Self-centering sand casting ball valve clamp

Abstract

The utility model discloses a self-centering sand casting ball valve clamp, and belongs to the field of valve body machining. The utility model comprises: a base; a plurality of clamping jaw assemblies; each connecting rod mechanism comprises a sliding block, a first bending rod and a second bending rod, the sliding block is slidably installed on the top of the base between the two clamping jaw assemblies, the first bending rod and the second bending rod are installed on the two sides of the sliding block in the sliding direction of the sliding block respectively, one end of the first bending rod is slidably connected with the sliding block in the sliding direction perpendicular to the sliding block, and the other end of the first bending rod is slidably connected with the second bending rod. The other end is slidably connected with the adjacent clamping jaw assembly along the sliding direction of the vertical clamping jaw assembly; one end of the second bending rod is slidably connected with the sliding block in the sliding direction perpendicular to the sliding block, and the other end is slidably connected with the adjacent clamping jaw assembly in the sliding direction perpendicular to the clamping jaw assembly. The first bending rod and the second bending rod of the connecting rod mechanism are connected with the clamping jaw assembly and the sliding block in a sliding connection mode, the movement stroke of the clamping jaw assembly is enlarged, the clamping stability is improved, and the bearing capacity of the clamp is enhanced.

Description

TECHNICAL FIELD

[0001] The utility model relates to valve body processing technical field more specifically relates to a self-centering sand casting ball valve clamp. BACKGROUND

[0002] Valve body clamp plays a key role in the process of valve body processing, assembly, detection and other processes. The existing ball valve clamp is mostly two sets of clamping jaws arranged symmetrically on the fixed frame to clamp the ball surface of the ball valve, but the surface of the sand casting ball valve is irregular, the characteristics of the pouring riser are various, and the weight is generally more than 100 kilograms. The existing ball valve clamp cannot be clamped. Some three-jaw clamping devices use cylinders and connecting rods for driving, the connecting rod is connected with the clamping jaw, the connecting rod and the clamping jaw are hinged, the three clamping jaws are driven to move simultaneously by the rotation of the connecting rod for clamping or loosening. Not only the stroke is small and the stability is poor, but also the hinged part cannot bear large pressure, and is easy to break.

[0003] Therefore, how to provide a self-centering clamp with strong bearing capacity, large stroke and stable clamping of sand casting ball valve is a problem that needs to be solved by those skilled in the art. CONTENT OF THE UTILITY MODEL

[0004] Therefore, the utility model aims at providing a self-centering sand casting ball valve clamp to at least solve the technical problems of small stroke, poor stability, and unable to bear large bearing force in the prior art.

[0005] In order to achieve the above purpose, the utility model adopts the following technical scheme:

[0006] A self-centering sand casting ball valve clamp comprises:

[0007] A base;

[0008] A plurality of claw assembly groups are uniformly arranged along the circumferential direction of the base, each claw assembly group is slidingly installed on the top of the base along the center to the circumferential side direction of the base, and the clamping surface of each claw assembly group faces the center of the base.

[0009] A plurality of connecting rods are arranged between every two adjacent groups of the claw assemblies, each of the connecting rods comprises a sliding block, a first bent rod and a second bent rod, the sliding block is slidingly arranged on the top of the base between two groups of the claw assemblies along a direction from the center of the base to the periphery thereof, the first bent rod and the second bent rod are respectively arranged on the two sides of the sliding block along the sliding direction thereof, one end of the first bent rod is slidingly connected to the sliding block along a direction perpendicular to the sliding direction of the sliding block, and the other end of the first bent rod is slidingly connected to an adjacent claw assembly along a direction perpendicular to the sliding direction of the adjacent claw assembly; one end of the second bent rod is slidingly connected to the sliding block along a direction perpendicular to the sliding direction of the sliding block, and the other end of the second bent rod is slidingly connected to an adjacent claw assembly along a direction perpendicular to the sliding direction of the adjacent claw assembly.

[0010] A driving mechanism is fixed on the base and has an output end drivingly connected to any of the claw assemblies to drive the claw assembly to slide.

[0011] The utility model discloses a driving mechanism drives any claw assembly to slide on the surface of the base, and all claw assemblies can be driven to slide synchronously through the connecting rod mechanism to gather to the center of the base to clamp or move away from the center of the base to release, realize self-centering clamping, and the structure is simple, convenient to control, and can flexibly clamp products of different specifications; the first bent rod and the second bent rod of the connecting rod mechanism are connected to the claw assembly and the sliding block in the form of sliding connection, the movement stroke of the claw assembly is enlarged, the stability during clamping is improved, and the carrying capacity of the clamp is enhanced.

[0012] Preferably, each of the claw assemblies comprises a sliding seat and a clamping piece, a plurality of first sliding rails are uniformly and circumferentially arranged on the top of the base along a direction from the center of the base to the periphery thereof, the sliding seat is slidingly connected to the first sliding rails, and any of the sliding seats is drivingly connected to the output end of the driving mechanism; the sliding seat is provided with a first sliding hole and a second sliding hole arranged axially and perpendicularly to the first sliding rails, one end of the first bent rod away from the sliding block is slidingly inserted into the first sliding hole, and one end of the second bent rod away from the sliding block is slidingly inserted into the second sliding hole; the clamping piece is fixed on the top of the sliding seat and has a clamping surface facing the center of the base.

[0013] Preferably, the top of the first sliding rail is provided with a first dovetail sliding groove arranged along a direction from the center thereof to the periphery thereof, and the bottom of the sliding seat is formed with a first dovetail block slidingly matched with the first dovetail sliding groove.

[0014] Preferably, the clamping piece comprises a clamping plate and a supporting plate, the clamping plate is fixed on the top of the sliding seat, the clamping surface of the clamping plate faces the center of the base, and the supporting plate is arranged perpendicularly to the clamping plate and is fixed on the clamping surface of the clamping plate.

[0015] Preferably, a limiting assembly for limiting the rotation of the workpiece is further provided, the limiting assembly comprises a lifting rod and a limiting pin, a mounting plate vertically arranged relative to the first slide rail is fixed on the side wall of the clamping plate, the bottom of the lifting rod is connected to the mounting plate, the limiting pin is vertically arranged relative to the first slide rail and one end of the limiting pin is threadedly connected to the upper end of the lifting rod, and the other end of the limiting pin is capable of contacting the workpiece.

[0016] Preferably, an outer thread is arranged on the lower part of the lifting rod, and a threaded hole threadedly connected with the outer thread is formed on the mounting plate.

[0017] Preferably, the driving mechanism is a hydraulic cylinder, the cylinder body of the hydraulic cylinder is axially parallel to any one of the first slide rails, and the piston rod of the hydraulic cylinder is fixedly connected to the corresponding slide block.

[0018] Preferably, a second slide rail is fixed on the top of the base, a second dovetail sliding groove is arranged on the top of the second slide rail along the direction from the center to the periphery of the second slide rail, and a second dovetail block is formed on the bottom of the sliding block and is in sliding fit with the second dovetail sliding groove.

[0019] Preferably, a first stabilizing rod is further provided, a first sliding groove is arranged on the top of the base along the direction from the center to the periphery of the base corresponding to the bending part of the first bending rod, and the first stabilizing rod is vertically fixed on the bottom of the bending part of the first bending rod and is in sliding fit with the first sliding groove.

[0020] Preferably, a second stabilizing rod is further provided, a second sliding groove is arranged on the top of the base along the direction from the center to the periphery of the base corresponding to the bending part of the second bending rod, and the second stabilizing rod is vertically fixed on the bottom of the bending part of the second bending rod and is in sliding fit with the second sliding groove.

[0021] According to the technical scheme, compared with the prior art, the self-centering sand casting ball valve clamp is provided, the size of the clamping cavity formed between the plurality of jaw assemblies can be adjusted by driving the jaw assemblies to slide through the driving mechanism, so that products of multiple specifications can be clamped, the movement stroke of the jaw assemblies is expanded through the sliding connection between the components of the connecting rod mechanism, the bearing capacity is enhanced, the hydraulic cylinder is used as the driving mechanism, the stroke is convenient to control, the positioning precision is high, the clamping load capacity is large, and the clamping stability is high. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to more clearly illustrate the technical scheme in the embodiments of the present application or the prior art, the drawings needed in the following embodiment or prior art description will be briefly introduced. Obviously, the drawings in the following description are only embodiments of the present application, and other drawings can be obtained by those skilled in the art without creating any creative labor on the basis of the provided drawings.

[0023] Figure 1 A structure schematic view of one angle of the self-centering sand casting ball valve clamp provided by the utility model.

[0024] Figure 2 A structure schematic view of another angle of the self-centering sand casting ball valve clamp provided by the utility model.

[0025] Figure 3 A structure schematic view of the self-centering sand casting ball valve clamp in use.

[0026] Figure 4 A structure schematic view of another angle of the self-centering sand casting ball valve clamp in use.

[0027] In the figure: 1, base, 11, first slide rail, 12, second slide rail, 13, first slide groove, 14, second slide groove, 2, jaw assembly, 21, slide base, 22, clamping piece, 221, clamping plate, 222, support plate, 3, connecting rod mechanism, 31, sliding block, 32, first bent rod, 33, second bent rod, 34, first stabilizing rod, 35, second stabilizing rod, 4, driving mechanism, 5, limiting assembly, 51, lifting rod, 52, limiting pin, 53, mounting plate, 6, sand casting ball valve blank, 61, flange pouring riser, 62, valve body pouring riser. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the utility model.

[0029] In the description of the utility model, it is understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the utility model.

[0030] In the utility model, unless another definite provision and limitation, the terms "mount", "link", "connect", "fix" and so on terms should do broad sense understanding, for example, can be fixed connection, also can be detachable connection, or be integrated;Can be mechanical connection, also can be electrical connection;Can be direct connection, also can through intermediate medium indirectly connect, can be two element internal communication or two element's interaction relationship.For ordinary skilled person in the art, can understand the concrete meaning of above-mentioned terms in the utility model according to specific circumstances.

[0031] Please refer to Figures 1-4 The utility model discloses a kind of self-centering sand casting ball valve clamps, comprising:

[0032] Base 1;

[0033] Multiple sets of claw components 2, multiple sets of claw components 2 are evenly spaced along the circumferential direction of base 1, each set of claw components 2 is slidably installed on the top of base 1 along the direction from the center of base 1 to its periphery, and the clamping surface thereof is arranged towards the center of base 1;

[0034] Multiple connecting rod mechanisms 3, a connecting rod mechanism 3 is provided between every two adjacent sets of claw components 2, the connecting rod mechanism 3 includes a sliding block 31, a first bent rod 32 and a second bent rod 33, the sliding block 31 is slidably installed on the top of base 1 between two sets of claw components 2 along the direction from the center of base 1 to its periphery, the first bent rod 32 and the second bent rod 33 are respectively installed on the two sides of the sliding block 31 along its sliding direction, one end of the first bent rod 32 is slidably connected to the sliding block 31 along the direction perpendicular to the sliding direction of the sliding block 31, and the other end is slidably connected to the adjacent claw component 2 along the direction perpendicular to the sliding direction of the adjacent claw component 2;One end of the second bent rod 33 is slidably connected to the sliding block 31 along the direction perpendicular to the sliding direction of the sliding block 31, and the other end is slidably connected to the adjacent claw component 2 along the direction perpendicular to the sliding direction of the adjacent claw component 2;

[0035] Driving mechanism 4, the driving mechanism 4 is fixed on the base and the output end thereof is drivingly connected to any claw component 2 to drive the claw component 2 to slide.

[0036] In an embodiment, each jaw assembly 2 comprises a sliding base 21 and a clamping piece 22, and the base 1 is provided with a plurality of first sliding rails 11 which are arranged along the center to the side of the base 1, the sliding base 21 is slidingly connected to the first sliding rail 11, and any sliding base 21 is drivingly connected to the output end of the driving mechanism 4; the first bending rod 32 is slidingly connected to the corresponding sliding base 21 along the direction perpendicular to the adjacent first sliding rail 11 at the end away from the sliding block 31, and the second bending rod 33 is slidingly connected to the corresponding sliding base 21 along the direction perpendicular to the adjacent first sliding rail 11 at the end away from the sliding block 31; the clamping piece 22 is fixed on the top of the sliding base 21 and the clamping surface of the clamping piece 22 faces the center of the base 1. The driving mechanism 4 drives the sliding base 21 connected thereto to slide along the first sliding rail 11, and drives the clamping piece 22 to slide, and all the sliding bases 21 of the jaw assemblies 2 are synchronously driven to slide by the connecting rod mechanism 3 to realize the folding or unfolding of the jaw assemblies.

[0037] The top of the first sliding rail 11 is provided with a first dovetail sliding groove arranged along the center to the side of the base 1, and the bottom of the sliding base 21 is formed with a first dovetail block which is slidingly matched with the first dovetail sliding groove.

[0038] Specifically, the clamping piece 22 comprises a clamping plate 221 and a supporting plate 222, the clamping plate 221 is fixed on the top of the sliding base 21, and the clamping surface of the clamping plate 221 faces the center of the base 1, and the supporting plate 222 is arranged perpendicularly to the clamping plate 221 and is fixed on the clamping surface of the clamping plate 221. The clamping surface of the clamping plate 221 is in contact with the outer peripheral surface of the workpiece, and the supporting plate 222 is supported on the bottom of the workpiece.

[0039] In an embodiment, a limiting assembly 5 for limiting the rotation of the workpiece is further provided, the limiting assembly 5 comprises a lifting rod 51 and a limiting pin 52, and the side wall of the clamping plate 221 is fixed with a mounting plate 53 which is arranged perpendicularly to the first sliding rail 11, the bottom of the lifting rod 51 is connected to the mounting plate 53, and the limiting pin 52 is arranged perpendicularly to the first sliding rail 11 and is threadedly connected to the upper end of the lifting rod 51 at one end, and the end surface at the other end is abuttingly arranged at the pouring spout of the valve body to limit the valve body and prevent the valve body from rotating.

[0040] Specifically, the lower part of the lifting rod 51 is provided with an external thread, and the mounting plate 53 is provided with a threaded hole which is threadedly connected with the external thread. The height of the lifting rod 51 and the limiting pin 52 can be adjusted by adjusting the length of the lifting rod 51 screwed into the threaded hole, so as to adapt to ball valves of different specifications.

[0041] In an embodiment, the driving mechanism 4 is a hydraulic cylinder, the cylinder body of the hydraulic cylinder is arranged axially parallel to any first sliding rail 11, and the corresponding sliding base 21 is fixedly connected to the piston rod of the hydraulic cylinder.

[0042] In a specific embodiment, the second sliding rail 12 is fixed on the top of the base 1, and a second dovetail sliding groove is arranged on the top of the second sliding rail 12 along the direction from the center to the periphery, and the bottom of the sliding block 31 is fixed with a second dovetail block which is in sliding fit with the second dovetail sliding groove.

[0043] In a specific embodiment, the first stabilizing rod 34 is further included, and a first sliding groove 13 is arranged on the top of the base 1 corresponding to the bending position of the first bending rod 32 along the direction from the center to the periphery, and the first stabilizing rod 34 is vertically and integrally connected to the bottom of the bending position of the first bending rod 32 and is in sliding fit with the first sliding groove 13.

[0044] In a specific embodiment, the second stabilizing rod 35 is further included, and a second sliding groove 14 is arranged on the top of the base 1 corresponding to the bending position of the second bending rod 33 along the direction from the center to the periphery, and the second stabilizing rod 35 is vertically and integrally connected to the bottom of the bending position of the second bending rod 33 and is in sliding fit with the second sliding groove 14.

[0045] Working principle: as shown in Figure 3 , Figure 4 When the sand casting ball valve blank 6 is clamped by the clamp, the sand casting ball valve blank 6 is clamped from above the clamp, and the clamp assembly 2 clamps the sand casting ball valve blank from the outside. When the clamping force reaches the predetermined value, the oil pressure in the hydraulic cylinder remains stable, ensuring that the workpiece is clamped firmly. In the clamping of the sand casting ball valve, it is necessary to make any flange pouring riser 61 on the lower flange bottom end face contact with the side wall of the support plate 222. At this time, the lifting rod 51 and the limit pin 52 are adjusted to the appropriate position, the limit pin 52 is pressed tightly from the other side of the flange pouring riser 61 to the valve body pouring riser 61, and the limit pin 52 cooperates with the support plate 222 to form a circumferential clamping structure to clamp the sand casting ball valve blank 6, preventing the sand casting ball valve blank 6 from rotating.

[0046] The embodiments in the specification are described in a progressive manner, and each embodiment focuses on the difference from other embodiments. The same and similar parts between the embodiments can be referred to each other. For the device disclosed in the embodiments, since it corresponds to the method disclosed in the embodiments, the description is relatively simple, and the related parts can be referred to the method part.

[0047] The above description of disclosed embodiments enables one of ordinary skill in the art to make or use the application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein can be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A self-centering sand casting ball valve fixture, characterized in that: include: Base (1); Multiple groups of claw assemblies (2), the multiple groups of claw assemblies (2) are evenly spaced along the circumferential direction of the base (1), and each group of claw assemblies (2) is slidably mounted on the top of the base (1) along the direction from the center of the base (1) to the circumference thereof, and the clamping surfaces thereof are all arranged facing the center of the base (1); A plurality of link mechanisms (3), wherein the link mechanism (3) is provided between each two adjacent groups of the claw assemblies (2), and the link mechanism (3) comprises a slider (31), a first bending rod (32) and a second bending rod (33), wherein the slider (31) is slidably mounted on the top of the base (1) between the two groups of the claw assemblies (2) along the direction from the center of the base (1) to the circumference thereof, and the first bending rod (32) and the second bending rod (33) are respectively mounted on both sides of the slider (31) along the sliding direction thereof, one end of the first bending rod (32) is slidably connected to the slider (31) along the sliding direction perpendicular to the slider (31), and the other end is slidably connected to the adjacent claw assembly (2) along the sliding direction perpendicular to the adjacent claw assembly (2); one end of the second bending rod (33) is slidably connected to the slider (31) along the sliding direction perpendicular to the slider (31), and the other end is slidably connected to the adjacent claw assembly (2) along the sliding direction perpendicular to the adjacent claw assembly (2); A driving mechanism (4) is fixed on the base (1), and an output end of the driving mechanism (4) is connected to any one of the claw assemblies (2) to drive the claw assembly (2) to slide.

2. A self-centering sand casting ball valve fixture according to claim 1, characterized in that: Each group of the claw assemblies (2) includes a slide (21) and a clamping member (22); a plurality of first slide rails (11) are evenly spaced around the top of the base (1) and are arranged from the center to the circumference thereof; the slide (21) is slidably connected to the first slide rail (11), and any of the slides (21) is transmission-connected to the output end of the drive mechanism (4); one end of the first bending rod (32) away from the slide (31) is slidably connected to the corresponding slide (21) in a direction perpendicular to the adjacent first slide rail (11); one end of the second bending rod (33) away from the slide (31) is slidably connected to the corresponding slide (21) in a direction perpendicular to the adjacent first slide rail (11); the clamping member (22) is fixed on the top of the slide (21) and its clamping surface is arranged facing the center of the base (1).

3. The self-centering sand casting ball valve fixture according to claim 2, characterized in that: A first dovetail slot is formed on the top of the first slide rail (11) and is arranged along the center to the circumference thereof, and a first dovetail block is formed on the bottom of the slide seat (21) and is slidably engaged with the first dovetail slot.

4. The self-centering sand casting ball valve fixture according to claim 2, characterized in that: The clamping member (22) includes a clamping plate (221) and a support plate (222), wherein the clamping plate (221) is fixed on the top of the slide (21), and the clamping surface of the clamping plate (221) is arranged facing the center of the base (1), and the support plate (222) is arranged perpendicular to the clamping plate (221) and fixed on the clamping surface of the clamping plate (221).

5. The self-centering sand casting ball valve fixture according to claim 4, characterized in that: A limiting assembly (5) for limiting the rotation of the workpiece is also provided, the limiting assembly (5) comprising a lifting rod (51) and a limiting pin (52), a mounting plate (53) arranged perpendicular to the first slide rail (11) is fixed to the side wall of the clamping plate (221), the bottom of the lifting rod (51) is connected to the mounting plate (53), the limiting pin (52) is arranged perpendicular to the first slide rail (11) and one end is threadedly connected to the upper end of the lifting rod (51), and the other end can contact the workpiece.

6. The self-centering sand casting ball valve fixture according to claim 5, characterized in that: The lower portion of the lifting rod (51) is provided with an external thread, and the mounting plate (53) is provided with a threaded hole threadably connected to the external thread.

7. A self-centering sand casting ball valve fixture according to any one of claims 2 to 6, characterized in that: The driving mechanism (4) is a hydraulic cylinder, the cylinder body of the hydraulic cylinder is arranged axially parallel to any one of the first slide rails (11), and the corresponding slide seat (21) is fixedly connected to the piston rod of the hydraulic cylinder.

8. The self-centering sand casting ball valve fixture according to claim 3, characterized in that: A second slide rail (12) is fixed on the top of the base (1), a second dovetail slide groove is provided on the top of the second slide rail (12) and arranged from the center to the circumference thereof, and a second dovetail block is formed on the bottom of the slider (31) and is slidably matched with the second dovetail slide groove.

9. The self-centering sand casting ball valve fixture according to claim 1, characterized in that: It also includes a first stabilizing rod (34), and a first sliding groove (13) arranged along the center to the circumference of the first bending rod (32) is opened on the top of the base (1), corresponding to the bending part of the first bending rod (32). The first stabilizing rod (34) is vertically fixed to the bottom of the bending part of the first bending rod (32) and is slidably matched with the first sliding groove (13).

10. The self-centering sand casting ball valve fixture according to claim 9, characterized in that: It also includes a second stabilizing rod (35), and a second slide groove (14) arranged along the center to the circumference of the second bending rod (33) is opened on the top of the base (1), corresponding to the bending part of the second bending rod (33). The second stabilizing rod (35) is vertically fixed to the bottom of the bending part of the second bending rod (33) and is slidably matched with the second slide groove (14).

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