Machining clamp for cavity type casting parts

Abstract

The invention relates to the technical field of mechanical clamp production and machining, in particular to a cavity type casting part machining clamp which comprises a horizontally-arranged base, a vertical mounting column suspended above the base and a shear type telescopic frame on the peripheral wall of the mounting column, and four containing grooves are formed in the peripheral wall of the mounting column at equal angles at intervals. The telescopic frame comprises two upper ends and two lower ends, the two upper ends and the two lower ends are located at the two ends in the length direction, the two ends of the telescopic frame are respectively provided with a screw rod, and the two ends of the telescopic frame are respectively provided with a screw rod. The upper end and the lower end of one side of the telescopic frame are located in the containing groove and are in threaded connection with the lead screw through sleeves, the four driving motors independently drive the lead screw to control the telescopic frame to stretch out and draw back, and the side, away from the mounting column, of the telescopic frame is detachably provided with an abutting assembly through a connecting assembly. And the effects that independent clamping is carried out in multiple directions, and clamping is more stable through mutual cooperation are achieved.

Description

Technical Field

[0001] The present application relates to the technical field of production and processing of mechanical fixtures, and in particular to a machining fixture for cavity casting parts. Background Art

[0002] At present, mechanical parts need to undergo a series of subsequent processing after forming, such as grinding and polishing, anti-corrosion and rust-proof spraying, testing and inspection, etc. The device used to fix the processing object in the manufacturing process so that it occupies the correct position to accept construction or inspection is generally called a fixture.

[0003] Existing cavity casting parts often have complex internal structures, including irregular inner walls and internal convex columns, etc., which cannot be effectively fixed and supported by external clamping alone, which may cause the parts to move or deform during processing, affecting the processing accuracy and quality. The fixture clamps the cavity casting parts internally through synchronously retractable clamping parts.

[0004] The above-mentioned prior art solutions have the following defects: when the existing clamps are clamping cavity casting parts, the inner wall of the parts has an irregular shape, and the clamps that clamp simultaneously may touch the inner wall of the parts on one side while the other side has not yet touched it, resulting in the clamp being unable to clamp the parts. Therefore, the staff is required to repeatedly move the parts to adjust their positions. The overall weight of the parts is large, and it is more laborious for the staff to manually adjust them. During the adjustment process, the staff judges the position of the parts in real time based on experience, which is inefficient. Summary of the invention

[0005] The present application provides a machining fixture for cavity casting parts in order to independently clamp in multiple directions and cooperate with each other to make the clamping more stable.

[0006] The above technical objectives of this application are achieved through the following technical solutions: A machining fixture for cavity casting parts, comprising a horizontally arranged base, a vertical mounting column suspended above the base and a scissor-type telescopic frame on the peripheral wall of the mounting column, wherein four accommodating grooves are arranged at equal angles on the peripheral wall of the mounting column, and lead screws are rotatably arranged in the accommodating grooves, and four driving motors are arranged on the upper end surface of the mounting column. The four output shafts of the driving motors penetrate into the mounting column and are coaxially fixed to the upper ends of the four lead screws respectively, and the telescopic frame comprises four end portions, two upper ends and two lower ends at both ends in the length direction, and the upper end and the lower end on one side of the telescopic frame are located in the accommodating groove and are threadedly connected to the lead screw through a sleeve, and the four driving motors independently drive the lead screws to control the telescopic frame to extend and retract, and a tightening assembly is detachably arranged on the side of the telescopic frame away from the mounting column through a connecting assembly.

[0007] By adopting the above technical scheme, the parts are placed on the base by arranging a base, a mounting column, a driving motor, a lead screw, a telescopic frame and a clamping assembly, and the mounting column is located inside the parts. Since the inner wall of the parts is irregular, the telescopic frames in different directions are unfolded by independently controlled driving motors, and multiple telescopic frames are used to independently extend and retract inside the cavity casting parts in a single direction. The parts are clamped by multiple telescopic frames cooperating with each other. Compared with synchronous clamping, which requires staff to repeatedly adjust the position of parts, independent clamping can quickly fix the parts with higher efficiency, and the clamping assembly can adapt to the irregular inner wall of the parts and fit tightly to the inner wall, thereby enhancing the clamping effect.

[0008] Optionally, the end side wall of the telescopic frame close to the mounting column is slidably fitted with the side wall of the accommodating groove.

[0009] By adopting the above technical solution, the end of the telescopic frame that is in contact with the side wall of the accommodating groove can reduce shaking during the telescopic frame's extension and retraction process.

[0010] Optionally, two mounting plates with surfaces parallel to each other and spaced apart are vertically arranged on the upper surface of the base, sliding grooves are provided on the opposite surfaces of the mounting plates, a horizontal sliding plate is slidably arranged between the mounting plates, a protrusion is provided on the end surface of the sliding plate, the protrusion is adapted to the sliding groove and the protrusion is slidably arranged in the sliding groove, an electric push rod is provided on the upper surface of the mounting plate, the push rod of the electric push rod penetrates into the mounting plate and is fixedly connected to the protrusion of the sliding plate, a hydraulic push rod is provided on the upper surface of the sliding plate, the push rod of the hydraulic push rod penetrates into the sliding plate and is coaxially fixedly connected to the upper end surface of the mounting column.

[0011] By adopting the above technical solution, by setting up a sliding plate and a hydraulic push rod, the parts are placed on the base, the height of the mounting column is raised by the sliding plate, the telescopic frame is retracted by the driving motor, and the mounting column is placed inside the parts by the hydraulic push rod, so that parts of different specifications can be clamped and fixed.

[0012] Optionally, both ends of the telescopic frame away from the mounting column are hinged with a U-shaped connecting frame, a vertical connecting plate is provided on the side of the connecting frame away from the telescopic frame, a vertical clamping plate is detachably connected to the side of the connecting plate away from the connecting frame, and the end of the connecting frame is hinged to the connecting plate.

[0013] By adopting the above technical solution and setting up a plug-in plate, the surface of the clamping plate contacting the inner wall of the cavity casting component needs to withstand greater pressure during the process of clamping the cavity casting component. During long-term use, the detachable clamping plate is convenient for replacement and maintenance of the clamping plate.

[0014] Optionally, a square hole is provided on the plate surface of the connecting plate facing away from the connecting frame, the square hole has an opening on the side wall of the connecting plate, plug-in grooves are provided on the two side walls opposite to each other of the square hole, and a plug-in plate is provided on the plate surface of the clamping plate close to the connecting plate through a vertical square column, the plug-in plate is adapted to the plug-in groove and the square hole, and the plug-in plate can be plugged into the square hole and the plug-in groove.

[0015] By adopting the above technical solution and setting up a plug-in plate, the surface of the clamping plate contacting the inner wall of the cavity casting component needs to withstand greater pressure during the process of clamping the cavity casting component. During long-term use, the detachable clamping plate is convenient for replacement and maintenance of the clamping plate.

[0016] Optionally, a rubber block is provided on the surface of the clamping plate facing away from the connecting plate, and a plurality of step holes are opened on the surface of the rubber block that is in contact with the clamping plate. A plurality of groups of adjusting bolts are provided on the clamping plate, and the plurality of groups of adjusting bolts are inserted into the clamping plate. The ends of the adjusting bolts are rotatably arranged in the step holes of the rubber block, and the adjusting bolts are threadedly connected to the clamping plate.

[0017] By adopting the above technical solution, by setting adjusting bolts and rubber blocks, the surface of the rubber block contacts the inner wall of the irregular component, the clamping plate and the rubber block are removed from the connecting plate, and multiple groups of adjusting bolts are rotated to adjust the distance between the rubber block and the clamping plate. When clamping the irregular inner wall of the component, the inner wall of the component is tightly clamped by adjusting the shape of the rubber block.

[0018] Optionally, a fixing rod is slidably provided on the upper part of the connecting plate, fixing grooves are spaced apart next to the plug-in grooves on the upper side wall of the connecting plate, a fixing piece is provided on the side wall of the connecting plate that is fitted with the fixing rod, the fixing piece is slidably provided in the fixing groove, a spring is provided in the fixing groove on the side of the fixing piece away from the clamping plate, and both ends of the spring are respectively fixedly connected to the end wall of the fixing groove and the side wall of the fixing piece.

[0019] By adopting the above technical solution and setting a fixing rod, the plug-in board inserted into the connecting plate can be fixed, thereby reducing the possibility of the clamping plate being detached from the connecting plate during use. The spring enables the fixing column to be automatically fixed and at the same time fixes the fixing rod to the upper part of the connecting plate.

[0020] Optionally, two hinged columns are spaced apart on opposite side walls of the connecting plate, and ends of the connecting frame at both ends of the telescopic frame away from the mounting column are hinged to the peripheral wall of the hinged column.

[0021] By adopting the above technical solution, the hinged column arranged on the side wall of the connecting plate is more stable compared to the direct sliding hinge connection between the end of the telescopic frame and the surface of the connecting plate.

[0022] Optionally, a PLC processor is provided on a plate surface opposite to the mounting plate, and the PLC processor is electrically connected to both the electric push rod and the drive motor.

[0023] By adopting the above technical solution and setting a PLC processor, the electric push rod and the drive motor can be controlled more accurately, thereby improving the clamping efficiency.

[0024] Optionally, the driving motor adopts a stepper motor.

[0025] By adopting the above technical solution, the stepper motor has good control performance, so that the lead screw can be stably rotated.

[0026] In summary, this application has the following technical effects: 1. The parts are placed on the base by setting up a base, a mounting column, a driving motor, a lead screw, a telescopic frame and a clamping assembly. The mounting column is located inside the parts. Since the inner wall of the parts is irregular, the telescopic frames in different directions are unfolded by an independently controlled driving motor. Multiple telescopic frames are used to independently extend and retract in a single direction inside the cavity casting parts. The parts are clamped by multiple telescopic frames cooperating with each other. Compared with synchronous clamping, which requires staff to repeatedly adjust the position of parts, independent clamping can quickly fix the parts with higher efficiency. The clamping assembly can adapt to the irregular inner wall of the parts and fit the inner wall tightly, thereby enhancing the clamping effect. 2. By setting the adjusting bolts and rubber blocks, when the surface of the rubber block contacts the inner wall of the irregular parts, remove the clamping plate and the rubber block from the connecting plate, rotate multiple sets of adjusting bolts to adjust the distance between the rubber block and the clamping plate, and when clamping the inner wall of the irregular parts, adjust the shape of the rubber block to tightly clamp the inner wall of the parts; 3. By setting up a PLC processor, the electric push rod and drive motor can be controlled more accurately to improve the clamping efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is the appearance structure diagram of this application; Figure 2 It is a prominent structural diagram of the tightening component and the connecting component of the present application.

[0028] Explanation of the reference numerals: 1. Support assembly; 11. Base; 12. Mounting plate; 121. Sliding groove; 13. Sliding plate; 14. Electric push rod; 2. Independent telescopic assembly; 21. Mounting column; 211. Accommodating groove; 22. Lead screw; 23. Driving motor; 24. Telescopic frame; 25. Sleeve; 26. Connecting frame; 3. Clamping assembly; 31. Connecting plate; 311. Square hole; 312. Plug-in groove; 313. Fixing groove; 32. Clamping plate; 33. Rubber block; 34. Adjusting bolt; 4. Connecting assembly; 41. Plug-in plate; 42. Fixing rod; 43. Fixing piece; 5. PLC processor. DETAILED DESCRIPTION

[0029] The present application is further described in detail below in conjunction with the accompanying drawings.

[0030] The present application embodiment discloses a machining fixture for cavity casting parts, referring to Figure 1 The processing fixture includes a support component 1, an independent telescopic component 2, a clamping component 3 and a connecting component 4. The support component 1 can support the independent telescopic component 2, the clamping component 3, the connecting component 4 and the cavity casting parts. The independent telescopic component 2 can be independently retracted in a single direction inside the cavity casting parts, and the parts are clamped by multiple telescopic structures. Compared with synchronous clamping, which requires the staff to repeatedly adjust the position of the parts, independent clamping can quickly fix the parts. The clamping component 3 can adapt to the irregular inner wall of the parts and fit the inner wall tightly, thereby enhancing the clamping effect. The connecting component 4 allows the clamping component 3 to be detachably connected to the independent telescopic component 2, which is convenient for repairing and replacing the clamping component 3.

[0031] Reference Figure 1 The support assembly 1 includes a horizontally arranged base 11, two mounting plates 12 located on the upper surface of the base 11 and spaced from each other and both vertically arranged, an electric push rod 14 arranged on the upper end surface of the mounting plate 12, a sliding plate 13 slidably arranged between the two mounting plates 12 and arranged horizontally, and a hydraulic push rod arranged above the sliding plate 13. The mounting plates 12 are parallel to each other. The two mounting plates 12 are respectively located at the edges of the upper surfaces of the two opposite sides of the base 11. The two mounting plates 12 are provided with a strip-shaped sliding groove 121 on the opposite plate surfaces. The length direction of the sliding groove 121 is parallel to the length direction of the mounting plate 12. The end of the sliding plate 13 is provided with a protrusion adapted to the sliding groove 121 and the protrusion is slidably arranged in the sliding groove 121. The housing of the electric push rod 14 is fixedly connected to the upper end surface of the mounting plate 12, and the push rod of the electric push rod 14 penetrates the mounting plate 12. The end of the push rod is located in the sliding groove 121 and is fixedly connected to the surface of the protrusion of the sliding plate 13 away from the base 11. The hydraulic push rod housing is arranged on the upper surface of the sliding plate 13 , the push rod of the hydraulic push rod penetrates into the sliding plate 13 , and the end of the push rod is located between the sliding plate 13 and the base 11 .

[0032] Reference Figure 1The independent telescopic assembly 2 includes a mounting column 21 vertically arranged at the lower part of the hydraulic push rod push rod and located between the sliding plate 13 and the base 11, four lead screws 22 rotatably arranged inside the mounting column 21, a driving motor 23 arranged on the upper end surface of the mounting column 21, and four telescopic frames 24 arranged on the peripheral wall of the mounting column 21. The mounting column 21 is a cylinder, the upper end surface of the mounting column 21 is fixedly connected to the end of the push rod of the hydraulic push rod, and the mounting column 21 is coaxially arranged with the push rod of the hydraulic push rod. Four strip-shaped receiving grooves 211 are opened on the peripheral wall of the mounting column 21, and the length direction of the receiving grooves 211 is parallel to the length direction of the mounting column 21. The four receiving grooves 211 are opened at equal angles on the peripheral wall of the mounting column 21 with the axis of the mounting column 21 as the center.

[0033] Referring to the figure, the lead screw 22 is rotatably arranged in the receiving groove 211, the length direction of the lead screw 22 is parallel to the length direction of the mounting column 21, and the two ends of the lead screw 22 are respectively rotatably embedded in the two end walls of the receiving groove 211, and the peripheral wall of the lead screw 22 is spaced apart from the groove wall of the receiving groove 211. Four drive motors 23 are provided, and the output shafts of the four drive motors 23 penetrate the mounting column 21 and are respectively coaxially fixed to the upper end faces of the four lead screws 22. The drive motor 23 adopts a stepper motor, which has good control performance, so that the lead screw 22 can be stably rotated.

[0034] Reference Figure 1 The telescopic frame 24 is a scissor-type telescopic frame 24. One end of the telescopic frame 24 in the length direction is arranged in the accommodating groove 211. The telescopic frame 24 includes four ends, two upper ends and two lower ends. The upper end and the lower end of the telescopic frame 24 located in the accommodating groove 211 are both hinged with a sleeve 25 through a connecting block. The sleeves 25 at the upper and lower ends of the telescopic frame 24 located in the accommodating groove 211 are coaxially sleeved on the lead screw 22. A thread is arranged on the inner wall of the sleeve 25. The inner wall of the sleeve 25 is threadedly connected with the peripheral wall of the lead screw 22. The threads in the sleeve 25 at the upper and lower ends of the telescopic frame 24 located in the accommodating groove 211 are in opposite directions. The end side wall of the telescopic frame 24 located in the accommodating groove 211 slides and fits with the side wall of the accommodating groove 211.

[0035] Combination Figure 1 and Figure 2 The clamping assembly 3 includes a connecting plate 31 arranged at the end of the telescopic frame 24 away from the mounting column 21 and a clamping plate 32 arranged on the side of the connecting plate 31 away from the telescopic frame 24. The connecting plate 31 is vertically arranged, and two spaced-apart hinge columns are arranged on the opposite side walls of the connecting plate 31. The axis of the hinge column is perpendicular to the side wall of the connecting plate 31. The upper and lower ends of the telescopic frame 24 away from the mounting column 21 are hinged with a U-shaped connecting frame 26. The U-shaped opening of the connecting frame 26 faces away from the telescopic frame 24, and the two ends of the connecting frame 26 are respectively rotatably sleeved on the hinge columns on the side wall of the connecting plate 31.

[0036] Combination Figure 1 and Figure 2 The clamping plate 32 and the connecting plate 31 are detachably connected through the connecting component 4. The clamping plate 32 is vertical in length direction. A rubber block 33 matching the structure of the clamping plate 32 is arranged on the plate surface of the clamping plate 32 away from the connecting plate 31. The rubber block 33 is fitted with a plurality of stepped holes of a circular structure on the surface of the clamping plate 32. A plurality of groups of adjusting bolts 34 are arranged on the plate surface opposite to the connecting plate 31. A group of adjusting bolts 34 are evenly spaced on the plate surface of the clamping plate 32 in a direction parallel to the axis of the mounting column 21. The plurality of groups of adjusting bolts 34 are distributed in a rectangular shape on the plate surface of the clamping plate 32. The adjusting bolts 34 penetrate into the clamping plate 32. The ends of the adjusting bolts 34 are embedded in the stepped holes of the rubber block 33 by a sliding fit. The distance between the rubber block 33 and the clamping plate 32 is adjusted by rotating the plurality of adjusting bolts 34. When clamping the inner wall of an irregular component, the component is tightly clamped by adjusting the shape of the rubber block 33.

[0037] Combination Figure 1 and Figure 2 The connecting component 4 includes a plug-in plate 41 arranged on one side of the clamping plate 32 close to the connecting plate 31. The plug-in plate 41 and the clamping plate 32 are connected through a vertically arranged square column. The board surfaces of the plug-in plate 41 and the clamping plate 32 are parallel and spaced apart. The plug-in plate 41 and the multiple groups of adjusting bolts 34 do not interfere with each other. A square hole 311 is provided on the board surface of the connecting plate 31 close to the clamping plate 32. The square hole 311 has an opening on the upper side wall of the connecting plate 31. Both side walls of the square hole 311 close to the hinge column are provided with plug-in grooves 312. The plug-in grooves 312 are adapted to the side walls of the plug-in plate 41 and the two sides of the plug-in plate 41 that are able to be separated from each other can be plugged into the plug-in grooves 312.

[0038] Combination Figure 1 and Figure 2 A fixing rod 42 is slidably provided on the upper part of the connecting plate 31. The fixing rod 42 is a square column. The length direction of the fixing rod 42 is perpendicular to the length direction of the clamping plate 32. The two end faces of the fixing rod 42 are flush with the side wall of the connecting plate 31 provided with the hinge column. The two sides of the plug-in groove 312 on the side wall of the connecting plate 31 are spaced apart with fixing grooves 313. The length direction of the fixing groove 313 is perpendicular to the plate surface of the connecting plate 31. The fixing rod 42 is attached to the side wall of the connecting plate 31. The fixing parts 43 are slidably provided in the fixing groove 313. 13, a spring is provided in the fixing groove 313 on the side of the fixing member 43 away from the clamping plate 32, one end of the spring is fixedly connected to the side wall of the fixing member 43, and the other end is fixedly connected to the end wall of the fixing groove 313. When the plug-in board 41 is inserted into the plug-in groove 312, the fixing rod 42 is slid away from the clamping plate 32 to compress the spring. After the plug-in board 41 is inserted into the plug-in groove 312 and the square hole 311, the fixing rod 42 is released, and the spring is released to reset the fixing rod 42, and the fixing rod 42 fixes the plug-in board 41 to the connecting plate 31.

[0039] Combination Figure 1 and Figure 2 A PLC processor 5 is arranged on the surface of a mounting plate 12 away from the sliding plate 13. The PLC processor 5 is electrically connected to the electric push rod 14, the hydraulic push rod and the drive motor 23. When clamping cavity casting parts, the electric push rod 14 is controlled by the PLC processor 5 to make the sliding plate 13 drive the independent telescopic component 2 and the clamping component 3 to rise, and the parts are placed on the base 11. The independent telescopic component 2 and the clamping component 3 are driven by the hydraulic push rod to extend into the interior of the parts. At this time, the drive motor 23 drives the telescopic frame 24 to retract. When the independent telescopic component 2 extends into the interior of the parts, due to the irregular inner wall of the parts, the telescopic frames 24 in different directions are unfolded by the independently controlled drive motor 23. Compared with the synchronous clamping that requires multiple adjustments to the position of the parts, independent control efficiency is higher. The telescopic frame 24 is unfolded to make the clamping plate 32 and the rubber block 33 contact the irregular inner wall of the part. Due to the irregular inner wall, the contact area between the rubber block 33 on the clamping plate 32 and the component is small, resulting in unstable clamping. The clamping component 3 is removed from the telescopic component through the connecting component 4, and the position of the rubber block 33 is adjusted by adjusting the bolt 34. Then, the clamping component 3 is reinstalled on the telescopic component. The adjusted rubber block 33 has a larger contact area with the inner wall of the component and the clamping is more stable.

[0040] This specific embodiment is merely an explanation of the present application and is not a limitation of the present application. After reading this specification, those skilled in the art may make modifications to the present embodiment without any creative contribution as needed, but such modifications are protected by the patent law as long as they are within the scope of the claims of the present application.

Claims

1. A machining fixture for cavity casting parts, characterized in that: The utility model comprises a horizontally arranged base (11), a vertically arranged mounting column (21) suspended above the base (11), and a scissor-type telescopic frame (24) on the peripheral wall of the mounting column (21), wherein four receiving grooves (211) are arranged on the peripheral wall of the mounting column (21) at equal angles, and lead screw rods (22) are rotatably arranged in the receiving grooves (211), and four driving motors (23) are arranged on the upper end surface of the mounting column (21), and the output shafts of the four driving motors (23) penetrate into the mounting column (21) and are respectively connected to the four lead screw rods (22). The upper end of the screw rod (22) is coaxially fixed, and the telescopic frame (24) comprises four end portions, two upper ends and two lower ends at both ends in the length direction. The upper end and the lower end on one side of the telescopic frame (24) are located in the receiving groove (211) and are threadedly connected to the lead screw rod (22) through a sleeve (25). The four driving motors (23) all independently drive the lead screw rod (22) to control the telescopic frame (24) to extend and retract. The telescopic frame (24) is detachably provided with a tightening assembly (3) on one side away from the mounting column (21) through a connecting assembly (4).

2. A machining fixture for cavity casting parts according to claim 1, characterized in that: The end side wall of the telescopic frame (24) close to the mounting column (21) is slidably fitted with the side wall of the receiving groove (211).

3. A machining fixture for cavity casting parts according to claim 2, characterized in that: Two mounting plates (12) with parallel and spaced surfaces are vertically arranged on the upper surface of the base (11); sliding grooves (121) are provided on the opposite surfaces of the mounting plates (12); a horizontal sliding plate (13) is slidably arranged between the mounting plates (12); a protrusion is arranged on the end surface of the sliding plate (13); the protrusion is adapted to the sliding groove (121) and the protrusion is slidably arranged in the sliding groove (121); an electric push rod (14) is arranged on the upper end surface of the mounting plate (12); the push rod of the electric push rod (14) penetrates into the mounting plate (12) and is fixedly connected to the protrusion of the sliding plate (13); a hydraulic push rod is arranged on the upper surface of the sliding plate (13); the push rod of the hydraulic push rod penetrates into the sliding plate (13) and is coaxially fixedly connected to the upper end surface of the mounting column (21).

4. A machining fixture for cavity casting parts according to claim 3, characterized in that: Both ends of the telescopic frame (24) away from the mounting column (21) are hingedly connected to a U-shaped connecting frame (26); a vertical connecting plate (31) is arranged on the side of the connecting frame (26) away from the telescopic frame (24); a vertical clamping plate (32) is detachably connected to the side of the connecting plate (31) away from the connecting frame (26); and the end of the connecting frame (26) is hingedly connected to the connecting plate (31).

5. The machining fixture for cavity casting parts according to claim 4, characterized in that: A square hole (311) is provided on the plate surface of the connecting plate (31) facing away from the connecting frame (26); the square hole (311) is provided with an opening on the upper side wall of the connecting plate (31); two opposite side walls of the square hole (311) are provided with plug-in grooves (312); a plug-in plate (41) is provided on the plate surface of the clamping plate (32) close to the connecting plate (31) through a vertical square column; the plug-in plate (41) is adapted to the plug-in groove (312) and the square hole (311), and the plug-in plate (41) can be plugged into the square hole (311) and the plug-in groove (312).

6. The machining fixture for cavity casting parts according to claim 5, characterized in that: A rubber block (33) is arranged on the plate surface of the clamping plate (32) facing away from the connecting plate (31), and a plurality of stepped holes are opened on the surface of the rubber block (33) that is in contact with the clamping plate (32). A plurality of groups of adjusting bolts (34) are arranged on the clamping plate (32), and the plurality of groups of adjusting bolts (34) are inserted into the clamping plate (32). The ends of the adjusting bolts (34) are rotatably arranged in the stepped holes of the rubber block (33), and the adjusting bolts (34) are threadedly connected to the clamping plate (32).

7. The machining fixture for cavity casting parts according to claim 6, characterized in that: A fixing rod (42) is slidably arranged on the upper part of the connecting plate (31), and a fixing groove (313) is spaced apart beside the plug-in groove (312) on the upper side wall of the connecting plate (31), and a fixing member (43) is arranged on the side wall of the connecting plate (31) where the fixing rod (42) is in contact with the connecting plate (31), and the fixing member (43) is slidably arranged in the fixing groove (313), and a spring is arranged in the fixing groove (313) on the side of the fixing member (43) facing away from the clamping plate (32), and two ends of the spring are respectively fixed to the end wall of the fixing groove (313) and the side wall of the fixing member (43).

8. The machining fixture for cavity casting parts according to claim 7, characterized in that: Two hinged columns are arranged at intervals on the opposite side walls of the connecting plate (31), and the ends of the connecting frames (26) at both ends of the telescopic frame (24) away from the installation column (21) are hinged to the peripheral wall of the hinged column.

9. The machining fixture for cavity casting parts according to claim 8, characterized in that: A PLC processor (5) is arranged on the plate surface opposite to the mounting plate (12), and the PLC processor (5) is electrically connected to the electric push rod (14) and the drive motor (23).

10. A machining fixture for cavity casting parts according to claim 9, characterized in that: The driving motor (23) is a stepping motor.

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