Double-acting pneumatic chuck

Abstract

The utility model relates to a double-acting pneumatic chuck which comprises a chuck body and a driving mechanism in transmission connection with the chuck body through a transmission assembly, the chuck body comprises a cylinder body assembly, a front cover arranged on the front side of the cylinder body assembly and two pairs of clamping jaw assemblies installed on the front cover, and a front piston and a rear piston are arranged in the cylinder body assembly. The front piston and the rear piston are connected with two guide push rings located between the cylinder body assemblies respectively, and the two guide push rings are correspondingly connected with the two pairs of clamping jaw assemblies through crank connecting rods respectively. The two pairs of clamping jaw assemblies can be independently driven, the two clamping jaw assemblies in the same group can synchronously clamp or loosen, the clamping precision of pipes is guaranteed, the cutting efficiency is improved, and the cutting quality is guaranteed.

Description

Technical Field

[0001] The utility model belongs to the field of pneumatic chuck equipment, and in particular relates to a double-acting pneumatic chuck. Background Art

[0002] The pneumatic chuck drives the clamping jaws through the movement of the piston to clamp or loosen the pipe. During the critical cutting process, the clamping jaws clamp the pipe and drive the pipe to rotate to cooperate with the cutting tool to complete the critical complete cutting.

[0003] Most existing pneumatic chucks use the movement of the same piston to drive four jaws to move or stop at the same time. When the pipe is deformed, it is very easy for one pair of jaws to fail to clamp in place, which can easily cause the pipe to loosen during the cutting process, thereby affecting the cutting efficiency and cutting quality. Utility Model Content

[0004] The utility model aims to provide a double-acting pneumatic chuck to solve the problem that the pipe cannot be clamped in place.

[0005] A double-acting pneumatic chuck of the utility model is realized as follows:

[0006] A double-acting pneumatic chuck comprises a chuck body and a driving mechanism connected to the chuck body through a transmission assembly, wherein:

[0007] The chuck body includes a cylinder assembly, a front cover arranged at the front side of the cylinder assembly, and two pairs of clamping jaw assemblies installed on the front cover.

[0008] A front piston and a rear piston are arranged in the cylinder assembly, and the front piston and the rear piston are respectively connected to two guide push rings located between the cylinder assemblies, and the two guide push rings are respectively connected to two pairs of clamping jaw assemblies through crank connecting rods.

[0009] Furthermore, the cylinder assembly includes a cylinder, a front sealing flange installed at the front end of the cylinder, and a rear sealing flange installed at the rear end of the cylinder.

[0010] Furthermore, the cylinder body is provided with an air intake passage I and an air intake passage II which are connected with the inner cavity of the cylinder body assembly.

[0011] The air inlet passage I is inhaled, the front piston and the rear piston move backward, and the two clamping jaw assemblies in the same group move toward each other;

[0012] The air intake passage II takes in air, the front piston and the rear piston move forward, and the two clamping jaw assemblies in the same group move in opposite directions.

[0013] Furthermore, the two guide push rings are respectively an outer guide push ring connected to the front end of the front piston, and an inner guide push ring connected to the front end of the rear piston. The outer guide push ring is sleeved outside the inner guide push ring, and the two can move relatively.

[0014] Furthermore, the outer guide push ring is provided with an outer avoidance groove, and the crank connecting rod connected to the inner guide push ring can move in the outer avoidance groove;

[0015] The inner guide push ring is provided with an inner avoidance groove, and the connection between the outer guide push ring and the corresponding crank connecting rod is provided with an inner protrusion which extends into the inner avoidance groove and can move in the inner avoidance groove.

[0016] Furthermore, a bearing is installed outside the cylinder assembly, the outer ring of the bearing is fixed on the bearing seat, and the inner ring is connected to the cylinder assembly;

[0017] The bearing seat is provided with two air inlets which are respectively connected with the air inlet passage I and the air inlet passage II.

[0018] Furthermore, a fixing flange is provided on the front side of the cylinder assembly, and a hinge seat is provided on the front side of the fixing flange, and the inflection point of the crank connecting rod is correspondingly hinged on the hinge seat;

[0019] A connecting cylinder body connected to the fixing flange is arranged on the front side thereof, and the connecting cylinder body is connected to the front cover.

[0020] Further, the clamping jaw assembly includes a slider connected to the corresponding crank connecting rod, and a clamping jaw mounted on the slider and having an adjustable position, wherein the slider is mounted in a slide groove on the front cover;

[0021] The clamping jaw cooperates with the sliding block through a tooth surface, and the teeth on the tooth surface are rectangular teeth.

[0022] Further, the transmission assembly is a transmission gear installed on the rear side of the chuck body and connected to the cylinder assembly;

[0023] The driving mechanism comprises a motor, a motor seat is installed outside the bearing seat, the motor is installed on the motor seat and is in transmission connection with the transmission gear.

[0024] Furthermore, it also includes a material guiding mechanism that rotates synchronously with the cylinder assembly;

[0025] The material guiding mechanism comprises two pairs of guide rollers which are arranged opposite to each other, and the two guide rollers in the same group can move towards or away from each other.

[0026] After adopting the above technical solution, the utility model has the following beneficial effects:

[0027] The utility model is provided with two pistons and two guide push rings, each piston is connected to the guide push ring matched therewith, and utilizes the crank connecting rod to drive the corresponding pair of clamping jaw assemblies to move, thereby realizing the independent driving of the two pairs of clamping jaw assemblies and the synchronous clamping or loosening of the two clamping jaw assemblies in the same group, thereby ensuring the clamping accuracy of the pipe, improving the cutting efficiency and ensuring the cutting quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0029] Figure 1 It is a structural diagram of a double-acting pneumatic chuck of Example 1 of the utility model;

[0030] Figure 2 It is a front view of the double-acting pneumatic chuck of Example 1 of the utility model;

[0031] Figure 3 yes Figure 2 Cross-section view in the AA direction;

[0032] Figure 4 yes Figure 2 Cross-section along the middle BB direction;

[0033] Figure 5 It is a structural diagram of the guide push ring portion of the double-acting pneumatic chuck of Example 1 of the utility model;

[0034] Figure 6 It is a structural diagram of a double-acting pneumatic chuck of Embodiment 2 of the present utility model;

[0035] Figure 7 It is a structural diagram of a double-acting pneumatic chuck of Embodiment 3 of the present utility model;

[0036] In the figure: front cover 1, front piston 2, rear piston 3, crank connecting rod 4, cylinder body 5, front sealing flange 6, rear sealing flange 7, intake channel I8, intake channel II9, outer guide push ring 10, inner guide push ring 11, outer avoidance groove 12, inner avoidance groove 13, bearing 14, inner bearing seat 15, outer bearing seat 16, support seat 17, air inlet 18, intake ring groove I19, intake ring groove II20, fixed flange 21, hinged seat 22, connecting cylinder 23, dustproof cylinder 24, slider 25, clamping claw 26, transmission gear 27, motor 28, motor seat 29, guide roller 30, mounting plate 31, slide plate 32, intermediate cylinder 33, fixed plate 34. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical solution and advantages of the implementation of the utility model clearer, the technical solution in the implementation of the utility model will be clearly and completely described below in conjunction with the drawings in the implementation of the utility model. Obviously, the described implementation is a part of the implementation of the utility model, not all of the implementations. Based on the implementation of the utility model, all other implementations obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0038] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present invention.

[0039] Example 1

[0040] like Figure 1-5 As shown, a double-acting pneumatic chuck includes a chuck body and a driving mechanism connected to the chuck body through a transmission assembly. The chuck body includes a cylinder assembly, a front cover 1 arranged on the front side of the cylinder assembly, and two pairs of jaw assemblies installed on the front cover 1. A front piston 2 and a rear piston 3 are arranged in the cylinder assembly. The front piston 2 and the rear piston 3 are respectively connected to two guide push rings located between the cylinder assembly. The two guide push rings are respectively connected to the two pairs of jaw assemblies through a crank connecting rod 4.

[0041] When the chuck clamps the pipe, the two jaw assemblies in the same group move toward each other synchronously under the drive of the same piston. When one pair of jaw assemblies is clamped and the other pair is not clamped, the unclamped pair of jaw assemblies can continue to move toward each other until both pairs of jaw assemblies are firmly clamped on the outer wall of the pipe.

[0042] The cylinder assembly can be arranged to cooperate with the front piston 2 and the rear piston 3 to form a sealed cavity, so that the movement of the two pistons can be achieved by introducing air into the cavity. In order to achieve this effect, the cylinder assembly includes a cylinder body 5, a front sealing flange 6 installed at the front end of the cylinder body 5, and a rear sealing flange 7 installed at the rear end of the cylinder body 5.

[0043] Among them, the front sealing flange 6 and the rear sealing flange 7 are connected to the cylinder body 5 by bolts, and sealing rings are provided at the joints. The matching parts of the front sealing flange 6 and the front piston 2, as well as the matching parts of the rear sealing flange 7 and the rear piston 3 are provided with sealing rings to ensure the sealing effect.

[0044] In order to allow air to flow into the cylinder assembly to promote the movement of the front piston 2 and the rear piston 3, the cylinder 5 is provided with an air intake passage Ⅰ8 and an air intake passage Ⅱ9 which are connected to the inner cavity of the cylinder assembly.

[0045] Air is taken in through the air intake passage Ⅰ8, the front piston 2 and the rear piston 3 move backwards, and the two clamping jaw assemblies in the same group move toward each other;

[0046] Specifically, the front piston 2 is sleeved on the rear piston 3, and the cylinder body 5 is located outside the front piston 2 and the rear piston 3, and a convex ring I extending inward is provided on the inner wall of the cylinder body 5, and a convex ring II extending outward and located in front of the convex ring I is provided on the outer wall of the front piston 2, and a convex ring III extending outward and located behind the convex ring I is provided on the outer wall of the rear piston 3, wherein a sealing chamber I is formed between the front sealing flange 6 and the convex ring II, and a sealing chamber II is formed between the convex ring I and the convex ring III, and an intake channel I8 is respectively connected with the sealing chamber I and the sealing chamber II. After ventilation, the front piston 2 and the rear piston 3 can be pushed to move backward.

[0047] Air is taken in through the air intake passage II 9, the front piston 2 and the rear piston 3 move forward, and the two clamping jaw assemblies in the same group move in opposite directions.

[0048] A sealing chamber III is provided between the convex ring II and the convex ring I, a sealing chamber IV is provided between the convex ring III and the rear sealing flange 7, and the air intake passage II9 is ​​connected with the sealing chamber III and the sealing chamber IV respectively. After ventilation, the flange of the front piston 2 and the flange of the rear piston 3 can be pushed forward.

[0049] In order to be able to drive the clamping jaw assembly to move through the piston, the two guide push rings are respectively an outer guide push ring 10 connected to the front end of the front piston 2, and an inner guide push ring 11 connected to the front end of the rear piston 3. The outer guide push ring 10 is sleeved outside the inner guide push ring 11, and the two can move relative to each other.

[0050] The front piston 2 drives a corresponding group of clamping jaw assemblies to move through the outer guide push ring 10 and the crank connecting rod 4 matched therewith; the rear piston 3 drives a corresponding group of clamping jaw assemblies to move through the inner guide push ring 11 and the crank connecting rod 4 matched therewith.

[0051] The guide push ring is connected to the corresponding piston through screws.

[0052] In order to avoid interference between the two guide push rings, an outer avoidance groove 12 is provided on the outer guide push ring 10 , and the crank connecting rod 4 connected to the inner guide push ring 11 can move in the outer avoidance groove 12 .

[0053] The crank connecting rod 4 connected to the inner guide push ring 11 passes through the outer avoidance groove 12 and is connected to the inner guide push ring 11 .

[0054] An inner avoidance groove 13 is provided on the inner guide push ring 11 , and an inner protrusion extending into the inner avoidance groove 13 and movable in the inner avoidance groove 13 is provided at the connection point between the outer guide push ring 10 and the corresponding crank connecting rod 4 .

[0055] The inner avoidance groove 13 is used to accommodate the inner protrusion and leave a margin for the movement of the inner protrusion.

[0056] In order to enable the cylinder assembly to rotate synchronously with the driving mechanism, a bearing 14 is installed outside the cylinder assembly. The outer ring of the bearing 14 is fixed on the bearing seat, and the inner ring is connected to the cylinder assembly.

[0057] In this embodiment, the bearing seat includes an inner bearing seat 15 and an outer bearing seat 16, which are fixedly connected, or the two can be set as an integral structure.

[0058] The bottom of the outer bearing seat 16 is a support seat 17, which can support the entire pneumatic chuck to ensure the stability of the pneumatic chuck when working.

[0059] The utility model adopts a single bearing 14 structure, which can simplify the structure of the chuck body and reduce the axial thickness of the chuck body compared to the double bearing 14 structure, making the structure more compact and more convenient to use.

[0060] Preferably, the bearing 14 may be selected from but is not limited to a cross roller bearing.

[0061] In order to allow air to flow into the air intake passage Ⅰ8 and the air intake passage Ⅱ9, two air intake ports 18 which are connected to the air intake passage Ⅰ8 and the air intake passage Ⅱ9 respectively are provided on the bearing seat.

[0062] Specifically, an intake ring groove Ⅰ19 connected to the intake passage Ⅰ8 and an intake ring groove Ⅱ20 connected to the intake passage Ⅱ9 are provided on the inner ring surface of the inner bearing seat 15, and two intake ports 18 are connected to the intake ring groove Ⅰ19 and the intake ring groove Ⅱ20 respectively.

[0063] In order to facilitate the installation of the crank connecting rod 4, a fixing flange 21 is provided on the front side of the cylinder assembly, and a hinge seat 22 is provided on the front side of the fixing flange 21. The inflection point of the crank connecting rod 4 is correspondingly hinged on the hinge seat 22.

[0064] Specifically, the front side surface of the fixed flange 21 is provided with an annular protrusion extending forward, and the annular protrusion is evenly divided into four arc segments, and both ends of each arc segment are provided with outward extensions. The two adjacent arc segments are close to each other to form an articulated seat 22, and the crank connecting rod 4 is installed on the corresponding articulated seat 22. This articulated seat 22 structure can ensure the overall accuracy of the chuck and has better stability.

[0065] The inflection point of the crank connecting rod 4 is arranged outward, the top of the crank connecting rod 4 is hinged on the corresponding clamping jaw assembly, and the inner end is hinged on the corresponding guide push ring, so that the transmission between the guide push ring and the clamping jaw assembly can be realized.

[0066] In order to achieve the connection and fixation between the front cover 1 and the cylinder assembly, a connecting cylinder 23 connected to the fixing flange 21 is provided on the front side thereof, and the connecting cylinder 23 is connected to the front cover 1 .

[0067] The cylinder assembly is connected to the connecting cylinder 23 by bolts, and the connecting cylinder 23 is connected to the front cover 1 by bolts.

[0068] Preferably, in order to prevent debris from entering the chuck body, a dustproof cylinder 24 is provided in the inner ring of the chuck body.

[0069] In order to achieve the clamping or loosening of the clamping jaw assembly, the clamping jaw assembly includes a slider 25 connected to the corresponding crank connecting rod 4, and a clamping jaw 26 installed on the slider 25 and adjustable in position. The slider 25 is installed in a slide groove on the front cover 1.

[0070] The upper end of the crank connecting rod 4 is connected to the bottom of the slider 25, and the slider 25 is driven to move in the slide groove by the swing of the crank connecting rod 4.

[0071] In order to ensure the stability of the cooperation between the clamping jaw 26 and the slider 25, the clamping jaw 26 cooperates with the slider 25 through the tooth surface, and the teeth on the tooth surface are rectangular teeth.

[0072] A locking block is provided between the clamping jaw 26 and the slider 25 , and a bolt passing through the locking block is installed on the clamping jaw 26 . When the bolt is loosened, the clamping jaw 26 can move relative to the slider 25 , and when the bolt is tightened, the clamping jaw 26 and the slider 25 can be locked.

[0073] The arrangement of the rectangular teeth allows for a more intuitive view of the relative positions of the clamping jaw 26 and the slider 25, making the use more convenient.

[0074] In order to realize the transmission between the chuck body and the driving mechanism, the transmission assembly is a transmission gear 27 installed at the rear side of the chuck body and connected to the cylinder assembly.

[0075] Specifically, the transmission gear 27 is installed on the rear side of the cylinder body 5 and connected to the rear sealing flange 7 by bolts. The transmission gear 27 can drive all components of the chuck body except the outer ring of the bearing 14 and the bearing seat to rotate synchronously.

[0076] In order to provide power for the rotation of the pneumatic chuck, the driving mechanism includes a motor 28 , a motor seat 29 is installed outside the bearing seat, and the motor 28 is installed on the motor seat 29 and is in transmission connection with the transmission gear 27 .

[0077] The motor seat 29 can be installed at any position on the side of the bearing seat, and the output end of the motor 28 can be installed with a driving gear meshing with the transmission gear 27, so that the torque is transmitted to the chuck body through the transmission gear 27.

[0078] The utility model has a simple and compact overall structure, can realize the synchronous action of two clamping jaws 26 in the same group, ensure the stability of the two pairs of clamping jaws 26 clamping the pipe, and improve the efficiency and quality of pipe cutting.

[0079] Example 2

[0080] like Figure 6 As shown, based on Example 1, this embodiment further provides a double-acting pneumatic chuck, which also includes a material guiding mechanism that rotates synchronously with the cylinder assembly.

[0081] The material guiding mechanism is located at the rear side of the chuck body, mounted on the transmission gear 27 , and can rotate synchronously with the transmission gear 27 .

[0082] In order to ensure the stability of the pipe during cutting, the material guiding mechanism includes two pairs of guide rollers 30 arranged opposite to each other, and the two guide rollers 30 in the same group can move toward or away from each other.

[0083] Specifically, the material guiding mechanism includes a mounting plate 31 fixed on the transmission gear 27, and two pairs of slide plates 32 are arranged on the mounting plate 31. The mounting plate of the guide roller 30 can move on the slide plate 32, and the two are fixed by bolts. After the pipe is installed on the pneumatic chuck, the two relative guide rollers 30 can be moved inward to clamp them on the periphery of the pipe, thereby providing support for the movement of the pipe and ensuring stability during the pipe cutting process.

[0084] Example 3

[0085] like Figure 7 As shown, based on Example 2, this embodiment further provides a double-acting pneumatic chuck, whose material guide mechanism also includes an intermediate cylinder 33, that is, the mounting plate 31 is fixed on the transmission gear 27, and a fixed plate 34 parallel to the mounting plate 31 is arranged at the rear side, the intermediate cylinder 33 is located between the mounting plate 31 and the fixed plate 34, and the slide plate 32 is installed on the fixed plate 34. The setting of the intermediate cylinder 33 can lengthen the material guide mechanism and further ensure the stability during the pipe cutting process.

[0086] Based on the above ideal embodiments of the utility model, the relevant staff can make various changes and modifications without deviating from the technical concept of the utility model through the above description. The technical scope of the utility model is not limited to the content of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A double-acting pneumatic chuck, characterized in that: It includes a chuck body and a driving mechanism connected to the chuck body through a transmission assembly, wherein: The chuck body comprises a cylinder assembly, a front cover (1) arranged at the front side of the cylinder assembly, and two pairs of clamping jaw assemblies mounted on the front cover (1). A front piston (2) and a rear piston (3) are arranged in the cylinder assembly. The front piston (2) and the rear piston (3) are respectively connected to two guide push rings located between the cylinder assembly. The two guide push rings are respectively connected to two pairs of clamping jaw assemblies via a crank connecting rod (4).

2. The double-acting pneumatic chuck according to claim 1, characterized in that: The cylinder assembly comprises a cylinder (5), a front sealing flange (6) installed at the front end of the cylinder (5), and a rear sealing flange (7) installed at the rear end of the cylinder (5).

3. The double-acting pneumatic chuck according to claim 2, characterized in that: The cylinder body (5) is provided with an air intake passage I (8) and an air intake passage II (9) which are in communication with the inner cavity of the cylinder body assembly. The air intake passage I (8) takes in air, the front piston (2) and the rear piston (3) move backward, and the two clamping jaw assemblies in the same group move toward each other; The air intake passage II (9) takes in air, the front piston (2) and the rear piston (3) move forward, and the two clamping jaw assemblies in the same group move in opposite directions.

4. The double-acting pneumatic chuck according to claim 1, characterized in that: The two guide push rings are respectively an outer guide push ring (10) connected to the front end of the front piston (2), and an inner guide push ring (11) connected to the front end of the rear piston (3). The outer guide push ring (10) is sleeved outside the inner guide push ring (11), and the two can move relative to each other.

5. The double-acting pneumatic chuck according to claim 4, characterized in that: The outer guide push ring (10) is provided with an outer avoidance groove (12), and the crank connecting rod (4) connected to the inner guide push ring (11) can move in the outer avoidance groove (12); The inner guide push ring (11) is provided with an inner avoidance groove (13), and the portion where the outer guide push ring (10) is connected to the corresponding crank connecting rod (4) is provided with an inner protrusion which extends into the inner avoidance groove (13) and can move in the inner avoidance groove (13).

6. The double-acting pneumatic chuck according to claim 3, characterized in that: A bearing (14) is installed outside the cylinder assembly, the outer ring of the bearing (14) is fixed on the bearing seat, and the inner ring is connected to the cylinder assembly; The bearing seat is provided with two air inlets (18) which are respectively connected with the air inlet passage I (8) and the air inlet passage II (9).

7. The double-acting pneumatic chuck according to claim 1, characterized in that: A fixing flange (21) is arranged on the front side of the cylinder assembly, and a hinge seat (22) is arranged on the front side of the fixing flange (21), and the inflection point of the crank connecting rod (4) is correspondingly hinged on the hinge seat (22); A connecting cylinder (23) connected to the fixing flange (21) is provided on the front side thereof, and the connecting cylinder (23) is connected to the front cover (1).

8. The double-acting pneumatic chuck according to claim 1, characterized in that: The clamping jaw assembly comprises a slider (25) connected to a corresponding crank connecting rod (4), and a clamping jaw (26) mounted on the slider (25) and having an adjustable position, wherein the slider (25) is mounted in a slide groove on the front cover (1); The clamping jaw (26) cooperates with the sliding block (25) via a tooth surface, and the teeth on the tooth surface are rectangular teeth.

9. The double-acting pneumatic chuck according to claim 6, characterized in that: The transmission assembly is a transmission gear (27) installed on the rear side of the chuck body and connected to the cylinder assembly; The driving mechanism comprises a motor (28). A motor seat (29) is mounted outside the bearing (14) seat. The motor (28) is mounted on the motor seat (29) and is drivingly connected to the transmission gear (27).

10. The double-acting pneumatic chuck according to claim 1, characterized in that: It also includes a material guiding mechanism that rotates synchronously with the cylinder assembly; The material guiding mechanism comprises two pairs of guide rollers (30) arranged opposite to each other, and the two guide rollers (30) in the same group can move towards or away from each other.

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