Clamp special for casting part

Abstract

The invention relates to the technical field of casting clamps, and discloses a special clamp for casting parts, which comprises a machine table, an adjusting mechanism is fixedly connected to the top of the machine table, a clamping mechanism is fixedly connected to the top of the adjusting mechanism, and a rotating mechanism is fixedly connected to the bottom end of the machine table; the adjusting mechanism comprises an operation assembly and a supporting assembly, and the supporting assembly is arranged on one side of the operation assembly. The operation assembly comprises a sliding seat, the sliding seat is fixedly connected to the top end of the inner side of the machine table, an I-shaped plate is rotatably connected to the interior of the sliding seat, a supporting strip is slidably connected to the interior of the I-shaped plate, a cylinder is fixedly connected to the surface of the supporting strip, and a door-shaped cylinder is movably connected to the surface of the I-shaped plate. According to the special clamp for the casting part, the four cross blocks can be driven to move equidistantly under the action of the circular plate, a workpiece can be rapidly clamped, the clamping and fixing effects can be automatically achieved after clamping, and the special clamp is convenient and rapid to operate and easy to master.

Description

Technical Field

[0001] The present invention relates to the technical field of casting jigs, and particularly to a special jig for casting parts. Background Art

[0002] A casting part jig is a device used to fix and position casting parts, and it plays a crucial role in the mechanical manufacturing process. The design and use of this jig are aimed at ensuring that the casting parts maintain the correct position during the processing, thereby guaranteeing the accuracy and quality of the products.

[0003] According to a special jig for drilling circular parts disclosed in the patent No. CN203592324U, it includes a base, on which a guiding groove is provided. Two relatively arranged V-shaped blocks are slidably arranged in the guiding groove. The working surfaces of the V-shaped blocks are perpendicular to the horizontal plane. T-shaped grooves are respectively vertically arranged on the outer sides of the two V-shaped blocks. One screw rod is horizontally arranged at each end of the base, and the inner ends of the screw rods form T-shaped heads.

[0004] For this special jig for drilling circular parts, although its structure is simple and it can be specifically used for processing circular parts, on the one hand, its clamping operation is not convenient, and it cannot stably clamp the workpiece. In addition, it cannot replace different clamping blocks for workpieces of different shapes. Therefore, corresponding improvement operations are required for this device. Summary of the Invention

[0005] The purpose of the present invention is to provide a special jig for casting parts to solve the problems raised in the above background art.

[0006] To solve the above technical problems, the present invention provides the following technical solution: A special jig for casting parts, including a machine table, an adjusting mechanism is fixedly connected to the top of the machine table, a clamping mechanism is fixedly connected to the top of the adjusting mechanism, and a rotating mechanism is fixedly connected to the bottom end of the machine table;

[0007] The adjusting mechanism includes an operating component and a supporting component, and the supporting component is arranged on one side of the operating component;

[0008] The operating component includes a sliding seat, the sliding seat is fixedly connected to the inner top end of the machine table, an I-shaped plate is rotatably connected inside the sliding seat, a supporting bar is slidably connected inside the I-shaped plate, a cylinder is fixedly connected to the surface of the supporting bar, a portal cylinder is movably connected to the surface of the I-shaped plate, a clamping bar is fixedly connected to the right side of the surface of the cylinder, a handle is fixedly connected to the left end of the surface of the cylinder, first springs are respectively fixedly connected to the inner sides of the front and rear ends of the I-shaped plate, a positioning bar is fixedly connected to the right side of the top of the sliding seat, a rack is fixedly connected to the right side of the portal cylinder, and a gear ring is meshed with the surface of the rack.

[0009] According to the above technical solution, a straight groove is opened inside the sliding seat, the surface of the support bar is slidably connected to the inside of the straight groove, through holes are respectively opened at the front and rear ends inside the sliding seat, and the surface of the I-shaped plate penetrates through the through holes respectively opened at the front and rear ends inside the sliding seat.

[0010] According to the above technical solution, a positioning hole is opened inside the positioning bar, one end of the surface of the clamping bar is matched with the inside of the positioning hole, a slot is opened on the right side inside the sliding seat, and the surface of the rack is slidably connected to the inside of the slot.

[0011] According to the above technical solution, the support assembly includes a round block, the round block is fixedly connected to the inside of the toothed ring, a short column is fixedly connected to the inside of the round block, a round plate is fixedly connected to the top end of the short column, second T-shaped short rods are respectively fixedly connected to the bottom end of the round plate, a hollow bar is rotatably connected to the surface of the second T-shaped short rod, a first T-shaped short rod is rotatably connected to the inside of one end of the hollow bar, a cross block is rotatably connected to the top of the first T-shaped short rod, and a second spring is fixedly connected to one end of the cross block.

[0012] According to the above technical solution, there are four cross blocks, and the four cross blocks are symmetrically distributed around the surface of the short column. When the hollow bar moves, it drives the cross blocks to move inside the support plate, making the clamping smooth, drives the hollow guide bar to move, and correspondingly drives the T-shaped seat and the clamping block to move and perform the clamping operation.

[0013] According to the above technical solution, the clamping mechanism includes a support plate, the support plate is fixedly connected to the top of the machine table, one end of the second spring is fixedly connected to the inside of the machine table, the top of the round plate is rotatably connected to the bottom end of the machine table, a support block is fixedly connected to the top of the support plate, there are four groups of support blocks, a support rod is fixedly connected between adjacent two support blocks, a hollow guide bar is slidably connected to the surface of the support rod, a T-shaped seat is arranged on the top of the hollow guide bar, an L-shaped plate is arranged on the side of the T-shaped seat, a third spring is fixedly connected to one end of the L-shaped plate, a T-shaped rod is fixedly connected to one end of the third spring, there are four groups of L-shaped plates, a cross bar is fixedly connected between adjacent two L-shaped plates, a U-shaped handle is fixedly connected to the middle of one side of the cross bar, inserting bars are respectively fixedly connected to both ends of the other side of the cross bar, a clamping block is arranged inside the T-shaped seat, a clamping block is fixedly connected to the top of the clamping block, a limiting rod is slidably connected to the inside of the hollow guide bar, gantry frames are respectively fixedly connected to both ends of the limiting rod, and an adjusting bolt is rotatably connected to the inside of the gantry frame.

[0014] According to the above technical solution, cross grooves are respectively opened at the four ends inside the machine table, and the surface of the cross block is slidably connected to the inside of the cross grooves.

[0015] According to the above technical solution, there are four hollow guide bars. Threaded holes are respectively opened in the middle of the left and right hollow guide bars. There are two adjusting bolts, and the two adjusting bolts are respectively threadedly connected to the interiors of the left and right hollow guide bars. Loosen the U-shaped handle and drive the cross bar to move automatically under the elastic supporting force of the third spring, so that the insertion bar can be inserted into the inside of the clamping block for the clamping function after replacing the clamping block, so that different clamping blocks can be replaced for workpieces of different shapes, and clamping operations for different types of workpieces can be carried out.

[0016] According to the above technical solution, the rotating mechanism includes an electric disc, the electric disc is fixedly connected to the bottom end of the machine table, a bottom plate is fixedly connected to the bottom end of the electric disc, a circular ring bar is fixedly connected to the top of the bottom plate, and a guide circular table is fixedly connected to the bottom of the machine table.

[0017] According to the above technical solution, a ring groove is opened at the top end inside the guide circular table, and the upper surface of the circular ring bar is slidably connected to the inside of the ring groove, so that the angle rotation adjustment of the workpiece during clamping and processing can be carried out, making the processing operation more convenient, and when rotating, the circular ring bar and the guide circular table can be used to support the stability performance during workpiece processing.

[0018] Compared with the prior art, the beneficial effects achieved by the present invention are as follows:

[0019] 1. For this special fixture for casting parts, through the provided adjusting mechanism, the fixing and releasing of the workpiece during clamping can be carried out. After the clamping operation is completed, loosen the handle and under the elastic supporting action of the first spring, carry out the clamping operation of the clamping bar being inserted into the positioning bar, so that the four cross blocks can be driven to move equidistantly by the action of the circular plate at the same time and quickly clamp the workpiece, and the clamping can be automatically fixed after clamping, and the operation is convenient, fast and easy to master.

[0020] 2. For this special fixture for casting parts, through the provided adjusting mechanism, when the gear ring drives the circular block to rotate, it drives the first T-shaped short rod to move, and then drives the hollow bar during movement, drives the cross block to move inside the support plate, makes the clamping smooth, drives the hollow guide bar to move, and correspondingly drives the T-shaped seat and the clamping block to move and carry out the clamping operation.

[0021] 3. For this special fixture for casting parts, through the provided clamping mechanism, the clamping block is inserted into the top end inside the T-shaped seat, and then loosen the U-shaped handle and drive the cross bar to move automatically under the elastic supporting force of the third spring, so that the insertion bar can be inserted into the inside of the clamping block for the clamping function after replacing the clamping block, so that different clamping blocks can be replaced for workpieces of different shapes, and clamping operations for different types of workpieces can be carried out.

[0022] 4. The special fixture for the casting part, through the set rotation mechanism, starts the electric disc and can drive the support plate to rotate, and then can drive the guide frustum to rotate. When rotating, the ring strip is used for corresponding rotational support, so that the angle rotation adjustment of the workpiece during clamping and processing can be achieved, making the processing operation more convenient. And when rotating, the ring strip and the guide frustum can be used to ensure the support stability of the workpiece during processing. Brief Description of the Drawings

[0023] The drawings are used to provide further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation to the present invention. In the drawings:

[0024] Figure 1 is the three-dimensional structure diagram of the present invention;

[0025] Figure 2 is the three-dimensional structure diagram of the adjustment mechanism of the present invention;

[0026] Figure 3 is the first three-dimensional exploded view of the operation component of the present invention;

[0027] Figure 4 is the second three-dimensional exploded view of the operation component of the present invention;

[0028] Figure 5 is the three-dimensional structure diagram of the support component of the present invention;

[0029] Figure 6 is the sectional view of the three-dimensional explosion of the clamping mechanism of the present invention;

[0030] Figure 7 is the three-dimensional structure diagram of the parts of the clamping mechanism of the present invention;

[0031] Figure 8 is the first three-dimensional exploded view of the parts of the clamping mechanism of the present invention;

[0032] Figure 9 is the second three-dimensional exploded view of the parts of the clamping mechanism of the present invention;

[0033] Figure 10 is the third three-dimensional exploded view of the parts of the clamping mechanism of the present invention;

[0034] Figure 11 is the three-dimensional exploded view of the rotation mechanism of the present invention;

[0035] Figure 12 is the three-dimensional structure diagram of the machine table of the present invention.

[0036] In the figure: 1. Machine platform; 2. Adjusting mechanism; 21. Operating component; 211. Slide; 212. I-shaped plate; 213. Support bar; 214. Cylinder; 215. Gantry cylinder; 2151. Handle; 2152. First spring; 216. Clamping bar; 217. Positioning bar; 218. Gear ring; 219. Rack; 22. Support component; 221. Round block; 222. Short column; 223. Round plate; 224. First T-shaped short rod; 225. Hollow bar; 226. Second T-shaped short rod; 227. Cross block; 228. Second spring; 3. Clamping mechanism; 31. Support plate; 32. Support block; 33. Support rod; 34. Hollow guide bar; 35. T-shaped seat; 351. Third spring; 352. T-shaped rod; 353. L-shaped plate; 354. U-shaped handle; 355. Horizontal bar; 36. Insert bar; 37. Clamping block; 38. Limit rod; 39. Clamping block; 391. Gantry frame; 393. Adjusting bolt; 4. Rotating mechanism; 41. Bottom plate; 42. Electric disc; 43. Guide frustum; 44. Ring bar. Detailed implementation mode

[0037] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0038] The present invention provides the following technical solutions:

[0039] Embodiment 1

[0040] Combined with Figures 2 to 12 , a special fixture for casting parts, including a machine platform 1, an adjusting mechanism 2 fixedly connected to the top of the machine platform 1, a clamping mechanism 3 fixedly connected to the top of the adjusting mechanism 2, and a rotating mechanism 4 fixedly connected to the bottom end of the machine platform 1;

[0041] The adjusting mechanism 2 includes an operating component 21 and a support component 22, and the support component 22 is arranged on one side of the operating component 21;

[0042] The operating component 21 includes a sliding seat 211. The sliding seat 211 is fixedly connected to the inner top end of the machine table 1. Inside the sliding seat 211, an I-shaped plate 212 is rotatably connected. Inside the I-shaped plate 212, a support bar 213 is slidably connected. On the surface of the support bar 213, a cylinder 214 is fixedly connected. On the surface of the I-shaped plate 212, a portal cylinder 215 is movably connected. On the right side of the surface of the cylinder 214, a clamping bar 216 is fixedly connected. On the left end of the surface of the cylinder 214, a handle 2151 is fixedly connected. On the inner sides of the front and rear ends of the I-shaped plate 212, first springs 2152 are respectively fixedly connected. On the right side of the top of the sliding seat 211, a positioning bar 217 is fixedly connected. On the right side of the portal cylinder 215, a rack 219 is fixedly connected. The surface of the rack 219 is meshed with a gear ring 218. A straight groove is formed inside the sliding seat 211, and the surface of the support bar 213 is slidably connected to the inside of the straight groove. Through holes are respectively formed at the front and rear ends inside the sliding seat 211. The surface of the I-shaped plate 212 passes through the through holes formed at the front and rear ends inside the sliding seat 211. A positioning hole is formed inside the positioning bar 217, and one end of the surface of the clamping bar 216 is matched with the inside of the positioning hole. A slot is formed on the right side inside the sliding seat 211, and the surface of the rack 219 is slidably connected to the inside of the slot.

[0043] Further, the support component 22 includes a round block 221. The round block 221 is fixedly connected to the inside of the gear ring 218. Inside the round block 221, a short column 222 is fixedly connected. At the top of the short column 222, a round plate 223 is fixedly connected. At the bottom end of the round plate 223, second T-shaped short rods 226 are respectively fixedly connected. On the surface of the second T-shaped short rods 226, a hollow bar 225 is rotatably connected. Inside one end of the hollow bar 225, a first T-shaped short rod 224 is rotatably connected. At the top of the first T-shaped short rod 224, a cross block 227 is rotatably connected. One end of the cross block 227 is fixedly connected with a second spring 228. There are four cross blocks 227, and the four cross blocks 227 are symmetrically distributed around the surface of the short column 222 respectively, which can play a role in fixing and releasing the fixation when clamping the workpiece. After the clamping operation is completed, release the handle 2151 and, under the elastic support of the first spring 2152, perform the positioning operation of clamping the clamping bar 216 into the inside of the positioning bar 217. Thus, the round plate 223 can be used to drive the four cross blocks 227 to move equidistantly at the same time and quickly clamp the workpiece, and can automatically perform the positioning and fixing function after clamping, and the operation is convenient and fast and easy to master.

[0044] Embodiment Two

[0045] Refer to Figures 1-12, and on the basis of the first embodiment, it is further obtained that the clamping mechanism 3 includes a support plate 31, the support plate 31 is fixedly connected to the top of the machine table 1, one end of the second spring 228 is fixedly connected to the inside of the machine table 1, the top of the circular plate 223 is rotatably connected to the bottom end of the machine table 1, the top of the support plate 31 is fixedly connected with a support block 32, there are four groups of support blocks 32, a support rod 33 is fixedly connected inside adjacent two support blocks 32, a hollow guide bar 34 is slidably connected to the surface of the support rod 33, a T-shaped seat 35 is arranged on the top of the hollow guide bar 34, an L-shaped plate 353 is arranged on the side of the T-shaped seat 35, one end of the L-shaped plate 353 is fixedly connected with a third spring 351, one end of the third spring 351 is fixedly connected with a T-shaped rod 352, there are four groups of L-shaped plates 353, a cross bar 355 is fixedly connected between adjacent two L-shaped plates 353, a U-shaped handle 354 is fixedly connected to the middle of one side of the cross bar 355, two insertion bars 36 are respectively fixedly connected to both ends of the other side of the cross bar 355, a clamping block 37 is arranged inside the T-shaped seat 35, a clamping block 39 is fixedly connected to the top of the clamping block 37, a limiting rod 38 is slidably connected inside the hollow guide bar 34, both ends of the limiting rod 38 are respectively fixedly connected with a portal frame 391, and an adjusting bolt 393 is rotatably connected inside the portal frame 391. Cross grooves are respectively opened at the four ends inside the machine table 1, and the surface of the cross block 227 is slidably connected to the inside of the cross grooves.

[0046] Further, there are four hollow guide bars 34, threaded holes are respectively opened in the middle of the left and right two hollow guide bars 34, there are two adjusting bolts 393, and the two adjusting bolts 393 are respectively threadedly connected to the inside of the left and right two hollow guide bars 34. The clamping block 37 is clamped into the top inside of the T-shaped seat 35, and then the U-shaped handle 354 is released and driven by the elastic supporting force of the third spring 351 to drive the cross bar 355 to move automatically, so that the insertion bar 36 can be clamped into the clamping block 37 for the positioning effect after replacing the clamping block 39, so that different clamping blocks 39 can be replaced for workpieces of different shapes, and clamping operations on different types of workpieces can be carried out.

[0047] Embodiment Three

[0048] Refer to Figures 1-12 , and on the basis of the first embodiment, it is further obtained that the rotating mechanism 4 includes an electric disc 42, the electric disc 42 is fixedly connected to the bottom end of the machine table 1, a bottom plate 41 is fixedly connected to the bottom end of the electric disc 42, a circular ring strip 44 is fixedly connected to the top of the bottom plate 41, and a guide circular table 43 is fixedly connected to the bottom of the machine table 1.

[0049] Furthermore, a ring groove is provided at the inner top of the guiding frustum 43, and the upper surface of the circular ring strip 44 is slidably connected to the inside of the ring groove. When the electric disc 42 is started, the support plate 31 can be driven to rotate. Then, when the guiding frustum 43 rotates, the corresponding rotational support function can be achieved by the action of the circular ring strip 44. Thus, the angle rotation adjustment of the workpiece during clamping and machining can be realized, making the machining operation more convenient. Moreover, when rotating, the circular ring strip 44 and the guiding frustum 43 can be used to improve the support stability during workpiece machining.

[0050] During the actual operation process, when this device is in use, when clamping a casting part, place the casting part workpiece on the top of the support plate 31 and clamp it. Then, rotate the handle 2151, which drives the cylinder 214 and the support bar 213 to rotate. Correspondingly, when the clamping bar 216 rotates, one end of it is driven to disengage from the clamping position inside the positioning bar 217. After that, the handle 2151 can be moved back and forth, driving the cylinder 214 and the support bar 213 to slide on the surface and inside of the I-shaped plate 212, thereby driving the portal cylinder 215 and the rack 219 to move in the front-back direction. During this process, when the gear ring 218 drives the round block 221 to rotate, the first T-shaped short rod 224 is driven to move. Then, when the hollow strip 225 moves, the cross block 227 is driven to move inside the support plate 31. Thus, the circular plate 223 can be used to drive the four cross blocks 227 to move equidistantly at the same time and quickly clamp the workpiece, making the clamping smooth. The hollow guiding strip 34 is driven to move, and correspondingly, the T-shaped seat 35 and the clamping block 39 are driven to move for the clamping operation.

[0051] In addition, during the clamping operation of the workpiece, the clamping bar 216 is inserted into the clamping position inside the positioning bar 217, so that the fixing and releasing of the workpiece during clamping can be achieved. After the clamping operation is completed, release the handle 2151, and under the elastic support of the first spring 2152, the clamping bar 216 is inserted into the clamping position inside the positioning bar 217. Thus, the clamping and fixing can be automatically carried out after clamping, and the operation is convenient, fast, and easy to master.

[0052] During this process, when clamping workpieces, the length and width dimensions of different workpieces are different, and the distances between the corresponding clamping blocks 39 are also different. At this time, the distance between the opposing clamping blocks 39 needs to be adjusted accordingly. Specifically, rotate the gantry 391 and then drive the adjusting bolt 393 to rotate, so as to drive the T-shaped seat 35 and the clamping block 39 to move, thereby adjusting the distance between the opposing clamping blocks 39 accordingly, facilitating the clamping operation of workpieces of different sizes. Additionally, for workpieces of different shapes, the clamping blocks 39 also need to be replaced correspondingly. At this time, pull the U-shaped handle 354 and drive the insertion bar 36 to move. Then replace the clamping block 39 corresponding to the notch of the workpiece and let the clamping block 37 be inserted into the top interior of the T-shaped seat 35. Then release the U-shaped handle 354, and under the elastic supporting force of the third spring 351, drive the cross bar 355 to move automatically, so as to insert the insertion bar 36 into the clamping block 37 for positioning after replacing the clamping block 39, thereby enabling the replacement of different clamping blocks 39 for workpieces of different shapes and performing the clamping operations for different types of workpieces;

[0053] Finally, when the rotation of the workpiece is required, start the electric disc 42 at this time, and then drive the support plate 31 to rotate. Further, when the guide frustum 43 rotates, the corresponding rotational support function is carried out by the action of the circular ring strip 44, so as to adjust the angle rotation of the workpiece during clamping and processing, making the processing operation more convenient. And during rotation, the circular ring strip 44 and the guide frustum 43 are used to provide the support stability for the workpiece during processing.

[0054] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or elements inherent to such process, method, article or device.

[0055] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A special fixture for casting parts, comprising a machine table (1), characterized in that: The top of the machine platform (1) is fixedly connected to an adjusting mechanism (2), the top of the adjusting mechanism (2) is fixedly connected to a clamping mechanism (3), and the bottom of the machine platform (1) is fixedly connected to a rotating mechanism (4); The adjustment mechanism (2) comprises an operating component (21) and a supporting component (22), wherein the supporting component (22) is arranged on one side of the operating component (21); The operating assembly (21) comprises a slide seat (211), the slide seat (211) is fixedly connected to the top inner side of the machine platform (1), the slide seat (211) is rotatably connected to an I-shaped plate (212) inside, the I-shaped plate (212) is slidably connected to a support bar (213) inside, a cylinder (214) is fixedly connected to the surface of the support bar (213), a door-shaped cylinder (215) is movably connected to the surface of the I-shaped plate (212), and the cylinder (214) is ) is fixedly connected to the right side of the surface of the door-shaped cylinder (215), a handle (2151) is fixedly connected to the left end of the surface of the cylinder (214), first springs (2152) are fixedly connected to the inner sides of the front and rear ends of the I-shaped plate (212), a positioning strip (217) is fixedly connected to the right side of the top of the sliding seat (211), a rack (219) is fixedly connected to the right side of the door-shaped cylinder (215), and a gear ring (218) is meshedly connected to the surface of the rack (219).

2. A special fixture for casting parts according to claim 1, characterized in that: A straight groove is provided inside the slide seat (211), the surface of the support bar (213) is slidably connected to the inside of the straight groove, through holes are respectively provided at the front and rear ends of the slide seat (211), and the surface of the I-shaped plate (212) passes through the through holes respectively provided at the front and rear ends of the slide seat (211).

3. A special fixture for casting parts according to claim 2, characterized in that: A positioning hole is provided inside the positioning strip (217), one end of the surface of the clamping strip (216) matches the inside of the positioning hole, a slot is provided on the right side inside the sliding seat (211), and the surface of the rack (219) is slidably connected to the inside of the slot.

4. A special fixture for casting parts according to claim 3, characterized in that: The support assembly (22) comprises a round block (221), wherein the round block (221) is fixedly connected to the inside of the gear ring (218), a short column (222) is fixedly connected to the inside of the round block (221), a round plate (223) is fixedly connected to the top of the short column (222), a second T-shaped short rod (226) is fixedly connected to the bottom ends of the round plates (223), a hollow bar (225) is rotatably connected to the surface of the second T-shaped short rod (226), one end of the hollow bar (225) is rotatably connected to the inside of the first T-shaped short rod (224), the top of the first T-shaped short rod (224) is rotatably connected to a cross block (227), and one end of the cross block (227) is fixedly connected to a second spring (228).

5. A special fixture for casting parts according to claim 4, characterized in that: There are four cross blocks (227), and the four cross blocks (227) are symmetrically distributed around the surface of the short column (222).

6. A special fixture for casting parts according to claim 5, characterized in that: The clamping mechanism (3) comprises a support plate (31), wherein the support plate (31) is fixedly connected to the top of the machine platform (1), one end of the second spring (228) is fixedly connected to the inside of the machine platform (1), the top of the circular plate (223) is rotatably connected to the bottom of the machine platform (1), the top of the support plate (31) is fixedly connected to a support block (32), the support blocks (32) are in four groups, two adjacent support blocks (32) are fixedly connected to the inside of support rods (33), the surface of the support rods (33) is slidably connected to a hollow guide bar (34), the top of the hollow guide bar (34) is provided with a T-shaped seat (35), the side of the T-shaped seat (35) is provided with an L-shaped plate (353), one end of the L-shaped plate (353) is fixedly connected to a third spring (3 51), one end of the third spring (351) is fixedly connected to a T-shaped rod (352), there are four groups of L-shaped plates (353), a horizontal bar (355) is fixedly connected between two adjacent L-shaped plates (353), a U-shaped handle (354) is fixedly connected in the middle of one side of the horizontal bar (355), and two ends of the other side of the horizontal bar (355) are respectively fixedly connected to inserting strips (36), a clamping block (37) is arranged inside the T-shaped seat (35), a clamping block (39) is fixedly connected to the top of the clamping block (37), a limit rod (38) is slidably connected inside the hollow guide bar (34), and two ends of the limit rod (38) are respectively fixedly connected to a door frame (391), and an adjusting bolt (393) is rotatably connected inside the door frame (391).

7. A special fixture for casting parts according to claim 6, characterized in that: The four ends of the machine platform (1) are respectively provided with cross grooves, and the surface of the cross block (227) is slidably connected with the inside of the cross groove.

8. A special fixture for casting parts according to claim 7, characterized in that: There are four hollow guide bars (34), and threaded holes are respectively provided in the middle of the left and right hollow guide bars (34). There are two adjusting bolts (393), and the two adjusting bolts (393) are respectively connected with the inner threads of the left and right hollow guide bars (34).

9. A special fixture for casting parts according to claim 8, characterized in that: The rotating mechanism (4) comprises an electric disc (42), the electric disc (42) being fixedly connected to the bottom end of the machine platform (1), the bottom end of the electric disc (42) being fixedly connected to a bottom plate (41), the top of the bottom plate (41) being fixedly connected to a circular ring (44), and the bottom of the machine platform (1) being fixedly connected to a circular guide platform (43).

10. A special fixture for casting parts according to claim 9, characterized in that: An annular groove is provided at the top of the inner part of the circular guide platform (43), and the upper surface of the circular ring strip (44) is slidably connected to the inner part of the annular groove.

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