Closed door type double-crankshaft precision steel frame punching machine

Abstract

The closed door type double-crankshaft precision steel frame punching machine comprises a first machine frame and a second machine frame, a double-crankshaft punching machine is fixedly connected between the first machine frame and the second machine frame, a supporting seat is fixedly connected between the first machine frame and the second machine frame, a punching table is fixedly connected to the upper side of the supporting seat, and the punching table is fixedly connected to the lower side of the supporting seat. And the double-crankshaft punching machine is communicated with a control box. According to the cleaning device, an operator does not need to stay hands below the double-crankshaft punching machine for cleaning operation, the cleaning convenience of the closed door type double-crankshaft precision steel frame punching machine is effectively improved, the labor intensity of the operator is effectively reduced, the use safety of the closed door type double-crankshaft precision steel frame punching machine can be improved, and the labor intensity of the operator is reduced. The problem of sonic boom caused by air existing between a plate and the punching table during punching can be avoided, and noise generated when the closed door type double-crankshaft precision steel frame punching machine works is effectively reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of punching presses, and particularly to a closed-door type double-crank precision steel-frame punching press. Background Art

[0002] A punching press is a stamping press. In national production, the stamping process has the advantages of saving materials and energy compared with traditional machining, high efficiency, low technical requirements for operators, and the ability to produce products that cannot be achieved by machining through various die applications. Therefore, its uses are becoming more and more extensive. Among them, the closed-door type double-crank steel-frame punching press is a commonly used punching press that can perform rapid stamping processing on plates.

[0003] After the existing closed-door type double-crank steel-frame punching press completes stamping, stamping waste chips will be left on the stamping table. These stamping waste chips remaining on the stamping table will affect the next stamping. Therefore, it is necessary for the operator to clean up the stamping waste chips in a timely manner. The cleaning method of the stamping waste chips of the existing closed-door type double-crank steel-frame punching press is that the operator manually sweeps the stamping waste chips on the stamping table. This sweeping method requires the operator to use tools to bend down for reciprocating sweeping actions, resulting in an increase in the operator's work intensity, and the operator's hand needs to be placed under the stamping die, which is prone to safety accidents. Summary of the Invention

[0004] The purpose of the present invention is to provide a closed-door type double-crank precision steel-frame punching press to solve the problems raised in the above background art.

[0005] To achieve the above purpose, the present invention provides the following technical solutions:

[0006] The present invention provides a closed-door type double-crank precision steel-frame punching press, including a first frame and a second frame. A double-crank punching machine is fixedly connected between the first frame and the second frame. A support seat is fixedly connected between the first frame and the second frame. A stamping table is fixedly connected to the upper side of the support seat. A control box is communicated with the double-crank punching machine. A cleaning mechanism is fixedly connected to the vertical side wall of the double-crank punching machine. A noise reduction component is connected to the first frame;

[0007] The cleaning mechanism includes two fixing plates symmetrically and fixedly connected to the vertical side walls of the double-crank press. Fixed cylinders are fixedly connected to both of the two fixing plates. Rotating shafts are rotatably connected to the two fixed cylinders through bearings. The same U-shaped rod is fixedly connected between the two rotating shafts. Two mounting plates are symmetrically and fixedly connected to the double-crank press. Compression springs corresponding to the U-shaped rod are fixedly connected to both of the two mounting plates. The compression springs are located above the U-shaped rod. An installation sleeve is fixedly sleeved on the horizontal rod wall of the U-shaped rod. A cleaning scraper is fixedly connected to the outer wall of the installation sleeve. A plurality of pin holes are evenly formed in the cleaning scraper, and flexible brushes are fixedly connected in the pin holes. The length of the flexible brush is greater than the distance between the double-crank press and the punching table. A plurality of counterweight balls are evenly fixedly connected to the outer wall of the installation sleeve. A U-shaped grip is fixedly connected to the outer wall of the installation sleeve. The U-shaped grip is located at the middle position of the installation sleeve. A limiting mechanism for limiting the U-shaped rod is installed on the first frame. A blowing and cleaning mechanism is fixedly connected to the second frame;

[0008] The blowing and cleaning mechanism includes a booster fan fixedly connected to the second frame. An intake pipe is fixedly communicated with the air inlet of the booster fan. An outlet pipe is fixedly communicated with the air outlet of the booster fan. A shunt pipe is fixedly communicated with the outlet pipe. A plurality of jet heads are fixedly communicated with the shunt pipe. The nozzles of the plurality of jet heads are flush with the upper side of the punching table.

[0009] Furthermore, the noise reduction component includes a spray pipe fixedly connected to the first frame. A plurality of spray heads are evenly fixedly communicated with the side of the spray pipe close to the punching table. A booster water pump is fixedly connected to the first frame. A water guide pipe is fixedly communicated between the water outlet of the booster water pump and the spray pipe. A water inlet pipe is fixedly communicated with the water inlet of the booster water pump.

[0010] Furthermore, two threaded holes are symmetrically formed in the upper sides of the first frame and the second frame. A stud is threadedly sleeved in the threaded hole. The upper end of the stud extends out of the threaded hole and is fixedly connected with a lifting ring.

[0011] Furthermore, the limiting mechanism includes a sliding hole formed in the first frame. A limiting rod is movably inserted into the sliding hole. Both ends of the limiting rod extend out of the sliding hole. A U-shaped plate is fixedly connected to the vertical side wall of the first frame. A jack is formed in the U-shaped plate. The limiting rod passes through the U-shaped plate through the jack. A retaining ring is fixedly sleeved on the rod wall of the limiting rod. A spring is fixedly connected between the retaining ring and the U-shaped plate. The spring is movably sleeved on the limiting rod. One end of the limiting rod is fixedly connected with a pull rod.

[0012] Furthermore, bases are fixedly connected to the lower sides of the first frame and the second frame. Grooves are formed in the bases.

[0013] Further, an L-shaped clamping plate is fixedly connected to the U-shaped plate, and a clamping groove corresponding to the pull rod is formed in the L-shaped clamping plate.

[0014] Further, the water guide pipe includes a first water pipe fixedly communicated with the spray pipe, the water outlet of the booster water pump is fixedly communicated with a second water pipe, and a water stop valve is fixedly communicated between the first water pipe and the second water pipe.

[0015] Further, the same support plate is fixedly connected between the two bases, and the side wall on the upper side of the support plate is in close fit with the side wall on the lower side of the support seat.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0017] 1. Through the cleaning mechanism provided in the present invention, it is not necessary for the operator to stay under the double-crank press to perform cleaning operations, which effectively improves the convenience of cleaning the closed-door type double-crank precision steel frame press, effectively reduces the labor intensity of the operator, and can improve the use safety of the closed-door type double-crank precision steel frame press.

[0018] 2. Through the noise reduction component provided in the present invention, it is possible to avoid the problem of sonic boom caused by the existence of air between the plate and the punching table during punching, and effectively reduce the noise during the operation of the closed-door type double-crank precision steel frame press.

[0019] 3. Through the threaded holes, stud bolts and lifting rings provided in the present invention, during use, the multiple lifting rings provided are convenient for connecting with lifting equipment, which can improve the convenience of lifting the closed-door type double-crank precision steel frame press, thereby improving the convenience of handling the closed-door type double-crank precision steel frame press, and by rotating the stud bolts, the opening direction and height of the lifting rings can be adjusted according to actual lifting requirements, effectively improving the flexibility of lifting. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a schematic diagram of the overall structure of the present invention;

[0021] Figure 2 is a schematic diagram of the structure of the present invention in another direction;

[0022] Figure 3 is the front view of the present invention;

[0023] Figure 4 is Figure 1 the schematic diagram of the structure of the cleaning mechanism in

[0024] Figure 5 is Figure 1 the schematic diagram of the structure of the noise reduction component in

[0025] Figure 6 is Figure 1 the structural schematic diagram of the middle limiting mechanism;

[0026] Figure 7 is Figure 1 the structural schematic diagram of the first frame in the middle;

[0027] Figure 8 is Figure 1 the structural schematic diagram of the connection structure between the stud and the lifting ring in the middle;

[0028] Figure 9 is Figure 3 the structural schematic diagram of part A in the middle;

[0029] Figure 10 is Figure 1 the structural schematic diagram of the blowing and cleaning mechanism in the middle.

[0030] In the figure: 1. First frame; 2. Second frame; 3. Double-crank press; 4. Support seat; 5. Stamping table; 6. Control box; 7. Fixed plate; 8. Fixed cylinder; 9. Rotating shaft; 10. U-shaped rod; 11. Installation sleeve; 12. Flexible brush; 13. Counterweight ball; 14. Spray pipe; 15. Nozzle; 16. Booster water pump; 17. Water guide pipe; 18. Water inlet pipe; 19. Threaded hole; 20. Stud; 21. Lifting ring; 22. Sliding hole; 23. Limiting rod; 24. U-shaped plate; 25. Jack; 26. Retaining ring; 27. Spring; 28. Pull rod; 29. Base; 30. Groove; 31. L-shaped clamping plate; 32. Card slot; 33. First water pipe; 34. Second water pipe; 35. Water stop valve; 36. Support plate; 37. Cleaning scraper; 38. U-shaped grip; 39. Installation plate; 40. Compression spring; 41. Booster fan; 42. Air inlet pipe; 43. Air outlet pipe; 44. Shunt pipe; 45. Jet head. Specific embodiments

[0031] 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.

[0032] Please refer to Figure 1-10, the present invention provides a closed - door - type double - crank precision steel - frame punching machine, which includes a first frame 1 and a second frame 2. A double - crank punching machine 3 is fixedly connected between the first frame 1 and the second frame 2. A support base 4 is fixedly connected between the first frame 1 and the second frame 2. A punching table 5 is fixedly connected to the upper side of the support base 4. A control box 6 is communicated with the double - crank punching machine 3. A cleaning mechanism is fixedly connected to the vertical side wall of the double - crank punching machine 3. A noise - reduction component is connected to the first frame 1;

[0033] The cleaning mechanism includes two fixing plates 7 symmetrically and fixedly connected to the vertical side walls of the double - crank punching machine 3. Fixing cylinders 8 are fixedly connected to both of the two fixing plates 7. Rotating shafts 9 are rotatably connected to both of the two fixing cylinders 8 through bearings. The same U - shaped rod 10 is fixedly connected between the two rotating shafts 9. Two mounting plates 39 are symmetrically and fixedly connected to the double - crank punching machine 3. Compression springs 40 corresponding to the U - shaped rod 10 are fixedly connected to both of the two mounting plates 39. The compression springs 40 are located above the U - shaped rod 10. An installation sleeve 11 is fixedly sleeved on the horizontal rod wall of the U - shaped rod 10. A cleaning scraper 37 is fixedly connected to the outer wall of the installation sleeve 11. A plurality of pin holes are evenly formed in the cleaning scraper 37, and flexible brushes 12 are fixedly connected in the pin holes. The length of the flexible brushes 12 is greater than the distance between the double - crank punching machine 3 and the punching table 5. A plurality of counterweight balls 13 are evenly fixedly connected to the outer wall of the installation sleeve 11. A U - shaped grip 38 is fixedly connected to the outer wall of the installation sleeve 11. The U - shaped grip 38 is located at the middle position of the installation sleeve 11. A limiting mechanism for limiting the U - shaped rod 10 is installed on the first frame 1. A blowing - cleaning mechanism is fixedly connected to the second frame 2;

[0034] The blowing - cleaning mechanism includes a booster fan 41 fixedly connected to the second frame 2. An air inlet pipe 42 is fixedly communicated with the air inlet of the booster fan 41. An air outlet pipe 43 is fixedly communicated with the air outlet of the booster fan 41. A shunt pipe 44 is fixedly communicated with the air outlet pipe 43. A plurality of jet nozzles 45 are fixedly communicated with the shunt pipe 44. The jet ports of the plurality of jet nozzles 45 are flush with the upper side of the punching table 5;

[0035] During use, the provided booster fan 41 sucks air through the air inlet pipe 42 and pressurizes it. The air enters the shunt pipe 44 through the air outlet pipe 43. The pressurized air flow in the shunt pipe 44 is ejected through the plurality of jet nozzles 45 to clean the surface of the punching table 5, thereby being able to improve the cleaning effect.

[0036] In the above embodiments, when cleaning the stamping waste chips, the limit mechanism releases the limit on the U-shaped rod 10. Under the action of gravity, the U-shaped rod 10 rotates around the rotating shaft 9. The U-shaped rod 10 drives the cleaning scraper 37 and multiple flexible brushes 12 to rotate. When the cleaning scraper 37 and the flexible brushes 12 rotate above the stamping table 5, the cleaning scraper 37 and the multiple flexible brushes 12 can clean the stamping waste chips on the stamping table 5. The multiple counterweight balls 13 provided can make the center of gravity of the U-shaped rod 10 biased downward. When the U-shaped rod 10 moves to the highest point, it will fall back under the action of gravity, so that the cleaning scraper 37 and the flexible brushes 12 can swing reciprocally around the rotating shaft 9. And the compression spring 40 provided can increase the swinging frequency of the U-shaped rod 10, so as to quickly and effectively clean the stamping table 5. The booster fan 41 provided sucks and pressurizes air through the air inlet pipe 42, and the gas enters the shunt pipe 44 through the air outlet pipe 43. The pressurized air flow in the shunt pipe 44 is ejected through multiple air jets 45 to clean the surface of the stamping table 5, so as to improve the cleaning effect. After the cleaning is completed, pull the U-shaped rod 10 upward to make the limit mechanism limit the U-shaped rod 10. The U-shaped rod 10 will not affect the normal stamping of the punching machine, and there is no need for the operator to stay under the double-crank punching machine 3 for cleaning operations, which effectively improves the convenience of cleaning the closed-door type double-crank precision steel frame punching machine, effectively reduces the labor intensity of the operator, and can improve the use safety of the closed-door type double-crank precision steel frame punching machine.

[0037] The limit mechanism includes a sliding hole 22 opened on the first frame 1. A limit rod 23 is movably inserted into the sliding hole 22. Both ends of the limit rod 23 extend out of the sliding hole 22. A U-shaped plate 24 is fixedly connected to the vertical side wall of the first frame 1. A jack 25 is opened on the U-shaped plate 24. The limit rod 23 passes through the U-shaped plate 24 through the jack 25. A retaining ring 26 is fixedly sleeved on the rod wall of the limit rod 23. A spring 27 is fixedly connected between the retaining ring 26 and the U-shaped plate 24. The spring 27 is movably sleeved on the limit rod 23. One end of the limit rod 23 is fixedly connected to a pull rod 28.

[0038] In the above embodiments, pull the pull rod 28, and the pull rod 28 drives the limit rod 23 to move, so that the limit rod 23 contracts into the sliding hole 22, thereby releasing the limit of the limit rod 23 on the U-shaped rod 10. The U-shaped rod 10 falls and swings under the action of gravity. After the cleaning is completed, pull the U-shaped rod 10 to make the U-shaped rod 10 move above the limit rod 23, and release the limit rod 23. The spring 27 drives the retaining ring 26 to reset, and the retaining ring 26 drives the limit rod 23 to reset, so that the limit rod 23 can be stuck under the U-shaped rod 10 to prevent the U-shaped rod 10 from falling and interfering with the stamping of the punching machine.

[0039] The noise reduction component includes a spray pipe 14 fixedly connected to the first frame 1. A plurality of nozzles 15 are evenly and fixedly communicated with one side of the spray pipe 14 close to the stamping table 5. A booster water pump 16 is fixedly connected to the first frame 1. A water guide pipe 17 is fixedly communicated between the water outlet of the booster water pump 16 and the spray pipe 14. The water inlet of the booster water pump 16 is fixedly communicated with a water inlet pipe 18.

[0040] In the above embodiment, during use, the water inlet pipe 18 is connected to water, and the booster water pump 16 is started. The booster water pump 16 transports water into the spray pipe 14 through the water inlet pipe 18 and the water guide pipe 17. The water in the spray pipe 14 is ejected through a plurality of nozzles 15, so that the water can be sprayed onto the stamping table 5, and a water film can be formed on the stamping table 5. When the plate to be stamped is placed on the stamping table 5 for stamping, the water film will fill the gap between the plate and the stamping table 5, thereby avoiding the problem of sonic boom caused by the presence of air between the plate and the stamping table 5 during stamping, and effectively reducing the noise during the operation of the closed-door type double-crank precision steel frame punching machine.

[0041] Two threaded holes 19 are symmetrically opened on the upper sides of the first frame 1 and the second frame 2. A stud 20 is threadedly sleeved in the threaded hole 19. The upper end of the stud 20 extends out of the threaded hole 19 and is fixedly connected with a lifting ring 21.

[0042] In this embodiment, during use, the plurality of provided lifting rings 21 can facilitate the connection with the hoisting equipment, improve the convenience of hoisting the closed-door type double-crank precision steel frame punching machine, thereby improving the convenience of handling the closed-door type double-crank precision steel frame punching machine. And by rotating the stud 20, the opening direction and height of the lifting ring 21 can be adjusted according to the actual hoisting requirements, effectively improving the flexibility of hoisting.

[0043] The outer wall of the mounting sleeve 11 is fixedly connected with a U-shaped grip 38. The U-shaped grip 38 is located in the middle of the mounting sleeve 11, which can improve the convenience of operating the U-shaped rod 10.

[0044] The lower sides of the first frame 1 and the second frame 2 are both fixedly connected with a base 29. A groove 30 is opened on the base 29. The provided base 29 and groove 30 can improve the adaptability of the closed-door type double-crank precision steel frame punching machine to different ground surfaces, thereby improving the stability of placing the closed-door type double-crank precision steel frame punching machine.

[0045] A U-shaped plate 24 is fixedly connected with an L-shaped clamping plate 31. A clamping groove 32 corresponding to the pull rod 28 is formed in the L-shaped clamping plate 31. During use, the pull rod 28 is rotated to align the pull rod 28 with the clamping groove 32. Then the pull rod 28 is released. Under the action of the spring 27, the pull rod 28 is clamped into the clamping groove 32, so that the limiting rod 23 can be limited, preventing the limiting rod 23 from affecting the swing of the U-shaped rod 10.

[0046] The water guide pipe 17 includes a first water pipe 33 fixedly communicated with the spray pipe 14. The water outlet of the booster water pump 16 is fixedly communicated with a second water pipe 34. A water stop valve 35 is fixedly communicated between the first water pipe 33 and the second water pipe 34. The provided water stop valve 35 can control the water inlet, improving the flexibility of use.

[0047] The same support plate 36 is fixedly connected between the two bases 29. The side wall on the upper side of the support plate 36 is closely attached to the side wall on the lower side of the support seat 4. The provided support plate 36 can support the support seat 4, improving the impact resistance of the support seat 4 and the impact resistance of the stamping table 5.

[0048] Working principle: When cleaning the stamping waste chips, the pull rod 28 is pulled. The pull rod 28 drives the limiting rod 23 to move, so that the limiting rod 23 contracts into the sliding hole 22, thus releasing the limit of the limiting rod 23 on the U-shaped rod 10. The U-shaped rod 10 rotates around the rotating shaft 9 under the action of gravity. The U-shaped rod 10 drives the cleaning scraper 37 and multiple flexible brushes 12 to rotate. When the cleaning scraper 37 and the flexible brushes 12 rotate above the stamping table 5, the cleaning scraper 37 and the multiple flexible brushes 12 can clean the stamping waste chips on the stamping table 5. The provided multiple counterweight balls 13 can make the center of gravity of the U-shaped rod 10 biased downward. When the U-shaped rod 10 moves to the highest point, it will fall back under the action of gravity, so that the cleaning scraper 37 and the flexible brushes 12 can swing reciprocally around the rotating shaft 9, thus being able to clean the stamping table 5 quickly and effectively. The provided booster fan 41 sucks air and pressurizes it through the air inlet pipe 42. The gas enters the shunt pipe 44 through the air outlet pipe 43. The pressurized air flow in the shunt pipe 44 is sprayed out through multiple air jet heads 45 to clean the surface of the stamping table 5, so as to improve the cleaning effect. After cleaning, the U-shaped rod 10 is pulled to move the U-shaped rod 10 above the limiting rod 23. The limiting rod 23 is released. The spring 27 drives the retaining ring 26 to reset, and the retaining ring 26 drives the limiting rod 23 to reset, so that the limiting rod 23 can be stuck under the U-shaped rod 10, preventing the U-shaped rod 10 from falling and interfering with the stamping of the punching press. There is no need for the operator to stay with his hand under the double-crank punching machine 3 for cleaning operation, effectively improving the convenience of cleaning the closed gantry double-crank precision steel frame punching press, effectively reducing the labor intensity of the operator, and being able to improve the use safety of the closed gantry double-crank precision steel frame punching press.

[0049] It should be noted that, in this document, 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 terms "comprising", "including" or any other variant thereof are intended to cover non-exclusive inclusion, such that a process, method, article or device comprising a series of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article or device.

[0050] Although the embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A closed door type double crank precision steel frame punch press, comprising a first frame (1) and a second frame (2), characterized in that: A double crankshaft punching machine (3) is fixedly connected between the first frame (1) and the second frame (2); a support base (4) is fixedly connected between the first frame (1) and the second frame (2); a punching table (5) is fixedly connected to the upper side of the support base (4); a control box (6) is connected to the double crankshaft punching machine (3); a cleaning mechanism is fixedly connected to the vertical side wall of the double crankshaft punching machine (3); and a noise reduction component is connected to the first frame (1); The cleaning mechanism comprises two fixed plates (7) symmetrically fixedly connected to the vertical side walls of the double crankshaft punching machine (3), the two fixed plates (7) are fixedly connected with a fixed cylinder (8), the two fixed cylinders (8) are rotatably connected with a rotating shaft (9) through a bearing, and the same U-shaped rod (10) is fixedly connected between the two rotating shafts (9), the double crankshaft punching machine (3) is symmetrically fixedly connected with two mounting plates (39), the two mounting plates (39) are fixedly connected with a compression spring (40) corresponding to the U-shaped rod (10), the compression spring (40) is located on the upper side of the U-shaped rod (10), and the horizontal rod wall of the U-shaped rod (10) is fixedly sleeved with a mounting sleeve (11), and the outer wall of the mounting sleeve (11) is fixedly connected with a cleaning scraper (37).

2. A closed door type double crank precision steel frame punch press according to claim 1, characterized in that: The cleaning scraper (37) is evenly provided with a plurality of pin holes, and a flexible brush (12) is fixedly connected in the pin hole, the length of the flexible brush (12) is greater than the distance between the double crankshaft punching machine (3) and the punching table (5), the outer wall of the mounting sleeve (11) is evenly fixedly connected with a plurality of weight balls (13), the outer wall of the mounting sleeve (11) is fixedly connected with a U-shaped handle (38), the U-shaped handle (38) is located in the middle position of the mounting sleeve (11), and a limiting device for limiting the position of the U-shaped rod (10) is installed on the first frame (1). The second frame (2) is fixedly connected to a blowing and cleaning mechanism, the blowing and cleaning mechanism comprises a booster fan (41) fixedly connected to the second frame (2), the air inlet of the booster fan (41) is fixedly connected to an air inlet pipe (42), the air outlet of the booster fan (41) is fixedly connected to an air outlet pipe (43), the air outlet pipe (43) is fixedly connected to a shunt pipe (44), the shunt pipe (44) is fixedly connected to a plurality of nozzles (45), and the nozzles of the plurality of nozzles (45) are flush with the upper side of the punching table (5); The noise reduction component comprises a spray pipe (14) fixedly connected to the first frame (1); a plurality of spray heads (15) are evenly and fixedly connected to one side of the spray pipe (14) close to the punching table (5); a booster water pump (16) is fixedly connected to the first frame (1); a water guide pipe (17) is fixedly connected between the water outlet of the booster water pump (16) and the spray pipe (14); and a water inlet of the booster water pump (16) is fixedly connected to a water inlet pipe (18).

3. A closed door type double crank precision steel frame punch press according to claim 2, characterized in that: Two threaded holes (19) are symmetrically provided on the upper sides of the first frame (1) and the second frame (2); a stud (20) is threadedly sleeved in the threaded hole (19); the upper end of the stud (20) protrudes out of the threaded hole (19) and is fixedly connected to a lifting ring (21).

4. A closed door type double crank precision steel frame punch press according to claim 3, characterized in that: The limiting mechanism comprises a sliding hole (22) formed on the first frame (1), a limiting rod (23) being movably inserted into the sliding hole (22), and both ends of the limiting rod (23) extending out of the sliding hole (22).

5. A closed door type double crank precision steel frame punch press according to claim 4, characterized in that: The lower sides of the first frame (1) and the second frame (2) are both fixedly connected with a base (29), and a groove (30) is provided on the base (29).

6. A closed door type double crank precision steel frame punch press according to claim 5, characterized in that: An L-shaped clamping plate (31) is fixedly connected to the U-shaped plate (24), and a clamping groove (32) corresponding to the pull rod (28) is provided on the L-shaped clamping plate (31).

7. A closed door type double crank precision steel frame punch press according to claim 2, characterized in that: The water guide pipe (17) comprises a first water pipe (33) fixedly connected to the spray pipe (14); the water outlet of the booster water pump (16) is fixedly connected to a second water pipe (34); and a water stop valve (35) is fixedly connected between the first water pipe (33) and the second water pipe (34).

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