second pressing assembly comprises: The second pressing head extends along the second direction, is arranged in the second guide hole of the vertical frame, is arranged in the second guide hole, can extend and retract in the second guide hole along the second direction, the inner end is matched with the driving slope, and the outer end extends to the workpiece direction.

[0020] The first pressing assembly further comprises: The first shoulder is arranged on the outer end side wall of the first pressing head. The first compression spring is sleeved on the outside of the first pressing head, one end of the first compression spring is abutted with the first shoulder, and the other end of the first compression spring is abutted with the first guide hole, and the first compression spring applies an elastic restoring force extending along the first direction to the first pressing head.

[0021] The second pressing assembly further comprises: The second shoulder is arranged on the inner end side wall of the second pressing head. The second compression spring is sleeved on the outside of the second pressing head, one end of the second compression spring is abutted with the second shoulder, and the other end of the second compression spring is abutted with the second guide hole, and the second compression spring applies an elastic restoring force extending along the second direction to the second pressing head.

[0022] The advantages of the present application are: The clamping device adopts a mechanical slope linkage mechanism to synchronously convert the linear output of the driving cylinder into pressing actions in the first direction and the second direction, ensures that the workpiece is balanced in two-way stress during clamping, accurate positioning, effectively prevents deviation, the overall structure is rigid, the pressing head is provided with a spring buffer mechanism, can adapt to the size tolerance of the workpiece and absorb impact, protects the workpiece and the device, saves the complex control and coordination demand of multiple driving elements, reduces the cost and maintenance difficulty, at the same time, the modular design is convenient for installation and expansion, is suitable for various industrial scenes such as automatic assembly, machining clamp, has reliability, adaptability and economy. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 It is a structure diagram of a single driving clamping device with a bidirectional synchronous pressing structure provided by the present application. Figure 2 It is an exploded view of the clamping device. DETAILED DESCRIPTION

[0024] In order to make the purposes, technical solutions, and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are some but not all of the embodiments of the present application. The components of the embodiments of the present application described and shown in the drawings herein can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but merely represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the scope of protection of the present application.

[0025] As shown in Figure 1 , Figure 2 The single-drive clamping device with bidirectional synchronous top pressing structure provided by the present application comprises a support assembly component, a driving component, a first transmission component, a first top pressing component, a second top pressing component, and a second transmission component. The support assembly component has an assembly space. The driving component is installed in the support assembly component and can operate in the support assembly component. The driving component has a power output end that can reciprocate in a first direction. The first transmission component is installed in the support assembly component and cooperates with the power output end of the driving component. The first transmission component is driven by the driving component to move. The first top pressing component is installed in the first transmission component and is driven by the first transmission component to move in the first direction, so that the first top pressing component can perform a top pressing operation on a workpiece in the first direction. The second top pressing component is installed in the support assembly component and can reciprocate in a second direction in the support assembly component. The second transmission component is installed between the second top pressing component and the first transmission component. When the first transmission component moves, the second top pressing component can be driven by the second transmission component to reciprocate in the second direction, so that the second top pressing component can perform a top pressing operation on the workpiece in the second direction.

[0026] In the present embodiment, the support assembly component comprises a support base 110 and an assembly stand 120. The support base has a reference surface for assembly positioning. The assembly stand is installed in the support base and extends outward from the support base in the first direction.

[0027] The driving component comprises a driving cylinder base 200. The driving cylinder base is installed in the support base, and a power output shaft of the driving cylinder base extends in the first direction.

[0028] The driving component is implemented by a pneumatic cylinder, a hydraulic cylinder, or a servo electric push rod.

[0029] The first transmission assembly comprises a transmission upright 310, a transmission beam 320 and a transmission link 330. The transmission upright is engaged with the power output end of the driving assembly and extends in the first direction. The transmission upright is driven by the driving assembly to reciprocate in the first direction. The transmission beam is hingedly connected to the end of the transmission upright and can swing with the transmission upright. The transmission link is hingedly connected to the middle of the transmission beam at one end and to the end of the assembly upright at the other end, and can swing with the transmission beam.

[0030] The first pressing assembly comprises a first pressing seat 410 and a first pressing head 420. The first pressing seat is mounted on the end of the transmission beam and can reciprocate in the first direction when the transmission beam swings. A first guide hole is formed in the first pressing seat and extends in the first direction. The inner end of the first pressing head is arranged in the first guide hole and the outer end thereof extends towards the workpiece and reciprocates in the first direction in the first guide hole. The first pressing head is used to press the workpiece in the first direction. In this embodiment, the first pressing assembly further comprises a first shoulder and a first compression spring. The first shoulder is formed on the side wall of the outer end of the first pressing head. The first compression spring is sleeved on the outside of the first pressing head, one end of which is in abutment with the first shoulder and the other end is in abutment with the first guide hole. The first compression spring applies an elastic restoring force to the first pressing head in the first direction, and the first shoulder shields the first compression spring in the first guide hole.

[0031] The second pressing assembly comprises a second pressing head 500. The second pressing head extends in the second direction. A second guide hole is formed in the assembly upright and extends in the second direction. The second pressing head is arranged in the second guide hole and can reciprocate in the second direction in the second guide hole. The inner end of the second pressing head cooperates with the second transmission assembly, and the outer end thereof extends towards the workpiece and is used to press the workpiece in the second direction. In this embodiment, the second pressing assembly further comprises a second shoulder and a second compression spring. The second shoulder is formed on the side wall of the inner end of the second pressing head. The second compression spring is sleeved on the outside of the second pressing head, one end of which is in abutment with the second shoulder and the other end is in abutment with the second guide hole. The second compression spring applies an elastic restoring force to the second pressing head in the second direction, and the second shoulder shields the second compression spring in the second guide hole.

[0032] The second transmission assembly comprises a driving slope 610 and a driven slope 620. The driving slope is formed on the side of the transmission upright and forms an angle with the first direction. The driven slope is formed on the inner end of the second pressing head and is in abutment with the driving slope. When the transmission upright moves in the first direction, the second pressing head is driven by the driven slope and the driving slope to reciprocate in the second direction.

[0033] The clamping device can synchronously drive the first and second pressing assemblies by one driving cylinder, so as to reduce the number of power elements, the cost and the maintenance complexity. The first pressing assembly moves along the first direction, and the second pressing assembly moves along the second direction at the same time, so that the workpiece is clamped in two directions, and the workpiece is prevented from deviating in the clamping process. The linear motion in the first direction is converted into the pressing motion in the second direction through the cooperation of the active slope and the passive slope, so that the two-way synchronous clamping is realized, and the workpiece needing multi-direction positioning is suitable.

[0034] In the description of the present application, it should be noted that when the terms indicating the orientation or position relationship such as "upper", "lower", "inner", "outer", "left", "right" and the like appear, they should be understood as the orientation or position relationship based on the orientation or position relationship shown in the drawings, or the orientation or position relationship commonly used when the product of the present application is used, or the orientation or position relationship commonly understood by those skilled in the art, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present application. In addition, when the terms "first", "second" and the like appear, they are only used to distinguish the description, and cannot be understood as indicating or implying relative importance. In the description of the present application, it should also be noted that unless otherwise explicitly specified and limited, the terms "mounting", "setting", "connecting" and the like should be understood in a broad sense, for example, "connecting" can be fixedly connected, or can be detachably connected, or integrally connected; can be mechanically connected, or can be electrically connected; can be directly connected, or can be indirectly connected through an intermediate medium; can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

Claims

1. A single-drive clamping device with a bidirectional synchronous pressing structure, comprising: A support assembly component having an assembly space; A drive assembly, which is mounted in a support assembly and can operate in the support assembly, has a power output end that can reciprocate in a first direction. Its characteristic is that it further includes: The first transmission component is installed in the support assembly and cooperates with the power output end of the drive component, and is driven by the drive component to move; the first transmission component includes a transmission stand, on which an active inclined surface is formed at an angle with the first direction; A first pressing assembly is installed in a first transmission assembly. The first transmission assembly drives the first pressing assembly to move in a first direction, so that the first pressing assembly can perform pressing operation on the workpiece in the first direction. The second pressing assembly is installed in the support assembly and can reciprocate in the support assembly along the second direction. The second pressing assembly includes a second pressing head, the inner end of which is provided with a passive inclined surface that abuts against the active inclined surface. When the transmission frame moves along the first direction, it pushes the passive inclined surface through the active inclined surface, driving the second pressing head to extend and retract along the second direction, thereby performing a pressing operation on the workpiece in the second direction. The first direction is perpendicular to the second direction.

2. The single-drive clamping device with a bidirectional synchronous pressing structure according to claim 1, characterized in that, Support assembly components include: A support base having a reference surface for assembly positioning; An assembly stand is installed in a support base and extends outward from the support base in a first direction.

3. The single-drive clamping device with a bidirectional synchronous pressing structure according to claim 1, characterized in that, The driver components include: A drive cylinder seat, which is mounted in a support base, has a power output shaft extending in a first direction.

4. A single-drive clamping device with a bidirectional synchronous pressing structure according to claim 1, characterized in that: The drive assembly uses a pneumatic cylinder, a hydraulic cylinder, or a servo electric actuator.

5. A single-drive clamping device with a bidirectional synchronous pressing structure according to claim 2, characterized in that, The first transmission assembly includes: A transmission frame is connected to the power output end of the drive assembly and extends along a first direction. The drive assembly drives the transmission frame to reciprocate along the first direction. A transmission beam is hinged to the end of the transmission frame and can swing with the transmission frame. The transmission link is hinged at one end to the middle of the transmission beam and at the other end to the end of the assembly stand, and can swing together with the transmission beam.

6. A single-drive clamping device with a bidirectional synchronous pressing structure according to claim 5, characterized in that, The first pressure assembly includes: The first pressure seat is installed at the end of the transmission beam. When the transmission beam swings, it can carry the first pressure seat to reciprocate along the first direction. The first guide hole is provided inside the first pressure seat and extends along the first direction. The first pressure head has its inner end inserted into the first guide hole and its outer end extending toward the workpiece. It can reciprocate along the first direction with the first pressure seat and can extend and retract along the first direction in the first guide hole. The first pressure head performs a pressing operation on the workpiece in the first direction.

7. A single-drive clamping device with a bidirectional synchronous pressing structure according to claim 5, characterized in that, The second pressure assembly includes: The second pressure head extends along the second direction. A second guide hole is provided in the assembly stand. The second guide hole extends along the second direction. The second pressure head passes through the second guide hole and can extend and retract along the second direction in the second guide hole. Its inner end cooperates with the active inclined surface, and its outer end extends towards the workpiece. The second pressure head performs a pressing operation on the workpiece in the second direction.

8. A single-drive clamping device with a bidirectional synchronous pressing structure according to claim 6, characterized in that, The first pressure assembly also includes: The first shoulder is formed on the outer end side wall of the first pressure head; A first compression spring is sleeved on the outside of the first pressure head. One end of the spring abuts against the first shoulder, and the other end abuts against the first guide hole. The first compression spring applies an elastic restoring force extending in the first direction to the first pressure head.

9. A single-drive clamping device with a bidirectional synchronous pressing structure according to claim 7, characterized in that, The second pressure assembly also includes: The second shoulder is formed on the inner end side wall of the second pressure head; The second compression spring is sleeved on the outside of the second pressure head. One end of the spring abuts against the second shoulder, and the other end abuts against the second guide hole. The second compression spring applies an elastic restoring force extending in the second direction to the second pressure head.

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