Adjustable shaft clamp

Abstract

The utility model relates to a shaft clamp, in particular to an adjustable shaft clamp, and aims to solve the problems that a clamp needs to be reinstalled on a machine tool every time when products are switched under the condition of frequent product switching, operation is strenuous, time is wasted, the efficiency of a single-station clamp is low, and the production efficiency is high. The clamping force is inconsistent in the manual clamping process, and the clamping process is tedious to operate. The fixture comprises a body and a clamping module, the clamping module comprises a first supporting block, a second supporting block, a circumferential positioning mechanism and a pair of pressing mechanisms. A first positioning structure is arranged on the body and comprises two rows of first positioning holes; the second supporting block is provided with two first bolts, and the two first bolts are connected with one first positioning hole in the two rows of first positioning holes respectively. Two first sliding grooves are formed in the second supporting block, and screw rods of the two first bolts are arranged in the two first sliding grooves in a penetrating mode correspondingly. The two ends of the shaft to be machined are clamped to the first supporting block and the second supporting block through the pair of pressing mechanisms.

Description

Technical Field

[0001] This utility model relates to a shaft clamp, specifically an adjustable shaft clamp. Background Technology

[0002] For gearbox shaft assemblies, pins are needed to restrict the circumferential rotation of bushing-type parts. A common practice is to machine pin holes on the shaft, hammer the pins into the holes, and then rivet them. Existing shaft fixtures are generally single-station, manual fixtures. A pair of manual clamping mechanisms clamps the positioning parts at both ends of the shaft to be processed onto the fixture. These fixtures have poor compatibility, and the wide variety of commonly used shaft assemblies results in a large number of corresponding fixtures required. Therefore, with frequent product changes, the fixtures must be reinstalled on the machine tool each time a product type is switched, which is not only laborious but also time-consuming. Single-station fixtures also suffer from low efficiency. Furthermore, manual clamping can lead to inconsistent clamping force and cumbersome clamping procedures.

[0003] Chinese utility model patent CN216503656 discloses a four-axis dual-station hydraulic clamp with uniform force, including a base plate and positioning pins mounted on the base plate, a first clamping mechanism, and a second clamping mechanism. Two second clamping mechanisms are arranged side-by-side in an isosceles triangle with the first clamping mechanism. Two positioning pins are located between the first and second clamping mechanisms. The positioning pins, first clamping mechanism, and second clamping mechanism are arranged in two sets. However, this utility model is only used for clamping sheet-like parts.

[0004] Chinese utility model patent CN216503656 discloses a dual-station hydraulic clamp, including a base plate, a clamp body on top of the base plate, cylinder supports on both sides of the clamp body, two rotary cylinders on the cylinder supports, pressure plates at the stroke ends of the rotary cylinders, an auxiliary support cylinder on one side of the cylinder support, a sequence valve on the side of the auxiliary support cylinder away from the cylinder support, a pressure reducing valve above the cylinder support above the clamp body, and a reversing valve below the cylinder support below the clamp body. Pressure testing connectors are located on both sides of the clamp body above the base plate. However, this utility model is not suitable for clamping shaft-type parts. Utility Model Content

[0005] The purpose of this utility model is to solve the technical problems of existing shaft fixtures being numerous, requiring reinstallation of fixtures on the machine tool every time a product is switched, which is not only laborious and time-consuming, but also inefficient for single-station fixtures, and involves inconsistent clamping force and cumbersome operation during manual clamping. Therefore, this utility model provides an adjustable shaft fixture.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0007] An adjustable shaft clamp, characterized by:

[0008] Includes the main body and at least one assembly clip module disposed on the main body;

[0009] The clamping module includes a first support block, a second support block, a circumferential positioning mechanism, and a pair of clamping mechanisms; the first support block and the second support block are detachable and spaced apart along the length of the body.

[0010] The main body is provided with a first positioning structure that corresponds to and cooperates with the clamping module. The first positioning structure includes two rows of first positioning holes spaced apart along the width direction of the main body, and all the first positioning holes in the same row are spaced apart along the length direction of the main body.

[0011] The second support block is provided with two first bolts, which are respectively connected to one of the first positioning holes in the two rows of first positioning holes; the second support block is provided with two first sliding grooves extending along the length of the body, and the screws of the two first bolts are respectively inserted into the two first sliding grooves;

[0012] Let L be the length of the first groove, M be the distance between the central axes of two adjacent first positioning holes in the same row, and D be the diameter of the first positioning hole. Then L ≥ M + D.

[0013] Both the circumferential positioning mechanism and the pair of clamping mechanisms are mounted on the main body; the circumferential positioning mechanism is used to circumferentially position the shaft to be processed; the pair of clamping mechanisms cooperate with the first support block and the second support block respectively to clamp the positioning parts at both ends of the shaft to be processed onto the first support block and the second support block respectively.

[0014] Furthermore, a first V-shaped groove is provided on the top of the first support block, and the two ends of the first V-shaped groove penetrate the first support block along the length direction of the body. The first V-shaped groove is used to support the positioning part of one end of the shaft to be processed.

[0015] The surface of the first support block near the second support block is the first positioning surface. The first positioning surface is used to axially position the shaft to be processed. The first positioning surface is a finishing surface.

[0016] The top of the second support block is provided with a second V-shaped groove. The two ends of the second V-shaped groove penetrate the second support block along the length of the body. The symmetrical planes of the two sides of the second V-shaped groove coincide with the symmetrical planes of the two sides of the first V-shaped groove. The second V-shaped groove is used to support the positioning part of the other end of the shaft to be processed.

[0017] After the positioning parts at both ends of the shaft to be processed are placed on the first V-groove and the second V-groove respectively, the central axis of the positioning parts at both ends of the shaft to be processed is parallel to the upper surface of the body.

[0018] Furthermore, quick-change blocks are installed on both sides of the first V-groove and both sides of the second V-groove;

[0019] The upper and lower surfaces of the quick-change block are parallel, and the lower surface of the quick-change block is in contact with the side of the first V-groove or the side of the second V-groove.

[0020] The quick-change block is provided with a second positioning surface, wherein the second positioning surface and the first positioning surface on the quick-change block mounted on the first support block are located in the same plane; the second positioning surface is a precision-machined surface.

[0021] The quick-change block is provided with a pair of first pin holes. After passing through the pair of first pin holes, the pair of pins extend into a pair of second pin holes on the first support block or into a pair of third pin holes on the second support block.

[0022] A pair of first pin holes are asymmetrically arranged on the quick-change block.

[0023] Furthermore, the circumferential positioning mechanism includes a positioning block and a V-shaped positioning block;

[0024] The positioning block is detachably mounted on the body and located between the first support block and the second support block. The end face of the positioning block near the first support block is the third positioning surface. The third positioning surface is a precision-machined surface and fits against the first positioning surface.

[0025] The V-shaped positioning block is rotatably mounted on the positioning block and can be adjusted up and down. The top of the V-shaped positioning block is provided with a third V-shaped groove, which is used to lock onto the teeth of the shaft to be processed.

[0026] Furthermore, the top of the positioning block is provided with a guide hole, and the central axis of the guide hole is located in the plane of symmetry of the two sides of the second V-shaped groove. The V-shaped positioning block is rotatably and vertically positioned in the guide hole, and the upper end of the V-shaped positioning block extends upward out of the guide hole.

[0027] The circumferential positioning mechanism also includes a spring and an adjusting screw plug, with the spring disposed in the guide hole and located below the V-shaped positioning block;

[0028] The bottom surface of the positioning block is provided with a first threaded hole. The upper end of the first threaded hole is connected to the lower end of the guide hole. The adjusting plug is threaded into the first threaded hole. The lower end of the spring extends into the first threaded hole and presses against the adjusting plug.

[0029] The positioning block is equipped with a limiting element, which is used to prevent the V-shaped positioning block from coming out of the guide hole.

[0030] Furthermore, the main body is provided with positioning keys that correspond one-to-one with the clamping modules, and the positioning keys extend along the length direction of the main body;

[0031] The bottom of the first support block, the second support block, and the positioning block are all provided with a first keyway, which cooperates with the positioning key;

[0032] A pair of second bolts are provided on the first support block, and the pair of second bolts are respectively connected to one of the first positioning holes in the two rows of first positioning holes;

[0033] The second support block is also provided with two first bolts, and each first groove is provided with two first bolts, L≥2×M+D;

[0034] The positioning block is provided with at least one pair of third bolts, and each pair of third bolts is connected to one of the first positioning holes in the two rows of first positioning holes;

[0035] All the first positioning holes in the same row are evenly spaced along the length of the body.

[0036] Furthermore, it also includes one or more spare first support blocks, one or more spare second support blocks, and one or more spare circumferential positioning mechanisms to meet the clamping requirements of different shafts to be processed.

[0037] Furthermore, it also includes a hydraulic station, connecting valve, pressure gauge, accumulator, supply line, return line and gasket; the connecting valve is installed on the main body, the supply line and return line are connected to the hydraulic station through the connecting valve, and the pressure gauge and accumulator are both connected to the supply line;

[0038] The clamping mechanism includes a clamping arm, a hydraulic rotary cylinder, and a base;

[0039] The main body is also provided with a second positioning structure that corresponds to and cooperates with the base. The second positioning structure includes two rows of second positioning holes spaced apart along the width direction of the main body. All the second positioning holes in the same row are evenly spaced along the length direction of the main body.

[0040] The base is provided with a pair of second sliding grooves extending along the length of the body. The two second sliding grooves correspond to two rows of second positioning holes respectively. Two fourth bolts are inserted in each second sliding groove. The position of the fourth bolts in the second sliding groove can be adjusted along the length of the body. The two fourth bolts passing through the same second sliding groove are connected to the two second positioning holes in the corresponding row of second positioning holes. Let the length of the second sliding groove be X, the distance between the central axes of two adjacent second positioning holes in the same row be Y, and the diameter of the second positioning hole be d. Then X≥2×Y+d;

[0041] The hydraulic rotary cylinder is mounted on the base, and one end of the clamping arm is connected to the output end of the hydraulic rotary cylinder. The movement of the hydraulic rotary cylinder drives the clamping arm to switch between the clamping and releasing positions. The hydraulic rotary cylinder is connected to the supply and return lines. A gasket is installed between the base and the main body to adjust the height of the base.

[0042] Furthermore, a pair of second threaded holes are provided on the top of the first support block for installing a manual clamping mechanism;

[0043] The top of the second support block is provided with a pair of third threaded holes, which are used to install a manual clamping mechanism.

[0044] Furthermore, it also includes two cylindrical protective blocks and three lifting lugs;

[0045] There are two sets of clamping modules, and the two sets of clamping modules are arranged sequentially along the length of the body.

[0046] Two cylindrical protective blocks are respectively placed in the empty first V-shaped groove and the second V-shaped groove; the cylindrical protective blocks are made of nylon;

[0047] All three lugs are installed on the main body, and the three lugs are distributed in a triangular pattern on the main body.

[0048] The advantages of this utility model compared to the prior art are:

[0049] 1. By cooperating with the first bolt, the first positioning structure, and the first slide, the position of the second support block on the body can be continuously adjusted, thereby enabling continuous adjustment of the distance between the first and second support blocks. This allows for the clamping requirements of a wider variety of shafts to be processed. Furthermore, by cooperating with the second bolt and the first positioning structure, the position of the first support block on the body can be adjusted. Simultaneously, the first support block, the second support block, and the circumferential positioning mechanism can be replaced according to the clamping requirements of the shafts to be processed, further satisfying the clamping requirements of a wider variety of shafts to be processed. This achieves product compatibility, solves the problem of numerous fixtures caused by a wide variety of products, and eliminates the need to hoist the entire fixture when switching products, thus solving the problem of laborious operation during product changeover. It also solves the problem of wasted time caused by a wide variety of shaft assembly parts and frequent product changeovers.

[0050] 2. Two clamping modules are set on the main body, with two workstations. Two shafts to be processed can be clamped at one time. Compared with single-station fixtures, two shafts to be processed can be processed at one time. The time for loading and unloading workpieces, blowing air to remove iron filings and hydraulic clamping pressurization can be combined, which can greatly improve processing efficiency.

[0051] 3. Use a hydraulic rotary cylinder to clamp the shaft to be processed. The clamping force of the hydraulic rotary cylinder is consistent each time it clamps. In addition, compared with manual clamping to tighten bolts, the hydraulic rotary cylinder only needs to be turned on and off the connecting valve each time it is used. It is simple to operate and saves effort. Furthermore, compared with two sets of hydraulic clamps, it can save the connecting valve, pressure gauge and accumulator. Attached Figure Description

[0052] Figure 1 This is a three-dimensional structural schematic diagram of an embodiment of an adjustable shaft clamp according to the present invention;

[0053] Figure 2 This is a top view of an embodiment of an adjustable shaft clamp according to the present invention.

[0054] Figure 3 for Figure 2 Sectional view at point AA;

[0055] Figure 4 for Figure 2 Enlarged view of point B in the middle;

[0056] Figure 5 This is a partial three-dimensional structural schematic diagram of an embodiment of an adjustable shaft clamp according to the present invention;

[0057] Figure 6 This is a three-dimensional structural diagram of the first support block, circumferential positioning mechanism and shim in an embodiment of an adjustable shaft clamp of the present invention;

[0058] Figure 7 This is a three-dimensional structural diagram of the quick-change block in an embodiment of an adjustable shaft clamp according to this utility model.

[0059] The annotations in the attached figures are explained as follows:

[0060] 1-Body, 2-First support block, 21-First V-groove, 22-First positioning surface, 23-Second threaded hole, 24-First through hole, 3-Second support block, 31-Second V-groove, 32-First sliding groove, 33-Third threaded hole, 4-Circumferential positioning mechanism, 41-Positioning block, 411-Guide hole, 412-First threaded hole, 413-Second through hole, 42-V-shaped positioning block, 421-Third V-groove, 422-Limiting groove, 43-Spring, 44-Limiting component, 45-Adjusting plug, 5-Clamping mechanism, 51-Clamping arm, 52-Hydraulic rotary knob Rotary cylinder, 53-base, 531-second slide groove, 54-shim, 541-third slide groove, 55-fourth bolt, 6-quick change block, 61-first pin hole, 62-second positioning surface, 63-countersunk hole, 7-positioning key, 81-connecting valve, 82-pressure gauge, 83-accumulator, 84-liquid supply line, 85-liquid return line, 9-cylindrical protective block, 10-first positioning hole, 11-first bolt, 12-second bolt, 13-third bolt, 14-fifth bolt, 15-first keyway, 16-lifting lug, 17-second positioning hole, 18-second keyway. Detailed Implementation

[0061] To make the objectives, advantages and features of this utility model clearer, the following describes in further detail an adjustable shaft clamp proposed by this utility model in conjunction with the accompanying drawings and specific embodiments.

[0062] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0063] In the description of this utility model, it should be noted that the terms "first", "second", "third", "fourth" and "fifth" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0064] like Figure 1 and Figure 2 As shown, this utility model discloses an adjustable shaft fixture, comprising a body 1 and two clamping modules, which are sequentially arranged on the body 1 along its length. The two clamping modules on the body 1 provide two workstations, allowing for the clamping of two shafts to be processed at a time. Compared to single-station fixtures, this design integrates the time spent on workpiece loading and unloading, air blowing to remove metal chips, and hydraulic clamping, significantly improving processing efficiency.

[0065] The main body 1 is provided with a first positioning structure that corresponds to and cooperates with the clamping module. Each first positioning structure includes two rows of first positioning holes 10 spaced apart along the width direction of the main body 1. All the first positioning holes 10 in the same row are evenly spaced along the length direction of the main body 1. Each first positioning hole 10 is provided with an internal thread.

[0066] like Figure 1 , Figure 2 As shown, each clamping module includes a first support block 2 and a second support block 3. The first support block 2 and the second support block 3 are detachably mounted on the body 1, and the first support block 2 and the second support block 3 are spaced apart along the length of the body 1.

[0067] like Figure 2 , Figure 3 and Figure 6 As shown, the top of the first support block 2 is provided with a first V-groove 21, and both ends of the first V-groove 21 penetrate through the first support block 2 along the length direction of the body 1. The first V-groove 21 is used to support the positioning part of one end of the shaft to be processed. The surface of the first support block 2 near the second support block 3 is a first positioning surface 22, which is used to axially position the shaft to be processed. The first positioning surface 22 is a precision-machined surface. The top of the second support block 3 is provided with a second V-groove 31, and both ends of the second V-groove 31 penetrate through the second support block 3 along the length direction of the body 1. The second V-groove 31 is used to support the shaft to be processed. The positioning part at the other end; the symmetrical planes of the two sides of the second V-groove 31 coincide with the symmetrical planes of the two sides of the first V-groove 21, and the symmetrical planes of the two sides of the second V-groove 31 are perpendicular to the upper surface of the body 1. After the positioning parts at both ends of the shaft to be processed are placed on the first V-groove 21 and the second V-groove 31 respectively, the central axis of the positioning parts at both ends of the shaft to be processed is parallel to the upper surface of the body 1, and the distance from the central axis of the positioning parts at both ends of the shaft to be processed to the upper surface of the body 1 is equal. By fitting the positioning surface on the shaft to be processed with the first positioning surface 22, the axial positioning of the shaft to be processed can be achieved.

[0068] like Figure 1 , Figure 6 As shown, the first support block 2 is detachably mounted on the body 1 by a pair of second bolts 12. Each of the protrusions on both sides of the lower part of the first support block 2 is provided with a first through hole 24. The pair of second bolts 12 pass through the pair of first through holes 24 and are threadedly connected to one of the first positioning holes 10 in the two rows of first positioning holes 10, thereby detachably mounting the first support block 2 on the body 1. By connecting the second bolts 12 to different first positioning holes 10, the position of the first support block 2 on the body 1 can be adjusted.

[0069] like Figure 1 , Figure 2As shown, the second support block 3 is detachably mounted on the body 1 by four first bolts 11. A pair of first sliding grooves 32 are provided on the lower boss of the second support block 3. Both first sliding grooves 32 extend along the length of the body 1. The length of the first sliding groove 32 is defined as L, the distance between the central axes of two adjacent first positioning holes 10 in the same row is defined as M, and the diameter of the first positioning hole 10 is defined as D. Then L = 3 × M + D. Of the four first bolts 11, two first bolts 11 pass through one first sliding groove 32 and two first positioning holes 10 in the same row. The second support block 3 is detachably mounted on the body 1 by threading the first bolt 11 through another first groove 32 and threading it into two of the first positioning holes 10 in another row of first positioning holes 10. By connecting the first bolt 11 to different first positioning holes 10 and adjusting the position of the first bolt 11 within the corresponding first groove 32, the position of the second support block 3 on the body 1 can be continuously adjusted, thereby enabling continuous adjustment of the distance between the first support block 2 and the second support block 3, thus meeting the clamping requirements of more different shafts to be processed. In other embodiments, L ≥ 2 × M + D can also be set, for example, L = 2 × M + D, L = 2.5 × M + D, or L = 4 × M + D, etc.

[0070] When it is necessary to adjust the distance between the first support block 2 and the second support block 3, if the distance to be adjusted is small, the position of the second support block 3 can be adjusted by adjusting the position of the first bolt 11 in the corresponding first groove 32, thereby adjusting the distance between the first support block 2 and the second support block 3. If the distance to be adjusted is large, a suitable first positioning hole 10 can be selected first, and the first support block 2 and / or the second support block 3 can be fixed using the suitable first positioning hole 10. Then, it is determined whether the distance between the first support block 2 and the second support block 3 is equal to the target spacing value. If yes, the adjustment of the distance between the first support block 2 and the second support block 3 is completed. If not, the position of the second support block 3 can be adjusted by adjusting the position of the first bolt 11 in the corresponding first groove 32, so that the distance between the first support block 2 and the second support block 3 meets the target spacing value.

[0071] Gear shaft parts are generally quite heavy. During hoisting, the shaft to be processed often collides with the surfaces of the first V-groove 21 and the second V-groove 31. Prolonged use can easily lead to damage to the first support block 2 and the second support block 3. Therefore, such as... Figure 1 , Figure 3 , Figure 6As shown, quick-change blocks 6 are installed on both sides of the first V-groove 21 and both sides of the second V-groove 31. The material of the quick-change blocks 6 is softer than that of the first support block 2 and the second support block 3. In the design, the part that contacts the workpiece uses a softer material to protect the workpiece. When the surface of the quick-change blocks 6 is severely worn due to long-term use, only the quick-change blocks 6 need to be replaced, and there is no need to replace the first support block 2 or the second support block 3 as a whole.

[0072] like Figure 1 , Figure 6 and Figure 7 As shown, the quick-change block 6 is provided with a pair of countersunk holes 63 penetrating its upper and lower surfaces. The pair of countersunk holes 63 are used to install the quick-change block 6 onto the first support block 2 or the second support block 3 by a pair of screws. The upper and lower surfaces of the quick-change block 6 are parallel, and the lower surface of the quick-change block 6 is in contact with the side of the first V-groove 21 or the side of the second V-groove 31. The quick-change block 6 is provided with a second positioning surface 62, which is a precision-machined surface. Through a grinding process, the second positioning surface 62 and the first positioning surface 22 on the quick-change block 6 mounted on the first support block 2 are located in the same plane. This second positioning surface 62 is used for the axial positioning of the shaft to be processed, because when different shafts to be processed are axially positioned, some shafts to be processed will have different axial positioning requirements. The machining axis is positioned using the first positioning surface 22 on the first support block 2, and some machining axes are positioned using the second positioning surface 62 on the quick-change block 6. The quick-change block 6 is provided with a pair of first pin holes 61. After passing through the pair of first pin holes 61, a pair of pins extend into a pair of second pin holes on the first support block 2 or into a pair of third pin holes on the second support block 3 to achieve precise positioning of the quick-change block 6. In order to ensure that the quick-change block 6 is in the correct direction when changing the quick-change block 6, the pair of first pin holes 61 are asymmetrically arranged on the quick-change block 6. The distance from the pair of first pin holes 61 to the first positioning surface 22 is less than the distance from the pair of first pin holes 61 to the end face of the quick-change block 6 opposite to the first positioning surface 22.

[0073] like Figure 1 and Figure 2 As shown, each clamping module also includes a pair of clamping mechanisms 5. The pair of clamping mechanisms 5 cooperate with the first support block 2 and the second support block 3 respectively, and are used to clamp the positioning parts at both ends of the shaft to be processed onto the first support block 2 and the second support block 3 respectively. The pair of clamping mechanisms 5 are both set on the body 1, and the positions of the pair of clamping mechanisms 5 on the body 1 can be adjusted along the length direction of the body 1.

[0074] like Figure 1 and Figure 2As shown, each clamping mechanism 5 includes a clamping arm 51, a hydraulic rotary cylinder 52, a base 53, and four fourth bolts 55. The body 1 also has a second positioning structure that corresponds to and cooperates with the base 53. The second positioning structure includes two rows of second positioning holes 17 spaced apart along the width direction of the body 1. All second positioning holes 17 in the same row are evenly spaced along the length direction of the body 1. Each second positioning hole 17 has an internal thread. The base 53 has a pair of second sliding grooves 531 extending along the length direction of the body 1. The length of the second sliding groove 531 is defined as X, and the distance between the central axes of two adjacent second positioning holes 17 in the same row is defined as X. Let the distance be Y, and the diameter of the second positioning hole 17 be defined as d, then X = 4 × Y + d. Of the four fourth bolts 55, two fourth bolts 55 pass through a second slide groove 531 and connect to two of the second positioning holes 17 in one row, while the other two fourth bolts 55 pass through another second slide groove 531 and connect to two of the second positioning holes 17 in another row. This allows the base 53 to be detachably mounted on the body 1. By connecting the fourth bolts 55 to different second positioning holes 17 and adjusting the position of the fourth bolts 55 within the corresponding second slide groove 531, the position of the base 53 can be continuously adjusted, thereby achieving continuous adjustment of the position of the clamping arm 51. In other embodiments, X ≥ 2 × Y + d can also be set, for example, X = 2 × Y + d, X = 3 × Y + d, or X = 5 × Y + d, etc.

[0075] The hydraulic rotary cylinder 52 is fixedly mounted on the base 53 by bolts. One end of the clamping arm 51 is connected to the output end of the hydraulic rotary cylinder 52. The hydraulic rotary cylinder 52 drives the clamping arm 51 to switch between the clamping position and the loosening position. When the clamping arm 51 is in the clamping position, the clamping arm 51 is parallel to the upper surface of the body 1. When the clamping arm 51 is in the loosening position, the clamping arm 51 is perpendicular to the upper surface of the body 1.

[0076] When switching products, the diameter of the positioning parts at both ends of the shaft to be processed may change. If the diameter of the positioning parts changes, under pressure, the clamping arm 51 will form a certain angle with the upper surface of the body 1. If the angle between the clamping arm 51 and the upper surface of the body 1 is negative, and the clamping arm 51 cannot contact the positioning part of the shaft to be processed even when it rotates to be parallel with the upper surface of the body 1, it may cause overtravel. When overtravel occurs, the clamping force cannot be applied to the shaft to be processed. If the angle between the clamping arm 51 and the upper surface of the body 1 is positive, and the clamping arm 51 contacts the positioning part of the shaft to be processed before rotating to be parallel with the upper surface of the body 1, it will give the shaft to be processed a component force that moves along the upper surface of the quick-change block 6. This component force may cause clamping failure. Therefore, if Figure 1 , Figure 2 , Figure 6As shown, the adjustable shaft clamp of this utility model also includes a shim 54. The shim 54 is used to install between the base 53 and the body 1 to adjust the height of the base 53. The shim 54 is provided with a pair of third sliding grooves 541, which correspond one-to-one with a pair of second sliding grooves 531 on the base 53. The third sliding grooves 541 are used for the fourth bolt 55 to pass through, and the length of the third sliding groove 541 is greater than or equal to the length of the second sliding groove 531. When switching products, the height of the base 53 can be adjusted by installing the shim 54 under the base 53, or by reducing the number of shims 54 installed under the base 53, or by replacing the shims 54 with shims of different thicknesses. This allows for the adjustment of the height of the clamping arm 51, ensuring that the clamping arm 51 is parallel to the upper surface of the body 1 under pressure. When the shim 54 is not in use, it can be temporarily stored by fixing it to the top of the positioning block 41 with screws. Alternatively, the shim 54 can be stored elsewhere.

[0077] like Figure 1 , Figure 2 As shown, the adjustable shaft fixture of this utility model also includes a hydraulic station, a connecting valve 81, a pressure gauge 82, an accumulator 83, a supply line 84, and a return line 85. The connecting valve 81, pressure gauge 82, and accumulator 83 are all mounted on the main body 1. The supply line 84 and return line 85 are connected to the hydraulic station through the connecting valve 81. The pressure gauge 82 and accumulator 83 are both connected to the supply line 84. Four hydraulic rotary cylinders 52 are all connected to the supply line 84 and the return line 85. The hydraulic rotary cylinders 52 are used to clamp the workpiece. The clamping force of the hydraulic rotary cylinders 52 is consistent each time. Compared with tightening bolts with a manual fixture, each time the hydraulic rotary cylinders 52 are used, only the switch of the connecting valve 81 needs to be turned on, which is simple and labor-saving, and solves the problem of frequent manual operation during processing. The dual-station fixture saves the connecting valve 81, pressure gauge 82, and accumulator 83 compared with two sets of hydraulic fixtures.

[0078] like Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6As shown, each clamping module also includes a circumferential positioning mechanism 4, which is used for circumferential positioning of the shaft to be processed. Each circumferential positioning mechanism 4 includes a positioning block 41 and a V-shaped positioning block 42. The positioning block 41 is located between the first support block 2 and the second support block 3. The bottom of the positioning block 41 is provided with four second through holes 413 for detachably fixing the positioning block 41 to the body 1 by four third bolts 13. Of the four third bolts 13, two third bolts 13 pass through the corresponding second through holes 413 and are connected to two first positioning holes 10 in one row of first positioning holes 10, respectively. The other two third bolts 13 pass through the corresponding second through holes 413 and are connected to two first positioning holes 10 in another row of first positioning holes 10, respectively. The first support block 2 has four third bolts 413. A fourth pin hole extending along the length of the body 1 is provided, and a fifth pin hole that mates with the fourth pin hole is provided on the positioning block 41. Thus, the positioning of the first support block 2 and the positioning block 41 can be achieved by using pins. The end face of the positioning block 41 near the first support block 2 is the third positioning surface, which is a precision-machined surface. The first support block 2 is also provided with a pair of third through holes. A pair of fifth bolts 14 pass through the pair of third through holes and are connected to a pair of fourth threaded holes on the positioning block 41, so that the third positioning surface and the first positioning surface 22 fit tightly together, so as to ensure that the distance from the central axis of the guide hole 411 to the first positioning surface 22 meets the positioning requirements of the shaft to be processed.

[0079] The top of the positioning block 41 is provided with a guide hole 411. The central axis of the guide hole 411 is perpendicular to the upper surface of the body 1 and is located in the symmetrical plane of the two sides of the second V-groove 31. The V-shaped positioning block 42 is rotatably disposed in the guide hole 411 and can move up and down in the guide hole 411. The upper end of the V-shaped positioning block 42 extends upward out of the guide hole 411. The top of the V-shaped positioning block 42 is provided with a third V-groove 421. The third V-groove 421 can adapt to different types of teeth. During processing, the third V-groove 421 is engaged on the teeth of the shaft to be processed, which can restrict the degree of freedom of the shaft to be processed to rotate around the central axis of the shaft to be processed, thereby realizing the circumferential positioning of the shaft to be processed. When positioning the helical teeth, the V-shaped positioning block 42 can rotate to ensure that the helical teeth can be engaged in the third V-groove 421. Thus, when switching between different types of products, the V-shaped positioning block 42 can match different products.

[0080] Each circumferential positioning mechanism 4 also includes a spring 43, a limiting member 44, and an adjusting plug 45. The spring 43 is located inside the guide hole 411 and below the V-shaped positioning block 42. The spring 43 exerts a large upward force on the V-shaped positioning block 42. By selecting an appropriate spring hardness, it can be ensured that the upward force of the spring 43 is large enough, but not so large that the shaft to be processed leaves the upper surface of the quick-change block 6. The bottom surface of the positioning block 41 is provided with a first threaded hole 412. The upper end of the first threaded hole 412 is connected to the lower end of the guide hole 411. The adjusting plug 45 is threaded into the first threaded hole 412. The spring 43... The lower end of the spring 43 extends into the first threaded hole 412 and presses against the adjusting screw plug 45. By turning the adjusting screw plug 45, the position of the adjusting screw plug 45 in the first threaded hole 412 can be adjusted, thereby adjusting the elastic force of the spring 43. The middle part of the V-shaped positioning block 42 is provided with an annular limiting groove 422. The limiting member 44 is a screw. The limiting member 44 is threaded into the fifth threaded hole on the V-shaped positioning block 42. The inner end of the limiting member 44 extends into the limiting groove 422. The inner end of the limiting member 44 blocks the upper part of the lower end face of the limiting groove 422, which can prevent the V-shaped positioning block 42 from coming out of the guide hole 411.

[0081] like Figure 1 , Figure 2 and Figure 3 As shown, the main body 1 is also provided with two second keyways 18 extending along the length direction of the main body 1. Each second keyway 18 is equipped with a positioning key 7, which is composed of three flat key standard parts. The bottom of the first support block 2, the second support block 3 and the positioning block 41 are all provided with first keyways 15, which cooperate with the positioning key 7. Through the cooperation of the positioning key 7, the quick replacement of the first support block 2 and the second support block 3 can be guaranteed.

[0082] like Figure 1 and Figure 4As shown, the top of the first support block 2 is provided with a pair of second threaded holes 23 for installing a manual clamping mechanism. The top of the second support block 3 is provided with a pair of third threaded holes 33 for installing a manual clamping mechanism. By reserving the second threaded holes 23 and the third threaded holes 33, it is convenient to switch to the manual clamping mechanism when the clamping mechanism 5 fails, so as to ensure the continuation of production and processing; it is also convenient to switch to the manual clamping mechanism to achieve manual clamping in certain working conditions where manual clamping is required. A manual clamping mechanism can be configured including a clamping element, two screws, and two nuts. The two screws are threaded into a pair of second threaded holes 23 or a pair of third threaded holes 33, respectively. One end of the clamping element is rotatably fitted onto one screw, and the other end of the clamping element has a U-shaped notch. The two nuts are threaded onto the two screws, respectively, and are both located above the clamping element. When clamping the workpiece, the clamping element is rotated so that the U-shaped notch on the clamping element engages with the other screw. Then, the two nuts are tightened so that both nuts are tightly pressed against the upper surface of the clamping element, thereby pressing the shaft to be processed onto the first support block 2 or the second support block 3. It should be noted that the above manual clamping mechanism is only an example.

[0083] like Figure 1 As shown, during the production process, when only single-station processing is required, all hydraulic rotary cylinders 52 will actuate when the connecting valve 81 is activated. If there are no workpieces in the idle station for a long time, the hydraulic rotary cylinders 52 will be damaged. Therefore, the adjustable shaft fixture of this utility model also includes two cylindrical protective blocks 9. The cylindrical protective blocks 9 are made of nylon. When the cylindrical protective blocks 9 are not needed, they are fixed to the body 1 with bolts. When only single-station processing is used, the two cylindrical protective blocks 9 can be placed in the first V-groove 21 and the second V-groove 31 of the idle station, respectively, which can protect the hydraulic rotary cylinders 52.

[0084] The adjustable shaft clamp of this utility model also includes three lifting lugs 16. All three lifting lugs 16 are installed on the body 1 and are arranged in a triangular pattern on the body 1. The clamp as a whole can be lifted by means of the lifting lugs 16.

[0085] The adjustable shaft fixture of this utility model also includes one or more spare first support blocks 2, one or more spare second support blocks 3, and one or more spare circumferential positioning mechanisms 4, which can meet the processing needs of more different shafts to be processed.

[0086] When switching between different types of processing shafts, if the diameters of the positioning parts of the two processing shafts are the same but the shaft lengths are different, the distance between the first support block 2 and the second support block 3 can be adjusted. At this time, depending on the actual needs, only the position of the second support block 3 can be adjusted, or only the positions of the first support block 2 and the positioning block 41 can be adjusted, or the positions of the second support block 3, the first support block 2, and the positioning block 41 can be adjusted simultaneously. Of course, when adjusting the positions of the first support block 2 and the second support block 3, the position of the clamping mechanism 5 that cooperates with the first support block 2 and the second support block 3 also needs to be adjusted accordingly.

[0087] When switching between different types of processing shafts, if the diameters of the positioning parts of the two processing shafts are different, depending on the actual needs, the first support block 2 can be kept unchanged, and the second support block 3 can be remade or a suitable second support block 3 can be selected. Then, the second support block 3 can be replaced and adjusted to a suitable position. Alternatively, the second support block 3 can be kept unchanged, and the first support block 2 can be remade or a suitable first support block 2 can be selected. Then, the first support block 2 can be replaced and adjusted to a suitable position. This ensures that after the positioning parts at both ends of the new processing shaft are placed on the first support block 2 and the second support block 3, the distance between the central axis of the positioning parts at both ends of the processing shaft and the upper surface of the body 1 is equal. Of course, it is also necessary to adjust the height of the base 53 of the corresponding clamping mechanism 5 according to the diameter of the positioning parts at both ends of the new processing shaft to ensure that the clamping arm 51 is parallel to the upper surface of the body 1 when it is in the clamping position.

[0088] When switching between different types of processing shafts, if the axial positioning dimensions of the two processing shafts are different, the positioning block 41 can be remade or a suitable positioning block 41 can be selected and then the positioning block 41 can be replaced. It should be noted that the axial positioning dimension is the distance from the central axis of the guide hole 411 to the first positioning surface 22.

[0089] When switching between different types of processing shafts, if the diameters of the positioning parts placed on the first support block 2 of the two processing shafts are different and the axial positioning dimensions are different, replace the first support block 2 and the positioning block 41 and adjust the first support block 2 and the positioning block 41 to the appropriate position, and then adjust the height of the corresponding clamping arm 51 accordingly.

[0090] The distance between the first support block 2 and the second support block 3 can be continuously adjusted, and the first support block 2, the second support block 3, and the positioning block 41 can be replaced according to the clamping requirements of the shaft to be processed. This can meet the clamping requirements of more different shafts to be processed, achieve product compatibility, solve the problem of numerous fixtures caused by a variety of products, and eliminate the need to hoist the entire fixture when switching products. This solves the problem of laborious operation during product changeover, and also solves the problem of time waste caused by the large variety of shaft assembly parts and frequent product changeovers.

[0091] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the specific technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of this utility model.

Claims

1. An adjustable shaft clamp, characterized in that: It includes a body (1) and at least one assembly clip module disposed on the body (1); The clamping module includes a first support block (2), a second support block (3), a circumferential positioning mechanism (4), and a pair of clamping mechanisms (5); the first support block (2) and the second support block (3) are detachable and spaced apart along the length of the body (1); The main body (1) is provided with a first positioning structure that corresponds to and cooperates with the clamping module. The first positioning structure includes two rows of first positioning holes (10) spaced apart along the width direction of the main body (1). All the first positioning holes (10) in the same row are spaced apart along the length direction of the main body (1). The second support block (3) is provided with two first bolts (11), which are respectively connected to one of the first positioning holes (10) in the two rows of first positioning holes (10); the second support block (3) is provided with two first sliding grooves (32) extending along the length of the body (1), and the screws of the two first bolts (11) are respectively inserted into the two first sliding grooves (32); Let L be the length of the first groove (32), M be the distance between the central axes of two adjacent first positioning holes (10) in the same row, and D be the diameter of the first positioning hole (10). Then L ≥ M + D. The circumferential positioning mechanism (4) and a pair of clamping mechanisms (5) are both mounted on the body (1); the circumferential positioning mechanism (4) is used to circumferentially position the shaft to be processed; the pair of clamping mechanisms (5) cooperate with the first support block (2) and the second support block (3) respectively, and are used to clamp the positioning parts at both ends of the shaft to be processed onto the first support block (2) and the second support block (3) respectively.

2. The adjustable shaft clamp according to claim 1, characterized in that: The top of the first support block (2) is provided with a first V-groove (21), and the two ends of the first V-groove (21) penetrate the first support block (2) along the length direction of the body (1). The first V-groove (21) is used to support the positioning part of one end of the shaft to be processed. The surface of the first support block (2) near the second support block (3) is the first positioning surface (22), which is used to axially position the shaft to be processed. The first positioning surface (22) is a finishing surface. The top of the second support block (3) is provided with a second V-groove (31). The two ends of the second V-groove (31) penetrate the second support block (3) along the length direction of the body (1). The symmetrical planes of the two sides of the second V-groove (31) coincide with the symmetrical planes of the two sides of the first V-groove (21). The second V-groove (31) is used to support the positioning part of the other end of the shaft to be processed. After the positioning parts at both ends of the shaft to be processed are placed on the first V-groove (21) and the second V-groove (31) respectively, the central axis of the positioning parts at both ends of the shaft to be processed is parallel to the upper surface of the body (1).

3. The adjustable shaft clamp according to claim 2, characterized in that: Quick-change blocks (6) are installed on both sides of the first V-groove (21) and both sides of the second V-groove (31); The upper and lower surfaces of the quick-change block (6) are parallel, and the lower surface of the quick-change block (6) is in contact with the side of the first V-groove (21) or the side of the second V-groove (31). The quick-change block (6) is provided with a second positioning surface (62), wherein the second positioning surface (62) on the quick-change block (6) installed on the first support block (2) and the first positioning surface (22) are located in the same plane; the second positioning surface (62) is a precision-machined surface; The quick-change block (6) is provided with a pair of first pin holes (61). After passing through the pair of first pin holes (61) respectively, the pair of pins extend into a pair of second pin holes on the first support block (2) or into a pair of third pin holes on the second support block (3). A pair of first pin holes (61) are asymmetrically arranged on the quick-change block (6).

4. The adjustable shaft clamp according to claim 2, characterized in that: The circumferential positioning mechanism (4) includes a positioning block (41) and a V-shaped positioning block (42); The positioning block (41) is detachably mounted on the body (1) and located between the first support block (2) and the second support block (3). The end face of the positioning block (41) near the first support block (2) is the third positioning surface. The third positioning surface is a precision-machined surface and is in contact with the first positioning surface (22). The V-shaped positioning block (42) is rotatably mounted on the positioning block (41) and can be adjusted up and down. The top of the V-shaped positioning block (42) is provided with a third V-shaped groove (421), which is used to lock onto the teeth of the shaft to be processed.

5. The adjustable shaft clamp according to claim 4, characterized in that: The top of the positioning block (41) is provided with a guide hole (411), and the central axis of the guide hole (411) is located in the symmetrical plane of the two sides of the second V-shaped groove (31). The V-shaped positioning block (42) is rotatably and can be moved up and down in the guide hole (411), and the upper end of the V-shaped positioning block (42) extends upward out of the guide hole (411). The circumferential positioning mechanism (4) also includes a spring (43) and an adjusting screw (45). The spring (43) is disposed in the guide hole (411) and located below the V-shaped positioning block (42). The bottom surface of the positioning block (41) is provided with a first threaded hole (412). The upper end of the first threaded hole (412) is connected to the lower end of the guide hole (411). The adjusting plug (45) is threaded in the first threaded hole (412). The lower end of the spring (43) extends into the first threaded hole (412) and presses against the adjusting plug (45). The positioning block (41) is provided with a limiting member (44), which is used to prevent the V-shaped positioning block (42) from coming out of the guide hole (411).

6. The adjustable shaft clamp according to claim 4, characterized in that: The main body (1) is provided with positioning keys (7) that correspond one-to-one with the clamping modules, and the positioning keys (7) extend along the length direction of the main body (1); The bottom of the first support block (2), the second support block (3) and the positioning block (41) are all provided with a first keyway (15), which cooperates with the positioning key (7); The first support block (2) is provided with a pair of second bolts (12), and the pair of second bolts (12) are respectively connected to one of the first positioning holes (10) in the two rows of first positioning holes (10); The second support block (3) is also provided with two first bolts (11), and each first groove (32) is provided with two first bolts (11), L≥2×M+D; The positioning block (41) is provided with at least one pair of third bolts (13), and each pair of third bolts (13) is connected to one of the first positioning holes (10) in the two rows of first positioning holes (10); All the first positioning holes (10) in the same row are evenly spaced along the length of the body (1).

7. The adjustable shaft clamp according to claim 4, characterized in that: It also includes one or more spare first support blocks (2), one or more spare second support blocks (3), and one or more spare circumferential positioning mechanisms (4) to meet the clamping requirements of different shafts to be processed.

8. The adjustable shaft clamp according to claim 1, characterized in that: It also includes a hydraulic station, a connecting valve (81), a pressure gauge (82), an accumulator (83), a supply line (84), a return line (85), and a gasket (54); the connecting valve (81) is installed on the main body (1), the supply line (84) and the return line (85) are connected to the hydraulic station through the connecting valve (81), and the pressure gauge (82) and the accumulator (83) are both connected to the supply line (84); The clamping mechanism (5) includes a clamping arm (51), a hydraulic rotary cylinder (52), and a base (53); The main body (1) is also provided with a second positioning structure that corresponds to and cooperates with the base (53). The second positioning structure includes two rows of second positioning holes (17) spaced apart along the width direction of the main body (1). All the second positioning holes (17) in the same row are evenly spaced along the length direction of the main body (1). The base (53) is provided with a pair of second slide grooves (531) extending along the length of the body (1). The two second slide grooves (531) correspond to two rows of second positioning holes (17) respectively. Two fourth bolts (55) are inserted in each second slide groove (531). The position of the fourth bolts (55) in the second slide groove (531) can be adjusted along the length of the body (1). The two fourth bolts (55) passing through the same second slide groove (531) are connected to the two second positioning holes (17) in the corresponding row of second positioning holes (17). The length of the second slide groove (531) is defined as X, the distance between the central axes of two adjacent second positioning holes (17) in the same row is defined as Y, and the diameter of the second positioning hole (17) is defined as d. Then X≥2×Y+d. The hydraulic rotary cylinder (52) is mounted on the base (53). One end of the clamping arm (51) is connected to the output end of the hydraulic rotary cylinder (52). The hydraulic rotary cylinder (52) moves to switch the clamping arm (51) between the clamping position and the loosening position. The hydraulic rotary cylinder (52) is connected to the liquid supply line (84) and the liquid return line (85). The gasket (54) is used to be installed between the base (53) and the body (1) to adjust the height of the base (53).

9. The adjustable shaft clamp according to claim 8, characterized in that: The top of the first support block (2) is provided with a pair of second threaded holes (23), which are used to install a manual clamping mechanism; The top of the second support block (3) is provided with a pair of third threaded holes (33), which are used to install a manual clamping mechanism.

10. The adjustable shaft clamp according to claim 1, characterized in that: It also includes two cylindrical protective blocks (9) and three lifting lugs (16); The clamping module is provided in two sets, and the two clamping modules are arranged sequentially along the length direction of the body (1); The two cylindrical protective blocks (9) are respectively placed in the empty first V-groove (21) and second V-groove (31); the cylindrical protective blocks (9) are made of nylon; All three lifting lugs (16) are mounted on the body (1), and the three lifting lugs (16) are arranged in a triangular pattern on the body (1).

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