Large-clamping-force centering clamp

Abstract

The utility model belongs to the technical field of hydraulic clamps, and particularly relates to a large-clamping-force centering clamp. The clamp comprises a clamp seat, a first sliding table, a second sliding table and a centering mechanism, a first hydraulic cavity and a second hydraulic cavity are formed in the clamp seat; a first piston shaft and a second piston shaft are respectively arranged in the first hydraulic cavity and the second hydraulic cavity; the first sliding table and the second sliding table are fixedly connected to the first piston shaft, and the second piston shaft centering mechanism is arranged between the first piston shaft and the second piston shaft and meshed with the first piston shaft and the second piston shaft at the same time. According to the large-clamping-force centering clamp, the clamping force can be effectively increased, and the situation that the upper clamping position deviates from the preset center point can be avoided through the centering mechanism.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of hydraulic clamps, and particularly relates to a large-clamping-force centering clamp. BACKGROUND

[0002] Please refer to Chinese Patent: A hydraulic clamping table (authorized publication number: CN 210232327 U). In the hydraulic clamping table, the first sliding table and the second sliding table are respectively matched with the inclined surfaces between the left and right inclined sliding grooves on the piston rod and the pull plate, and driving force is provided by the hydraulic mechanism (including the piston rod and the pull plate) arranged at the middle part of the clamping table body. There are the following problems: 1. The stroke of the first sliding table and the second sliding table is limited by the size of the left and right inclined sliding grooves on the pull plate, and cannot meet the needs of applications requiring a large stroke; 2. The driving force of the first sliding table and the second sliding table is derived from the lifting movement of the piston rod in the hydraulic mechanism at the middle part of the clamping table, and the clamping force is insufficient. CONTENT OF THE UTILITY MODEL

[0003] Therefore, the application provides a large-clamping-force centering clamp to solve all or part of the technical problems described in the background art.

[0004] The innovative idea of the application is: 1. Hydraulic mechanisms are respectively configured for the two sliding tables to increase the clamping force; 2. A centering mechanism is arranged between the hydraulic mechanisms of the two sliding tables to realize the synchronization of the clamping or loosening actions of the two sliding tables.

[0005] The solution provided by the application to solve the technical problems is:

[0006] A large-clamping-force centering clamp, comprising a clamp seat, a first sliding table and a second sliding table; the clamp seat is provided with a first hydraulic cavity and a second hydraulic cavity; the first hydraulic cavity and the second hydraulic cavity are respectively provided with a first piston shaft and a second piston shaft; the clamp seat is further provided with a same-direction driving oil path and a reverse-direction driving oil path; the first hydraulic cavity and the second hydraulic cavity each comprise a same-direction driving end and a reverse-direction driving end; the same-direction driving oil path and the reverse-direction driving oil path are respectively connected to the same-direction driving end and the reverse-direction driving end; the first hydraulic cavity and the second hydraulic cavity are respectively provided with a first sliding groove and a second sliding groove; the first sliding table and the second sliding table are respectively fixedly connected to the first piston shaft and the second piston shaft through the first sliding groove and the second sliding groove.

[0007] Hydraulic oil is fed from the same-direction driving oil path to the same-direction driving ends of the first hydraulic cavity and the second hydraulic cavity, and the first sliding table and the second sliding table can approach each other to clamp a workpiece; hydraulic oil is fed from the reverse-direction driving oil path to the reverse-direction driving ends of the first hydraulic cavity and the second hydraulic cavity, and the first sliding table and the second sliding table can move away from each other to loosen the workpiece.

[0008] Further, the first piston shaft comprises a shaft body, a first piston and a second piston; the first piston and the second piston are respectively arranged at two ends of the shaft body; the second piston shaft has the same structure as the first piston shaft; the first sliding table and the second sliding table are respectively fixedly connected to the shaft body parts of the first piston shaft and the second piston shaft.

[0009] The first piston and the second piston are respectively arranged at the same direction driving end and the opposite direction driving end of the hydraulic cavity; after receiving the oil pressure from the same direction driving end or the opposite direction driving end, the shaft body can be driven to move linearly in the hydraulic cavity, so as to realize the mutual approaching or moving away of the first sliding table and the second sliding table.

[0010] Further, the large clamping force centering clamp further comprises a first connecting piece and a second connecting piece; the first sliding table and the second sliding table are respectively fixedly connected to the first piston shaft and the second piston shaft through the first connecting piece and the second connecting piece.

[0011] Further, the large clamping force centering clamp further comprises a centering mechanism; the centering mechanism comprises a centering seat, a centering shaft and a centering gear; the centering mechanism hole is further arranged on the clamp seat; the centering mechanism hole is arranged between the first hydraulic cavity and the second hydraulic cavity and is communicated to the first hydraulic cavity and the second hydraulic cavity; the first piston shaft and the second piston shaft are both provided with a rack structure; the centering seat is fixed on the clamp seat, the centering shaft extends into the centering mechanism hole, and the centering gear is assembled on the centering shaft and simultaneously meshes with the rack structures on the first piston shaft and the second piston shaft.

[0012] When the first piston shaft is displaced under the action of oil pressure, the second piston shaft can be driven to move synchronously by the centering gear; similarly, when the second piston shaft is displaced under the action of oil pressure, the first piston shaft can also be driven to move synchronously by the centering gear; so that the first sliding table and the second sliding table can move synchronously to avoid the upper clamping position deviating from the predetermined center point.

[0013] Further, the two sides of the clamp seat are provided with sliding table guide rails; the first sliding table and the second sliding table are both provided with guide rail grooves; the first sliding table and the second sliding table are slidably assembled on the clamp seat through the cooperation of the guide rail grooves and the sliding table guide rails.

[0014] The slidable connection between the sliding table and the clamp seat realized by the guide rail grooves and the sliding table guide rails can increase the stability of the sliding table movement.

[0015] Further, the first sliding table and the second sliding table are both provided with wear-resistant pieces. The wear-resistant pieces help to increase the wear resistance and impact resistance of the sliding table.

[0016] Further, the two ends of the first hydraulic cavity and the second hydraulic cavity are sealed by sealing covers.

[0017] Beneficial technical effects:

[0018] The large clamping force centering clamp disclosed in the application can effectively increase the clamping force by configuring hydraulic drive mechanisms for two sliding tables on the clamp base. Meanwhile, by setting a centering mechanism between the two sets of hydraulic drive mechanisms, the upper clamping position can also be prevented from deviating from the predetermined center point through the synchronous operation of the two sliding tables.

[0019] The technical solutions and technical effects of the application are described in detail below in combination with the accompanying drawings and specific embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0020] Fig. 1 Fig. 1 is a schematic diagram of the three-dimensional structure of the large clamping force centering clamp;

[0021] Fig. 2 Fig. 2 is an exploded view of the top perspective structure of the large clamping force centering clamp;

[0022] Fig. 3 Fig. 3 is an exploded view of the bottom perspective structure of the large clamping force centering clamp;

[0023] Fig. 4 is a schematic diagram of the large clamping force centering clamp;

[0024] 1 - clamp base;

[0025] 11 - first hydraulic cavity, 12 - second hydraulic cavity, 13 - same direction drive oil way, 14 - opposite direction drive oil way, 17 - centering mechanism hole, 18 - sliding table guide rail; 111 - first sliding groove, 121 - second sliding groove;

[0026] 2 - first sliding table, 21 - first connecting piece;

[0027] 3 - second sliding table, 31 - second connecting piece;

[0028] 4 - first piston shaft, 41 - shaft body, 42 - first piston, 43 - second piston;

[0029] 5 - second piston shaft;

[0030] 6 - centering mechanism, 61 - centering seat, 62 - centering shaft, 63 - centering gear;

[0031] 7 - rack structure;

[0032] 8 - guide rail groove;

[0033] 9 - wear-resistant part;

[0034] 10 - sealing cover. DETAILED DESCRIPTION

[0035] Please refer to Figs. 1-3The large clamping force centering clamp disclosed in the application comprises a clamp base 1, a first sliding table 2 and a second sliding table 3. The first sliding table 2 and the second sliding table 3 can move towards each other on the clamp base 1 to clamp a workpiece, and can move away from each other to release the workpiece.

[0036] Sliding table guide rails 18 are arranged on both sides of the clamp base 1, and guide rail grooves 8 are arranged on the first sliding table 2 and the second sliding table 3. The first sliding table 2 and the second sliding table 3 are slidably assembled on the clamp base 1 through the cooperation of the guide rail grooves 8 and the sliding table guide rails 18.

[0037] The clamp base 1 is provided with a first hydraulic cavity 11 and a second hydraulic cavity 12. The first hydraulic cavity 11 and the second hydraulic cavity 12 extend in parallel. First piston shafts 4 and second piston shafts 5 are arranged in the first hydraulic cavity 11 and the second hydraulic cavity 12 respectively. The first hydraulic cavity 11 and the second hydraulic cavity 12 are sealed by sealing covers 10 at both ends.

[0038] The first hydraulic cavity 11 and the second hydraulic cavity 12 each comprise a same-direction driving end and an opposite-direction driving end. The clamp base 1 is further provided with a same-direction driving oil way 13 and an opposite-direction driving oil way 14. The same-direction driving oil way 13 and the opposite-direction driving oil way 14 are connected to the same-direction driving end and the opposite-direction driving end respectively.

[0039] The same-direction driving end refers to that when oil pressure is applied to the pistons of the piston shafts from this end, the first piston shafts 4 and the second piston shafts 5 can move towards each other to clamp a workpiece. On the contrary, the opposite-direction driving end refers to that when oil pressure is applied to the pistons of the piston shafts from this end, the first piston shafts 4 and the second piston shafts 5 can move away from each other to release the workpiece. The movement direction of the piston shafts and the oil way configuration of the hydraulic oil are common technical knowledge in the field, and will not be described here.

[0040] The first piston shafts 4 and the second piston shafts 5 in the application have the same structure. Taking the first piston shaft 4 as an example, the first piston shaft 4 comprises a shaft body 41, a first piston 42 and a second piston 43. The first piston 42 and the second piston 43 are arranged at both ends of the shaft body 41 and are located at the same-direction driving end and the opposite-direction driving end of the hydraulic cavity respectively.

[0041] The large clamping force centering clamp further comprises a first connecting piece 21 and a second connecting piece 31. First sliding grooves 111 and second sliding grooves 121 are arranged on the first hydraulic cavity 11 and the second hydraulic cavity 12 respectively. The first sliding table 2 and the second sliding table 3 are fixedly connected to the shaft bodies of the first piston shafts 4 and the second piston shafts 5 through the first connecting piece 21 and the second connecting piece 31 respectively.

[0042] Therefore, when the first piston shafts 4 and the second piston shafts 5 move towards each other or move away from each other, the first sliding table 2 and the second sliding table 3 can be driven to move synchronously to clamp or release the workpiece.

[0043] In order to increase the friction resistance and the impact resistance of the first sliding table 2 and the second sliding table 3, wear-resistant parts 9 are arranged on the first sliding table 2 and the second sliding table 3. The wear-resistant parts 9 can be made of high-quality materials to save the manufacturing cost of the first sliding table 2 and the second sliding table 3.

[0044] The hydraulic oil is supplied to the same direction driving end of the first hydraulic cavity 11 and the second hydraulic cavity 12 from the same direction driving oil path 13, so that the first sliding table 2 and the second sliding table 3 can be close to each other to clamp the workpiece; the hydraulic oil is supplied to the different direction driving end of the first hydraulic cavity 11 and the second hydraulic cavity 12 from the different direction driving oil path 14, so that the first sliding table 2 and the second sliding table 3 can be away from each other to release the workpiece.

[0045] In order to ensure that the upper clamping position of the large clamping force centering clamp of the present application does not deviate from the predetermined center, the centering clamp further comprises a centering mechanism 6.

[0046] The centering mechanism 6 comprises a centering seat 61, a centering shaft 62 and a centering gear 63; the centering mechanism hole 17 is further arranged on the clamp seat 1; the centering mechanism hole 17 is arranged between the first hydraulic cavity 11 and the second hydraulic cavity 12 and is communicated to the first hydraulic cavity 11 and the second hydraulic cavity 12; the first piston shaft 4 and the second piston shaft 5 are both provided with a rack structure 7.

[0047] The centering seat 61 is fixed on the clamp seat 1, the centering shaft 62 extends into the centering mechanism hole 17, and the centering gear 63 is assembled on the centering shaft 62 and simultaneously meshes with the rack structure 7 on the first piston shaft 4 and the second piston shaft 5.

[0048] When the first piston shaft 4 is displaced under the action of oil pressure, the second piston shaft 5 can be driven by the centering gear 63 to move synchronously; similarly, when the second piston shaft 5 is displaced under the action of oil pressure, the first piston shaft 4 can also be driven by the centering gear 63 to move synchronously; so that the first sliding table 2 and the second sliding table 3 can avoid the deviation of the upper clamping position from the predetermined center point through synchronous action.

[0049] Principle and effect:

[0050] The hydraulic oil is fed from the same direction driving oil path 13 to the same direction driving end of the first hydraulic cavity 11 and the second hydraulic cavity 12, and the oil pressure of the opposite direction driving oil path 14 is removed; at this time, the first piston shaft 4 and the second piston shaft 5 move oppositely, and the first slide table 2 and the second slide table 3 are close to each other to clamp the workpiece; the hydraulic oil is fed from the opposite direction driving oil path 14 to the opposite direction driving end of the first hydraulic cavity 11 and the second hydraulic cavity 12, and the oil pressure of the same direction driving oil path 13 is removed; at this time, the first piston shaft 4 and the second piston shaft 5 move oppositely, and the first slide table 2 and the second slide table 3 are away from each other to release the workpiece; in the process of clamping and releasing the workpiece by the two slide tables, the centering mechanism 6 makes the first piston shaft 4 and the second piston shaft 5 run synchronously through the centering gear 63, so that the shift of the upper clamping position caused by the asynchronous movement of the first slide table 2 and the second slide table 3 can be avoided.

[0051] The technical scheme and technical effects of the present application are described in detail above in combination with the drawings and specific embodiments of the present application. It should be noted that other embodiments can be developed by those skilled in the art on the basis of the present application; any simple transformation and equivalent replacement without departing from the innovative concept of the present application are covered by the present application and belong to the protection scope of the present patent.

Claims

1. A high-clamping-force self-aligning clamp, characterized in that: Includes clamp seat (1), first slide (2), second slide (3); The clamp seat (1) is provided with a first hydraulic chamber (11) and a second hydraulic chamber (12). The first hydraulic chamber (11) and the second hydraulic chamber (12) are respectively provided with a first piston shaft (4) and a second piston shaft (5); The clamp seat (1) is also provided with a co-directional drive oil passage (13) and an anti-directional drive oil passage (14). Both the first hydraulic chamber (11) and the second hydraulic chamber (12) include a driving end in the same direction and a driving end in opposite directions; The co-directional drive oil circuit (13) and the anti-directional drive oil circuit (14) are respectively connected to the co-directional drive end and the anti-directional drive end; The first hydraulic chamber (11) and the second hydraulic chamber (12) are respectively provided with a first slide groove (111) and a second slide groove (121); The first slide (2) and the second slide (3) are fixedly connected to the first piston shaft (4) and the second piston shaft (5) through the first slide groove (111) and the second slide groove (121), respectively.

2. The high-clamping-force concentric clamp according to claim 1, characterized in that: The first piston shaft (4) includes a shaft body (41), a first piston (42), and a second piston (43); The first piston (42) and the second piston (43) are respectively disposed at both ends of the shaft (41); The second piston shaft (5) has the same structure as the first piston shaft (4); The first slide (2) and the second slide (3) are respectively fixedly connected to the shaft parts of the first piston shaft (4) and the second piston shaft (5).

3. The high-clamping-force concentric clamp according to claim 1, characterized in that: The high-clamping-force centering clamp also includes a first connector (21) and a second connector (31). The first slide (2) and the second slide (3) are fixedly connected to the first piston shaft (4) and the second piston shaft (5) respectively through the first connector (21) and the second connector (31).

4. The high-clamping-force concentric clamp according to claim 1, characterized in that: The large clamping force centering clamp also includes a centering mechanism (6); The centering mechanism (6) includes a centering seat (61), a centering shaft (62), and a centering gear (63); The clamp seat (1) is also provided with a centering mechanism hole (17); The centering mechanism hole (17) is disposed between the first hydraulic chamber (11) and the second hydraulic chamber (12) and communicates with the first hydraulic chamber (11) and the second hydraulic chamber (12). Both the first piston shaft (4) and the second piston shaft (5) are provided with rack structures (7); The centering seat (61) is fixed on the clamp seat (1), the centering shaft (62) extends into the centering mechanism hole (17), and the centering gear (63) is mounted on the centering shaft (62) and simultaneously meshes with the rack structure (7) on the first piston shaft (4) and the second piston shaft (5).

5. The high-clamping-force concentric clamp according to claim 1, characterized in that: The clamp seat (1) is provided with slide rails (18) on both sides. The first slide (2) and the second slide (3) are both provided with guide rail grooves (8); The first slide (2) and the second slide (3) are slidably mounted on the clamp seat (1) through the cooperation of the guide rail groove (8) and the slide rail (18).

6. The high-clamping-force concentric clamp according to claim 1, characterized in that: Wear-resistant parts (9) are provided on both the first slide (2) and the second slide (3).

7. The high-clamping-force concentric clamp according to claim 1, characterized in that: Both ends of the first hydraulic chamber (11) and the second hydraulic chamber (12) are sealed by sealing caps (10).

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