Clamping tool for sand casting ball valve blank

Abstract

The clamping tool for the sand casting ball valve blank comprises an air cylinder, a fixing plate, a driving disc, a driving rod, a driven rod and a clamping jaw, and the fixing plate is fixedly arranged on the peripheral face of a cylinder body of the air cylinder in a sleeving mode; a plurality of racks parallel to the axis of the piston rod are fixed on the peripheral wall of the driving disc; the number of the driving rods is multiple, sector gears are fixed to one ends of the multiple driving rods, the tooth ends of the multiple sector gears are meshed with the multiple racks in a one-to-one correspondence mode, and the connecting positions of the sector gears and the driving rods are rotationally connected to the bottom face of the fixing plate; a rod body of the driven rod is fixed at the other end of the driving rod; the clamping jaw is fixed to one end of the driven rod so as to clamp a sand casting ball valve blank. The clamping device has the advantages of being large in load, large in stroke and accurate in positioning, can flexibly clamp ball valves of multiple varieties and specifications, and is wider in application range.

Description

Technical Field

[0001] The invention relates to the technical field of ball valve processing equipment, and more particularly to a clamping tool for sand casting ball valve blanks. Background Art

[0002] The sand-cast ball valve blank has large dimensional deviations and usually weighs several hundred kilograms. Its complex pouring and riser structure means that the sand-cast ball valve has fewer positioning surfaces that can be used for clamping. The design of the clamp faces the dual challenges of precise positioning and bearing large loads.

[0003] The main types of grippers on the market are pneumatic grippers and electric grippers. The gripping force of electric grippers is relatively small, and they are not suitable for gripping heavy sand-cast ball valve blanks. Pneumatic grippers generally use a wedge-shaped block structure, and their stroke is relatively small. Moreover, the above-mentioned grippers rely on the friction between the fingers and the workpiece to complete the gripping. For heavy sand-cast ball valve blanks, it is difficult to complete the gripping task by friction alone. In addition, the existing large gripping force grippers rarely have a force feedback function. Therefore, it is difficult to ensure that the gripping force provided by the grippers can effectively and stably grip heavy workpieces, resulting in certain safety hazards.

[0004] Therefore, how to provide a clamping device that can effectively and stably clamp sand-cast ball valve blanks and has a large load and a large stroke is a problem that technical personnel in this field urgently need to solve. Summary of the invention

[0005] In view of this, the present invention provides a clamping tool for sand-cast ball valve blanks, which increases the clamping stroke of the equipment by utilizing the telescopic cylinder piston rod, and multiple clamping claws increase the load of the clamping tool by clamping the blank.

[0006] In order to achieve the above object, the present invention adopts the following technical solution:

[0007] A clamping tool for a sand-cast ball valve blank, comprising:

[0008] cylinder,

[0009] A fixing plate, the fixing plate is sleeved and fixed on the outer peripheral surface of the cylinder body of the cylinder;

[0010] A driving plate, the middle portion of which is fixed to the piston rod of the cylinder, and a plurality of racks arranged parallel to the axis of the piston rod are fixed to the outer peripheral wall of the driving plate;

[0011] Active rods, the number of active rods is multiple, one end of each of the multiple active rods is fixed with a sector gear, the tooth ends of the multiple sector gears are meshed with the multiple racks in a one-to-one correspondence, and the connection between the sector gear and the active rod is rotatably connected to the bottom surface of the fixed plate;

[0012] A driven rod, the rod body of which is hingedly connected to the other end of the active rod;

[0013] A clamping jaw is fixed to one end of the driven rod to clamp the sand cast ball valve blank.

[0014] The beneficial effect of the above technical solution is that in the initial state, the piston rod extends out of the cylinder. When the sand-cast ball valve blank needs to be clamped, the piston rod drives the driving disk to move along the inner direction of the cylinder. The driving disk will drive the fan gear to move during the movement. The fan gear drives one end of the active rod to rotate relative to the driving disk. In this state, the clamping claw is close to the sand-cast ball valve blank to clamp it; the present invention converts the linear motion of the piston rod into the rotational motion of the active rod, and the rotational motion of the active rod is converted into the translational motion of the driven rod. The translational motion of the driven rod drives the clamping claw to translate and then clamp the sand-cast ball valve blank, effectively ensuring the stability of clamping the sand-cast ball valve blank; the extension and contraction amount of the cylinder piston rod is used as the clamping stroke of the clamping claw, and multiple clamping claws can cooperate to hold the blank tightly, and do not rely solely on friction for clamping, thereby increasing the load of the clamping tooling.

[0015] Preferably, the bottom surfaces of the fixed plate corresponding to the plurality of racks are all fixed with connecting plates, and the fixed end of the sector gear is hinged to one end of the connecting plate away from the fixed plate. The connecting plate enables the active rod to be rotatably connected to the bottom surface of the fixed plate, and when the driving plate drives the rack to move up and down, the meshing of the sector gear and the rack can drive the active rod to rotate along the connecting plate.

[0016] Preferably, a connecting rod is further included, one end of which is hinged to the side wall of the fixing plate, and the other end is hinged to the end of the driven rod away from the clamping claw. On the one hand, the connecting rod can support the driven rod to ensure the structural strength of the clamping tooling, and on the other hand, after the active rod rotates, it can drive the connecting rod and the driven rod to perform translational motion at the same time, thereby pushing the clamping claw close to the sand casting ball valve blank to clamp it.

[0017] Preferably, the clamp has a fixed end and a claw end, wherein the fixed end is bolted to one end of the active rod, and the claw end abuts against the bottom surface of the flange of the sand-cast ball valve blank. The clamp can firmly clamp the flange of the sand-cast ball valve blank, and the clamping of the sand-cast ball valve blank by the clamp does not rely solely on the friction between the clamp and the workpiece, so that the clamping tool can meet the use requirements of the heavy sand-cast ball valve blank.

[0018] Preferably, a support block is provided on the top surface of the jaw end of the clamp, and a spring is fixed between the bottom surface of the support block and the top surface of the jaw end of the clamp. When the clamp clamps the blank, the support block also contacts the blank to provide necessary support for the blank, ensuring the coordination of the blank during the clamping process, and the spring can ensure the flexible support capacity of the support.

[0019] Preferably, the end of the clamping claw is provided with a plurality of sliding holes, a sliding rod passes through the sliding holes and one end of the sliding rod is fixed to the bottom surface of the support block, the rod wall of the sliding rod is in sliding contact with the inner wall of the sliding hole; the spring is sleeved on the sliding rod. After the blank is in contact with the support block, the spring will be compressed under the action of the clamping force, and the support block moves downward with the compression of the spring. The stability of the support block during movement can be ensured by the sliding rod.

[0020] Preferably, a sawtooth block is fixed on the fixed end of the clamping jaw facing the side end surface of the sand-cast ball valve blank, thereby increasing the friction coefficient between the clamping jaw and the flange of the blank and ensuring stability during the clamping process.

[0021] Preferably, a pressure sensor is fixed on the clamping jaw. The pressure sensor can detect and feedback the clamping force applied by the clamping jaw on the blank in real time. With the force feedback function of the pressure sensor, the operator can control the clamping force of the clamping jaw by adjusting the exhaust volume of the cylinder, ensuring that the blank will not be damaged due to excessive clamping force, nor will it fall due to insufficient clamping force, thereby achieving effective and stable grasping of the blank.

[0022] Preferably, a flange is fixed to the end face of the cylinder relative to the piston rod, the panel of the fixing plate is bolted to the flange, and the piston rod passes through the panel of the fixing plate. The detachable connection method facilitates the repair and maintenance of the clamping tooling.

[0023] Preferably, the number of the racks is three, and the three racks are arranged in an array along the circumference of the driving disk. The three clamping jaws simultaneously clamp the blank, effectively ensuring stability during the clamping process.

[0024] It can be seen from the above technical scheme that compared with the prior art, the present invention discloses a clamping tool for sand-cast ball valve blanks, which has the advantages of large load, large stroke and precise positioning, and the pressure sensor on the clamp can monitor the size of the gripping force in real time to ensure the effective and stable clamping of the sand-cast ball valve blank; it can flexibly clamp ball valves of various varieties and specifications, and has a wider range of uses. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0026] Figure 1 A schematic diagram of the structure of the clamping tool provided by the present invention;

[0027] Figure 2 A schematic diagram of the structure of the clamping tooling jaws provided by the present invention;

[0028] Figure 3 for Figure 2 A magnified schematic diagram of part A in FIG.

[0029] Figure 4 This is a schematic diagram of the structure of a clamping tool for clamping a sand-cast ball valve provided by the present invention.

[0030] in,

[0031] 1-cylinder; 11-piston rod; 2-fixed plate; 21-connecting plate; 3-driving plate; 31-rack; 4-active rod; 41-sector gear; 5-driven rod; 6-clamp; 61-support block; 62-spring; 63-serrated block; 64-sliding rod; 7-connecting rod; 8-pressure sensor; 9-flange. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] See attached Figures 1 to 4 The embodiment of the present invention discloses a clamping tool for a sand-cast ball valve blank, comprising:

[0034] Cylinder 1,

[0035] A fixing plate 2, the fixing plate 2 is sleeved and fixed on the outer peripheral surface of the cylinder 1;

[0036] A driving plate 3, the middle portion of which is fixed to the piston rod 11 of the cylinder 1, and a plurality of racks 31 arranged parallel to the axis of the piston rod 11 are fixed to the outer peripheral wall of the driving plate 3;

[0037] Active rods 4, there are multiple active rods 4, one end of each of the multiple active rods 4 is fixed with a sector gear 41, the tooth ends of the multiple sector gears 41 are meshed with the multiple racks 31 in a one-to-one correspondence, and the connection between the sector gear 41 and the active rod 4 is rotatably connected to the bottom surface of the fixed plate 2;

[0038] A driven rod 5, the rod body of the driven rod 5 is hinged to the other end of the active rod 4;

[0039] The clamping jaw 6 is fixed to one end of the driven rod 5 to clamp the sand casting ball valve blank.

[0040] like Figure 1As shown, the fan gear is meshed with the rack and is rotatably connected to the bottom surface of the fixed plate. The driving plate moves up and down with the piston rod. When the blank needs to be clamped, the piston rod moves upward to drive the fixed plate to drive the rack to move upward. During the movement, the rack is meshed with the fan gear, and the fan gear drives the active rod to rotate along the bottom surface of the fixed plate. The rotational motion of the active rod will be converted into the translational motion of the driven rod. The translational motion of the driven rod will make the clamping claws approach the blank to clamp it.

[0041] In order to further optimize the above technical solution, a connecting plate 21 is fixed to the bottom surface of the fixed plate 2 corresponding to the multiple racks 31 , and the fixed end of the sector gear 41 is hinged to one end of the connecting plate 21 away from the fixed plate 2 .

[0042] The connecting plates are arranged symmetrically, and one end of each connecting plate is clamped on both sides of the connecting node between the active rod and the sector gear, and is fastened by bolts so that it can rotate relative to the connecting plate.

[0043] The connection node between the sector gear and the active rod is hinged to one end of the connecting plate, so as to ensure that the active rod can rotate when the rack moves up and down to engage with the sector gear.

[0044] In order to further optimize the above technical solution, a connecting rod 7 is further included, one end of which is hinged to the side wall of the fixing plate 2 , and the other end of which is hinged to the end of the driven rod 5 away from the clamping claw 6 .

[0045] In order to further optimize the above technical solution, the clamping jaw 6 has a fixed end and a claw end, wherein the fixed end is bolted to one end of the active rod 4, and the claw end abuts against the bottom surface of the flange of the sand-cast ball valve blank.

[0046] In this embodiment, there are three racks 31, which are arranged in an array along the circumference of the driving disk 3. The three clamping claws can stably hold the bottom surface of the flange of the blank, ensuring stability during the clamping process; the fixed plate is a circular plate, and the number of connecting plates is three groups, which are arranged in an array along the bottom surface of the fixed plate, corresponding to the three racks one by one.

[0047] In this embodiment, there are two driven rods that are arranged opposite to each other. The top end between the two opposite side walls of the two driven rods clamps one end of the connecting rod, the middle part clamps one end of the active rod, and the bottom end clamps the clamping claw, all of which are fastened by bolts. The axis of the active rod is arranged parallel to the axis of the connecting rod. In this way, when the fan gear drives the active rod to rotate, the connecting rod also rotates as a driven motion. The rotation of the connecting rod and the active rod is converted into the translation of the driven rod, thereby enabling the clamping claw to clamp the blank.

[0048] The connecting rod makes the clamping tool form a four-bar mechanism, which ensures the overall structural strength of the clamping tool and enables it to have a larger load. The extension and retraction of the cylinder piston rod makes the clamping tool have a larger measuring range. By converting the rotational motion of the active rod into the translational motion of the driven rod, the clamping tool can automatically perform fixed-point clamping of the blank.

[0049] In order to further optimize the above technical solution, a support block 61 is provided on the top surface of the jaw end of the clamping jaw 6 , and a spring 62 is fixed between the bottom surface of the support block 61 and the top surface of the jaw end of the clamping jaw 6 .

[0050] When the clamping jaws hold the blank, the blank contacts the top surface of the support block. The support block can support the blank to ensure coordination during the clamping process of the blank. The support of the support block is made flexible by the spring.

[0051] In order to further optimize the above technical solution, a plurality of sliding holes are opened at the claw end of the clamp 6, a sliding rod 64 passes through the sliding hole and one end of the sliding rod 64 is fixed to the bottom surface of the support block 61, and the rod wall of the sliding rod 64 slides against the inner wall of the sliding hole; a spring 62 is sleeved on the sliding rod 64.

[0052] like Figure 3 As shown, the rod end of the sliding rod is slidably connected in the sliding hole, and one end of the sliding rod is fixed to the bottom surface of the support block, and the other end of the sliding rod extends out of the bottom surface of the claw end of the clamping jaw and is fixed with a nut. The nut limits the sliding of the sliding rod to prevent it from escaping from the sliding hole; the spring is sleeved on the sliding rod, and the sliding rod will synchronously slide downward along the sliding hole when the spring is compressed. When the clamping jaw releases the blank, the support block is reset under the action of the spring force and drives the sliding rod to slide upward along the sliding hole. Through the setting of the sliding rod, the stability of the support block during the clamping operation of the clamping tool on the blank can be effectively guaranteed, thereby ensuring that the clamping operation is carried out smoothly and effectively.

[0053] In order to further optimize the above technical solution and improve the friction coefficient between the clamping jaws and the blank, a sawtooth block 63 is fixed to the side end surface of the fixed end of the clamping jaw 6 facing the sand casting ball valve blank.

[0054] In order to further optimize the above technical solution and ensure that the clamping force can be fed back when the workpiece is clamped, a pressure sensor 8 is fixed on the clamping jaw 6.

[0055] The principle of the present invention is:

[0056] The piston rod is in an extended state under normal conditions. During use, the cylinder is inhaled and exhausted through the air circuit to prepare for clamping the sand-cast ball valve blank.

[0057] As the air pressure in the cylinder decreases, the piston rod contracts into the cylinder under the action of air pressure, driving the driving plate to move synchronously. The driving plate and the four-bar linkage mechanism engage with the sector gear and the rack to convert the linear motion of the piston rod into the rotational motion of the active rod. Then the active rod drives the connecting rod and the driven rod to move. The connecting rod rotates with the rotation of the active rod. The driven rod converts the rotation of the active rod and the connecting rod into translational motion, causing the clamping claw to perform translational motion, thereby realizing the clamping action of the sand-cast ball valve blank.

[0058] While the clamping jaws hold the sand-cast ball valve blank, the support block contacts the sand-cast ball valve blank to provide necessary support for the sand-cast ball valve blank, thereby ensuring the coordination and stability of the sand-cast ball valve blank during the clamping process.

[0059] The pressure sensor detects and feeds back the clamping force applied by the clamping jaws on the sand-cast ball valve blank in real time. The operator controls the clamping force of the clamping jaws by adjusting the exhaust volume of the cylinder based on the feedback information to ensure that the sand-cast ball valve blank will not be damaged due to excessive clamping force, nor will it fall due to insufficient clamping force.

[0060] The clamp successfully clamps the sand-cast ball valve blank. During the transfer process, the clamp maintains appropriate clamping force to ensure that the sand-cast ball valve blank will not fall due to vibration or collision during transportation.

[0061] In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part.

[0062] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A clamping tool for sand casting ball valve blanks, characterized in that: include: Cylinder (1), A fixing plate (2), the fixing plate (2) being sleeved and fixed on the outer peripheral surface of the cylinder body of the cylinder (1); A driving plate (3), the middle portion of which is fixed to the piston rod (11) of the cylinder (1), and a plurality of racks (31) arranged parallel to the axis of the piston rod (11) are fixed to the outer peripheral wall of the driving plate (3); An active rod (4), wherein the active rods (4) are in plurality, and a sector gear (41) is fixed at one end of each of the plurality of active rods (4), and the tooth ends of the plurality of sector gears (41) are meshed with the plurality of racks (31) in a one-to-one correspondence, and the connection between the sector gear (41) and the active rod (4) is rotatably connected to the bottom surface of the fixed plate (2); A driven rod (5), the rod body of the driven rod (5) being hinged to the other end of the active rod (4); A clamping jaw (6) is fixed to one end of the driven rod (5) to clamp the sand-cast ball valve blank.

2. A clamping tool for sand casting ball valve blank according to claim 1, characterized in that: A connecting plate (21) is fixed to the bottom surface of each of the fixing plate (2) corresponding to the plurality of racks (31), and a fixed end of the sector gear (41) is hinged to an end of the connecting plate (21) away from the fixing plate (2).

3. The clamping tool for sand casting ball valve blank according to claim 1, characterized in that: It also comprises a connecting rod (7), one end of which is hinged to the side wall of the fixing plate (2), and the other end of which is hinged to an end of the driven rod (5) away from the clamping claw (6).

4. The clamping tool for sand casting ball valve blank according to claim 1, characterized in that: The clamping claw (6) has a fixed end and a claw end, wherein the fixed end is bolted to one end of the active rod (4), and the claw end abuts against the bottom surface of the flange of the sand-cast ball valve blank.

5. The clamping tool for sand casting ball valve blank according to claim 4, characterized in that: A support block (61) is provided on the top surface of the claw end of the clamping jaw (6), and a spring (62) is fixed between the bottom surface of the support block (61) and the top surface of the claw end of the clamping jaw (6).

6. A clamping tool for sand casting ball valve blank according to claim 5, characterized in that: The claw end of the clamp (6) is provided with a plurality of sliding holes, a sliding rod (64) passes through the sliding holes and one end of the sliding rod (64) is fixed to the bottom surface of the support block (61), and the rod wall of the sliding rod (64) is in sliding contact with the inner wall of the sliding hole; the spring (62) is sleeved on the sliding rod (64).

7. The clamping tool for sand casting ball valve blank according to claim 5, characterized in that: A sawtooth block (63) is fixed on the fixed end of the clamping jaw (6) facing the side end surface of the sand-cast ball valve blank.

8. The clamping tool for sand casting ball valve blank according to claim 1, characterized in that: A pressure sensor (8) is fixed on the clamping jaw (6).

9. The clamping tool for sand casting ball valve blank according to claim 1, characterized in that: A flange (9) is fixed to the end surface of the cylinder (1) relative to the piston rod (11); the panel of the fixing plate (2) is bolted to the flange (9); and the piston rod (11) passes through the panel of the fixing plate (2).

10. The clamping tool for sand casting ball valve blank according to claim 1, characterized in that: The number of the racks (31) is three, and the three racks (31) are arranged in an array along the circumference of the driving disk (3).

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