Clamp with parallel jaw adjusting device and using method thereof

Abstract

The invention discloses a clamp with a parallel jaw adjusting device and a using method thereof.The clamp comprises a winding platform, a pin shaft, two sets of four-bar mechanisms arranged in parallel, a center cross beam and a pair of clamp heads, and the adjusting device is connected between the clamp heads and the four-bar mechanisms; by means of the adjusting device, when the pair of tong heads clamp workpieces of any size, the two jaws are always kept parallel to each other. According to the clamp, the adjustable rotating block and the screw rod on the rotating block are additionally arranged on the clamp mechanism for improvement, so that external expansion and contraction of the clamp mechanism are achieved, and a large-span workpiece is clamped by adjusting the positions of the bent arm and the cutting board seat. And meanwhile, the stability of the clamp mechanism is enhanced, the jaw can be kept in a parallel state under any clamping diameter by adjusting the position of the rotating block and a screw rod on the rotating block, the contact between the workpiece and the clamp is firmer, and thus the workpiece is clamped, held and transported.

Description

Technical Field

[0001] The present invention relates to the technical field of clamps, and in particular to a clamp with a parallel jaw adjustment device and a use method thereof. Background Art

[0002] With the rapid development of national nuclear power technology and military technology, especially nuclear power technology, large castings and forgings are used more frequently, such as nuclear power upper cylinder sections, tube sheets, etc. Their blanks are all over four or five hundred tons, and the diameter is 3-8 meters. So such a casting and forging is moved to the forging workshop after casting. From the forging process to the end of forging to the machining workshop, a set of devices is needed to transport, turn over, and stand it up. At present, many companies use three sets of equipment: one is a holding clamp, the other is a turning machine, and a vertical crane is needed to lift it away. The present invention can complete its three functions at the same time, greatly reducing the production cost of the enterprise, saving production space, simplifying the process, greatly improving production efficiency, reducing the link of changing equipment in the middle, and improving production safety.

[0003] At present, there are also relatively complete mechanisms in China. The domestic parallel four-bar linkage clamp can also use the parallelogram principle to clamp the workpiece so that it does not fall. However, the overhead cranes in most factories in my country are around 500 tons. If the workpiece is also 500 tons, there will be strict restrictions on the weight of the clamp, and the weight of the clamp itself is very heavy. Secondly, for workpieces with ultra-large diameters, such as large spans of 7-9 meters, it will be more complicated if the traditional parallel four-bar linkage is used. If it is clamping a heavy-load structure, the reliability will be relatively low. Summary of the invention

[0004] The technical problem solved by the present invention is that the traditional clamps have a large weight and low reliability when clamping workpieces with extra-large diameters.

[0005] In order to solve the above-mentioned technical problems, the technical solution of the present invention provides a clamp with a parallel jaw adjustment device, wherein the clamp includes: a hoisting platform for connecting a hoisting mechanism; a pin connected to the bottom of the hoisting platform; two sets of parallel four-bar linkages, which are rotatably connected to the two ends of the pin respectively; a central crossbeam, which can be movably connected to the two sets of four-bar linkages and is located between the two sets of four-bar linkages; a pair of clamp heads, which are respectively connected to the ends of the two sets of four-bar linkages away from the pin; wherein an adjustment device is connected between the clamp heads and the four-bar linkage, and the adjustment device allows the two jaws of the pair of clamp heads to always remain parallel to each other when clamping workpieces of any size.

[0006] Optionally, each group of the four-bar linkage mechanism includes: a left tie rod and a right tie rod, the pin shaft passes through one end of the left tie rod and the right tie rod that are close to each other, and is rotatably connected to the left tie rod and the right tie rod; a left curved arm and a right curved arm, which are cross-arranged and rotatably connected to the right tie rod and the left tie rod respectively through a first rotating shaft; and a cross plate, both ends of which are rotatably connected to the middle of the left curved arm and the right curved arm respectively through a second rotating shaft, and the position is consistent with the central beam.

[0007] Optionally, a pair of the pliers heads are rotatably connected between the two left curved arms and the two right curved arms of the two groups of the four-bar linkage mechanisms through a third rotating shaft.

[0008] Optionally, the pliers head includes: an anvil seat, rotatably connected to the left curved arm or the right curved arm via the third rotating shaft; and an anvil connected to the anvil seat; wherein the surfaces of the two anvils are relatively parallel.

[0009] Optionally, the adjusting device includes: a bent arm ear plate formed at the end of the left bent arm or the right bent arm away from the pin shaft; an anvil seat ear plate formed at a position of the anvil seat close to the bent arm ear plate; a rotating block rotatably connected to the bent arm ear plate via a first rotating pin; a rotating seat rotatably connected to the anvil seat ear plate via a second rotating pin; and a bolt connected to the rotating block and the rotating seat.

[0010] Optionally, the first state of the clamp is that the bent arm ear plate and the anvil seat ear plate are both parallel to the horizontal plane, and the bolt is perpendicular to the horizontal plane. In the first state, the clamp can clamp a workpiece of standard size.

[0011] Optionally, the second state of the clamp is that the ends of the bent arm ear plate and the anvil seat ear plate are close to each other, and the top of the bolt is tilted outward, and the clamp can clamp a shortened workpiece in the second state.

[0012] Optionally, the third state of the clamp is that the ends of the bent arm ear plate and the anvil seat ear plate are away from each other, and the top of the bolt is tilted inwardly, and the clamp can clamp plus-sized workpieces in the third state.

[0013] Optionally, a pair of pin lugs for mounting the pin is provided at the bottom of the hoisting platform. To solve the above technical problems, the technical solution of the present invention also provides a method for using a clamp with a parallel jaw adjustment device according to any of the above, wherein the method of use is as follows: when it is necessary to clamp a shortened workpiece, tighten the bolts on both sides at the same time so that the ends of the bent arm lug and the anvil seat lug are close to each other, and the jaws of the two clamp heads are parallel to each other; when it is necessary to clamp an extended workpiece, loosen the bolts on both sides at the same time so that the ends of the bent arm lug and the anvil seat lug are far away from each other, and the jaws of the two clamp heads are parallel to each other; when it is necessary to clamp a standard size workpiece, tighten or loosen the bolts on both sides at the same time so that the bent arm lug and the anvil seat lug are parallel to the horizontal plane, and the jaws of the two clamp heads are parallel to each other; when it is necessary to unload the workpiece, lift the cross plate to increase the distance between the jaws of the two clamp heads so that the clamp heads leave the workpiece.

[0014] The beneficial effects of the technical solution of the present invention are: The clamp of the present invention is improved by adding an adjustable rotating block and a screw on the rotating block to the clamp mechanism, so as to realize the expansion and contraction of the clamp mechanism, and clamp a workpiece with a large span by adjusting the position of the curved arm and the anvil seat. At the same time, the stability of the clamp mechanism is enhanced, and the parallel state of the jaws under any clamping diameter is achieved by adjusting the position of the rotating block and the screw on the rotating block, so that the contact between the workpiece and the clamp is more firm, thereby completing the clamping and carrying of the workpiece. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 A schematic diagram of the initial clamping state of the clamp of the present invention;

[0016] Figure 2 for Figure 1 The structural diagram of the middle regulating device;

[0017] Figure 3 A schematic diagram of the clamp of the present invention in a contracted and clamped state;

[0018] Figure 4 for Figure 3 The structural diagram of the middle regulating device;

[0019] Figure 5 A schematic diagram of the clamp of the present invention in an expanded and clamping state;

[0020] Figure 6 for Figure 5 Schematic diagram of the structure of the regulating device.

[0021] In the attached drawings, 1, winch platform, 2, pin shaft, 3, right pull rod, 4, cross plate, 5, center beam, 6, right bent arm, 7, rotating block, 8, rotating seat, 9, bolt, 10, anvil seat, 11, anvil, 12, workpiece, 13, third rotating shaft, 14, second rotating shaft, 15, first rotating shaft, 18, bent arm ear plate, 19, anvil seat ear plate, 21, pin shaft ear plate, 31, left pull rod, 61, left bent arm. DETAILED DESCRIPTION

[0022] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments, but they are not intended to limit the present invention.

[0023] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0024] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0025] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0026] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0027] See also Figure 1 and Figure 2 As shown, a clamp with a parallel jaw adjustment device in one embodiment is shown, wherein the clamp includes a hoisting platform 1 for connecting a hoisting mechanism; a pin 2 connected to the bottom of the hoisting platform 1; two sets of parallel four-bar linkages, respectively rotatably connected to the two ends of the pin 2; a central beam 5, movably connected to the two sets of four-bar linkages and located between the two sets of four-bar linkages; a pair of clamp heads, respectively connected to the ends of the two sets of four-bar linkages away from the pin 2; wherein an adjustment device is connected between the clamp heads and the four-bar linkage, through which the two jaws of the pair of clamp heads always remain parallel to each other when clamping a workpiece 12 of any size.

[0028] In this embodiment, each four-bar linkage mechanism includes a left tie rod 31 and a right tie rod 3, the pin shaft 2 passes through one end of the left tie rod 31 and the right tie rod 3 close to each other, and is rotatably connected to the left tie rod 31 and the right tie rod 3; the left curved arm 61 and the right curved arm 6 are cross-arranged and rotatably connected to the right tie rod 3 and the left tie rod 31 respectively through the first rotating shaft 15; the cross plate 4, whose two ends are rotatably connected to the middle part of the left curved arm 61 and the right curved arm 6 respectively through the second rotating shaft 14, and the position is consistent with the central beam 5.

[0029] In this embodiment, a pair of pliers heads are rotatably connected between two left curved arms 61 and two right curved arms 6 of two sets of four-bar linkages through third rotating shafts 13 .

[0030] In this embodiment, the pliers head includes an anvil seat 10, which is rotatably connected to the left curved arm 61 or the right curved arm 6 through a third rotating shaft 13; and an anvil 11, which is connected to the anvil seat 10; wherein the surfaces of the two anvils 11 are relatively parallel.

[0031] In this embodiment, the adjusting device includes a bent arm ear plate 18, formed at the end of the left bent arm 61 or the right bent arm 6 away from the pin shaft 2; an anvil seat ear plate 19, formed at a position of the anvil seat 10 close to the bent arm ear plate 18; a rotating block 7 rotatably connected to the bent arm ear plate 18; a rotating seat 8 rotatably connected to the anvil seat ear plate 19; and a bolt 9 connected to the rotating block 7 and the rotating seat 8.

[0032] In this embodiment, the first state of the clamp is that the bent arm ear plate 18 and the anvil seat ear plate 19 are both parallel to the horizontal plane, and the bolt 9 is perpendicular to the horizontal plane. In the first state, the clamp can clamp a standard size workpiece 12.

[0033] In this embodiment, the second state of the clamp is that the ends of the bent arm ear plate 18 and the anvil seat ear plate 19 are close to each other, and the top of the bolt 9 is tilted outward. In the second state, the clamp can clamp the shortened workpiece 12.

[0034] In this embodiment, the third state of the clamp is that the ends of the bent arm ear plate 18 and the anvil seat ear plate 19 are away from each other, and the top of the bolt 9 is inclined inward. In the third state, the clamp can clamp the oversized workpiece 12.

[0035] In this embodiment, a pair of pin lugs 21 for mounting the pin 2 are provided at the bottom of the hoisting platform 1 .

[0036] This embodiment also provides a method for using any of the above-mentioned pliers with parallel jaw adjustment devices, wherein the method for using is as follows:

[0037] like Figure 3 and Figure 4 As shown, when it is necessary to clamp a shortened workpiece 12, the bolts 9 on both sides are tightened at the same time so that the ends of the bent arm ear plate 18 and the anvil seat ear plate 19 are close to each other, and the jaws of the two pliers are parallel to each other;

[0038] like Figure 5 and Figure 6 As shown, when it is necessary to clamp the lengthened workpiece 12, the bolts 9 on both sides are loosened at the same time so that the ends of the bent arm ear plate 18 and the anvil seat ear plate 19 are moved away from each other, and the jaws of the two pliers are parallel to each other;

[0039] like Figure 1 and Figure 2 As shown, when a standard-sized workpiece 12 needs to be clamped, the bolts 9 on both sides are tightened or loosened at the same time so that the bent arm ear plate 18 and the anvil seat ear plate 19 are both parallel to the horizontal plane, and the jaws of the two pliers are parallel to each other;

[0040] When the workpiece needs to be unloaded, the horizontal plate 4 can be lifted to increase the distance between the jaws of the two clamps so that the clamps are separated from the workpiece 12 .

[0041] The characteristics and functions of the present invention will be further understood through the following description.

[0042] The clamp of this embodiment has two main purposes. First, by adding an adjustable rotating block and a screw on the rotating block to the clamp mechanism, the clamp mechanism can be expanded and contracted, and a large-span workpiece can be clamped by adjusting the position of the curved arm and the anvil seat. Second, the stability of the clamp mechanism is enhanced. By adjusting the position of the rotating block and the screw on the rotating block, the jaws can be kept parallel under any clamping diameter, and the contact between the workpiece and the clamp is more firm, thereby completing the clamping and carrying of the workpiece.

[0043] The clamp of this embodiment does not need to add a four-bar linkage mechanism, which saves a lot of weight. Secondly, for workpieces with extra-large diameters, such as workpieces with a large span of 7-9 meters, the position of the rotating block and the bolts on the rotating block can be adjusted to achieve a parallel state at any clamping diameter of the jaws. The clamp can lift and lower the workpiece to achieve transportation, turning over, and standing up. It is not only convenient and simple to operate, but can even save a lot of cost. The clamp of this embodiment has a large clamping span, which makes it more convenient to clamp workpieces with too large diameters, and the jaws always remain in a balanced state to clamp the workpiece more firmly and accurately.

[0044] The clamp of this embodiment can solve the problems of large span, too large diameter, inconvenient lifting and lowering of workpieces, etc. Its structure, components and working principle are as follows:

[0045] Using the principle of levers, the left and right arms are used to clamp forgings. Before lifting, the opening angles of the anvil and the anvil seat are adjusted by tightening bolts according to the length of the workpiece. The 7-meter workpiece is clamped so that the jaws can be in a parallel state and accurately clamped between the two arms. The main hook lifts the boom pin, the left and right arms are tightened, and the anvil contacts the workpiece. Due to the parallel four-bar linkage, the jaws remain parallel during the tightening process. After clamping the workpiece, lift the workpiece and carry it to the designated location. When unloading the workpiece, the main hook lifts the chain connected to the arm to open the jaws to disengage the jaws and complete the unloading. The fixture is used to vertically clamp one end of the workpiece. Under the action of the end frame's own weight, the pin between the anvil and the anvil seat rotates, and the vertical positioning is completed as the hook is gradually lifted. From Figure 4 From the adjustment of the position of the anvil seat, it can be seen that this is a parallel jaw adjustment device structure that integrates multiple types of clamps.

[0046] In summary, the clamp of the present invention is improved by adding an adjustable rotating block and a screw on the rotating block to the clamp mechanism to achieve the expansion and contraction of the clamp mechanism, and to clamp a large-span workpiece by adjusting the position of the curved arm and the anvil seat. At the same time, the stability of the clamp mechanism is enhanced, and by adjusting the position of the rotating block and the screw on the rotating block, the parallel state of the jaws can be maintained at any clamping diameter, and the contact between the workpiece and the clamp is more firm, thereby completing the clamping and carrying of the workpiece.

[0047] The above are only preferred embodiments of the present invention, and are not intended to limit the implementation methods and protection scope of the present invention. Those skilled in the art should be aware that all solutions obtained by equivalent substitutions and obvious changes made using the description and illustrations of the present invention should be included in the protection scope of the present invention.

Claims

1. A clamp with a parallel jaw adjustment device, characterized in that: The clamp comprises: A hoisting platform, used to connect the hoisting mechanism; a pin shaft, connected to the bottom of the hoisting platform; Two sets of four-bar linkages arranged in parallel are rotatably connected to both ends of the pin shaft respectively; A central crossbeam, movably connected to the two sets of the four-bar linkage mechanisms and located between the two sets of the four-bar linkage mechanisms; A pair of pliers are respectively connected to the ends of the two groups of four-bar linkages away from the pin shaft; An adjusting device is connected between the pliers head and the four-bar linkage mechanism, and the adjusting device enables the two jaws of the pair of pliers heads to always remain parallel to each other when clamping workpieces of any size.

2. The pliers with parallel jaw adjustment device according to claim 1, characterized in that: Each set of the four-bar linkage comprises: A left pull rod and a right pull rod, wherein the pin passes through one end of the left pull rod and the right pull rod that are close to each other, and is rotatably connected to the left pull rod and the right pull rod; The left curved arm and the right curved arm are cross-arranged and rotatably connected to the right pull rod and the left pull rod respectively through a first rotating shaft; The two ends of the transverse plate are rotatably connected to the middle parts of the left curved arm and the right curved arm through second rotating shafts, and the positions are consistent with the central cross beam.

3. The pliers with parallel jaw adjustment device according to claim 2, characterized in that: A pair of the pliers heads are rotatably connected between the two left curved arms and the two right curved arms of the two groups of the four-bar linkages through a third rotating shaft.

4. The pliers with parallel jaw adjustment device according to claim 3, characterized in that: The pliers head comprises: an anvil seat, rotatably connected to the left curved arm or the right curved arm via the third rotating shaft; and an anvil, connected to the anvil seat; wherein the surfaces of the two anvils are relatively parallel.

5. The pliers with parallel jaw adjustment device according to claim 4, characterized in that: The regulating device comprises: A bent arm ear plate, formed at the end of the left bent arm or the right bent arm away from the pin shaft; Anvil block seat ear plate, formed at a position of the anvil block seat close to the bent arm ear plate; A rotating block rotatably connected to the bent arm ear plate via a first rotating pin; A rotating seat rotatably connected to the anvil seat ear plate via a second rotating pin; and Bolts are connected to the rotating block and the rotating seat.

6. The pliers with parallel jaw adjustment device according to claim 5, characterized in that: The first state of the clamp is that the bent arm ear plate and the anvil seat ear plate are both parallel to the horizontal plane, and the bolt is perpendicular to the horizontal plane. In the first state, the clamp can clamp a workpiece of standard size.

7. The pliers with parallel jaw adjustment device according to claim 6, characterized in that: The second state of the clamp is that the ends of the bent arm ear plate and the anvil seat ear plate are close to each other, and the top of the bolt is inclined outward. In the second state, the clamp can clamp a shortened workpiece.

8. The pliers with parallel jaw adjustment device according to claim 7, characterized in that: The third state of the clamp is that the ends of the bent arm ear plate and the anvil block seat ear plate are away from each other, and the top of the bolt is inclined inwardly. In the third state, the clamp can clamp plus-sized workpieces.

9. The pliers with parallel jaw adjustment device according to claim 8, characterized in that: A pair of pin shaft ear plates for installing the pin shaft are provided at the bottom of the hoisting platform.

10. A method for using the pliers with parallel jaw adjustment device according to any one of claims 1 to 9, characterized in that: The method of use is as follows: When it is necessary to clamp a shortened workpiece, tighten the bolts on both sides at the same time so that the ends of the bent arm ear plate and the anvil seat ear plate are close to each other, and the jaws of the two clamp heads are parallel to each other; When it is necessary to clamp a workpiece with an extended size, loosen the bolts on both sides at the same time so that the ends of the bent arm ear plate and the anvil seat ear plate are separated from each other, and the jaws of the two clamp heads are parallel to each other; When it is necessary to clamp a workpiece of standard size, tighten or loosen the bolts on both sides at the same time so that the bent arm ear plate and the anvil seat ear plate are parallel to the horizontal plane, and the jaws of the two clamp heads are parallel to each other; When the workpiece needs to be unloaded, the horizontal plate can be lifted to increase the distance between the jaws of the two clamps so that the clamps are separated from the workpiece.

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