Mould locking mechanism for hydraulic machine
By designing a hydraulic press mold locking mechanism including a cross rotating arm and a return spring, the existing hydraulic press mold locking mechanism is solved and the problem of damage to the limit plate and insufficient safety when the hydraulic system is leaked, achieving higher safety and lower damage rate.
Patent Information
- Application Number
- CN202311382803.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2023-10-24
- Publication Date
- 2025-05-06
AI Technical Summary
When the hydraulic system leaks, the mold locking mechanism of the existing hydraulic press cannot accurately control the upward movement distance of the upper mold seat, which can easily lead to damage to the limit plate and insufficient safety.
A mold locking mechanism including a base plate, a tie rod, an opening and closing mechanism and a driving device is designed. The opening and closing mechanism consists of a cross-set rotating arm, an elastic member and a cylinder drive device. Through the inclination design of the rotating arm and the reset function of the elastic member, the limit ring can be safely passed and locked.
It improves the safety of the hydraulic press, reduces the damage rate of the mold locking mechanism, ensures the stable operation of the hydraulic system, and is suitable for large-tonnage hydraulic presses.
Smart Images
Figure CN119928339A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the field of industrial manufacturing, and more particularly to a mold locking mechanism used on a hydraulic press. Background Art
[0002] Please refer to Figure 7-10 As shown, the hydraulic press of the prior art comprises an upper fixed plate 9, an upper die seat 91 and a clamping mechanism, wherein the clamping mechanism comprises a cylinder 92 fixed on the top surface of the upper fixed plate 9, a limit plate 93 is provided at a driving end 921 of the cylinder 92, a U-shaped groove 94 is provided at one end of the limit plate 93 away from the cylinder 92, a through hole 90 is provided on the upper fixed plate 9, a pull rod 95 passes through the through hole 90 and is fixed on the top surface of the upper die seat 91, the pull rod 95 comprises a rod portion 96, and a plurality of limit rings 97 arranged at intervals are sleeved on the rod portion 96; Please refer to Figure 8-9 As shown, the limit plate can be moved to change its position to the first position or the second position. When the upper die holder 91 rises to the desired position height, the cylinder 92 drives the limit plate 93 to move forward, so that the rod 96 enters the U-shaped groove 94, as shown in FIG. Fig. 9 , there is at least one limiting ring 97 above the limiting plate 93. At this time, the limiting plate 93 is in the first position. If there is a leak in the hydraulic system of the hydraulic press, the upper die seat 91 will crawl or fall. Since the limiting ring 97 above the limiting plate 93 cannot move down through the U-shaped groove 94, the upper die seat 91 will not fall to the bottom and cause a safety accident; the cylinder 92 drives the limiting plate 93 to move backward, so that the rod 96 exits the U-shaped groove 94, such as Figure 8 At this time, the limiting plate 93 is in the second position, and the upper die seat 91 can reciprocate up and down.
[0003] The hydraulic press of the prior art has the following problems: when the limit plate 93 is in the first position, if the upper die seat 91 creeps or falls, it will drive the pull rod 95 to move downward, and a limit ring 97 will be pressed on the limit plate 93. At this time, the limit plate 93 cannot be switched to the second position. Therefore, it is necessary to drive the upper die seat 91 to drive the pull rod 95 to move upward so that the limit ring 97 that presses the limit plate 93 is separated from the limit plate 93, and the cylinder 92 can drive the limit plate 93 to switch to the second position. When the upper die seat 91 is manually controlled to move upward by a button switch, the upward movement distance of the upper die seat 91 cannot be accurately controlled. If the upward movement distance of the upper die seat 91 is too large, the limit ring 97 under the limit plate 93 will move up and hit the limit plate 93, causing damage to the limit plate 93. Summary of the invention
[0004] The technical problem to be solved by the present invention is to provide a clamping mechanism for a hydraulic press. The hydraulic press using the clamping mechanism of the present invention has good safety and a low damage rate of the clamping mechanism.
[0005] In order to solve the above technical problems, the present invention relates to a locking mechanism for a hydraulic press, the locking mechanism comprising: a locking mechanism for a hydraulic press, characterized in that: it comprises a bottom plate, a pull rod is passed through the bottom plate, the pull rod comprises a rod portion, a plurality of spaced limit rings are sleeved on the rod portion, the upper side surface of the limit ring is a truncated cone side surface, an opening and closing mechanism and a driving device are arranged on the bottom plate, the opening and closing mechanism comprises a pair of rotating arms located above the bottom plate and cross-arranged, the front sections of the pair of rotating arms are respectively located on both sides of the pull rod, at least one elastic member is arranged between the pair of rotating arms, the opening and closing mechanism is in a locked state, the elastic member makes the front sections of the pair of rotating arms close to each other, and the limit ring of the pull rod cannot pass through the clamping state gap between the front sections of the pair of rotating arms in the clamping state; the driving device drives the pair of rotating arms to rotate, so that the opening and closing mechanism switches to an open state, and the limit ring of the pull rod can pass through the separation state gap between the front sections of the pair of rotating arms in the separation state.
[0006] Furthermore, a through hole is provided on the bottom plate, the pull rod is passed through the through hole, a virtual longitudinal axis is set with the center point of the through hole as the reference point, and the diameter of the rod part included in the pull rod and the diameter of the limiting ring are both smaller than the aperture of the through hole.
[0007] Furthermore, the elastic member is a return spring, which enables the opening and closing mechanism to always have a tendency to change from an open state to a locked state.
[0008] Furthermore, the driving device is arranged on the base plate and is located on the rear side of the opening and closing mechanism. A fixed plate is arranged on the front side of the driving end of the driving device, and at least one guide rail is arranged on the base plate. The fixed plate is slidably arranged on the guide rail through a slider. Fixed rods are vertically arranged on the left and right sides of the fixed plate, respectively, and a first bearing is sleeved on the fixed rod; the driving device is a cylinder, and the driving end of the driving device pushes the fixed plate so that the first bearing on the fixed plate contacts and pushes the inner side surface of the rear end of the pair of rotating arms to drive the pair of rotating arms to rotate, and there is rolling friction between the first bearing and the pair of rotating arms.
[0009] Furthermore, a fixed shaft is provided on the bottom plate between the driving device and the through hole, the pair of rotating arms are pivotally connected to the fixed shaft, a second bearing is provided between each rotating arm and the fixed shaft, grooves are respectively provided on the opposite surfaces of the pair of rotating arms, the pair of rotating arms are engaged with each other through the grooves, and a set of thrust ball bearings is provided between the pair of rotating arms and is arranged on the outside of the fixed shaft.
[0010] Furthermore, the bottom surface of the limiting ring of the pull rod is a plane, and the cross-sectional diameter of the limiting ring gradually decreases from the bottom surface of the limiting ring upwards.
[0011] Furthermore, the front sections of the pair of rotating arms each include an inclined arm. When the pair of inclined arms contact each other with the bottom surface of the limit ring, due to the inclined design of the inclined arms, the contact area between the two is larger, so that the load-bearing capacity of the pull rod is stronger; in the initial state, the elastic member arranged between the rear ends of the pair of rotating arms makes the inclined arms of the front sections of the pair of rotating arms close to each other, and the pair of inclined arms are parallel to each other.
[0012] Furthermore, the rear ends of the pair of rotating arms are respectively provided with a guide rod extending downward toward the bottom plate, and the ends of the guide rods are sleeved with at least one third bearing, and the third bearing is cooperatedly arranged in the arc-shaped hole provided in the bottom plate.
[0013] Furthermore, a clamping state gap generated by the pair of inclined arms in the clamping state on the virtual longitudinal axis is smaller than the diameter of the limiting ring of the pull rod, and at the same time, the clamping state gap is equal to the diameter of the rod portion of the pull rod, while a separation state gap generated by the pair of inclined arms in the separated state on the virtual longitudinal axis is larger than the diameter of the limiting ring of the pull rod, and at the same time, the separation state gap generated by the pair of inclined arms in the separated state on the virtual longitudinal axis is larger than the aperture of the through hole of the bottom plate.
[0014] Furthermore, the bottom plate of the clamping mechanism is fixed above the upper fixed plate of the hydraulic press. A through hole is provided on the upper fixed plate of the hydraulic press. The bottom of the pull rod passes through the through hole and is fixed on the upper die base of the hydraulic press. The upper die base of the hydraulic press can simultaneously drive the pull rod to reciprocate up and down.
[0015] After adopting the above scheme, the hydraulic press using the clamping mechanism of the present invention has good safety and the damage rate of the clamping mechanism is low; And the number of the limit rings is multiple, so that the clamping mechanism has multiple locking positions and has wider adaptability; And because the upper side surface of the limit ring is a truncated cone side surface, during the collision between one of the limit rings and the pair of rotating arms, the inclined arms of the pair of rotating arms will slide over the upper side surface of the limit ring and then separate. Therefore, after the inclined arms of the pair of rotating arms are collided with the limit ring, the pair of rotating arms will not be damaged due to the collision.
[0016] Furthermore, since there is rolling friction between the first bearing and the rotating arm, the rotating arm has less wear and a longer service life; and the driving device is a cylinder, which is a standard part and has a lower cost.
[0017] Furthermore, since the pair of rotating arms are engaged with each other through grooves, a set of thrust ball bearings arranged on the outside of the fixed shaft is provided between the pair of rotating arms, and since the rear ends of the pair of rotating arms are respectively provided with a guide rod extending downward toward the base plate, the end of the guide rod is sleeved with at least one third bearing, and the third bearing is cooperatedly arranged in the arc hole provided in the base plate, so that the rotating arm can rotate flexibly and with high movement accuracy.
[0018] Furthermore, when the upper die seat of the hydraulic press rises to the required position height, the opening and closing mechanism switches to a locking state. There is at least one limit ring above the opening and closing mechanism. At this time, if a leak occurs in the hydraulic system of the hydraulic press, causing the upper die seat of the hydraulic press to fall downward, the bottom surface of the limit ring located above the opening and closing mechanism will contact and press on the inclined arms of the aforementioned pair of rotating arms, that is, the limit ring above the opening and closing mechanism cannot pass through the clamping state gap between the inclined arms of the pair of rotating arms in the clamping state, so the upper die seat of the hydraulic press will not fall straight to the bottom and cause a safety accident. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] Figure 1 A three-dimensional diagram of the locking state of the mold locking mechanism of the present invention; Figure 2 A three-dimensional diagram of the mold locking mechanism of the present invention in an open state; Figure 3 An exploded view of the clamping mechanism of the present invention; Figure 4 for Figure 1 A top view of Figure 5 for Figure 2 A top view of Figure 6 For application Figure 1 Schematic diagram of the hydraulic press with clamping mechanism; Figure 7 It is a schematic diagram of a clamping mechanism of the prior art; Figure 8 is a schematic diagram of the limiting plate being in the second position; Fig. 9 is a schematic diagram of the limiting plate being in the first position; Fig.10 A schematic diagram of a hydraulic press according to the prior art.
[0020] Description of Figure Numbers: The present invention includes: 1 a bottom plate; 10 a through hole; 11 a fixed shaft; 12 an arc-shaped hole; 2 a pull rod; 21 a rod portion; 22 a limiting ring; 221 an upper side surface; 222 a bottom surface; 30 an opening and closing mechanism; 3 a rotating arm; 31 an inner side surface; 32 a groove; 33 a second bearing; 34 a thrust ball bearing; 35 a tilting arm; 36 a guide rod; 37 a third bearing; 4 an elastic member; 5 a driving device; 50 a driving end; 6 a fixing plate; 61 a fixing rod; 62 a first bearing; 7 a guide rail; 71 a slider; 8 a hydraulic press; 80 a through hole; 81 an upper fixing plate; 82 an upper die seat; C a center point; V a virtual longitudinal axis line; A a diameter of the rod portion; B a diameter of the limiting ring; Q a hole diameter; M a clamping state gap; N a separation state gap.
[0021] Prior art: 9 upper fixing plate; 90 through hole; 91 upper die base; 92 cylinder; 921 driving end; 93 limiting plate; 94 U-shaped groove; 95 pull rod; 96 rod portion; 97 limiting ring. DETAILED DESCRIPTION
[0022] See also Figure 1-5 As shown, the present invention relates to a clamping mechanism for a hydraulic press 8, the clamping mechanism comprises a base plate 1, the base plate 1 is provided with a through hole 10, a pull rod 2 is passed through the through hole 10, the pull rod 2 comprises a rod portion 21, a plurality of spaced limit rings 22 are sleeved on the rod portion 21, an opening and closing mechanism 30 and a driving device 5 are provided on the base plate 1, the opening and closing mechanism 30 comprises a pair of rotating arms 3 which are located above the base plate 1 and are cross-arranged, the front sections of the pair of rotating arms 3 are respectively located on both sides of the pull rod 2, at least one elastic member 4 is provided between the rear ends of the pair of rotating arms 3, the elastic member 4 is a reset spring, the elastic member 4 enables the opening and closing mechanism 30 to always have a tendency to change from an open state to a locked state, and in the initial state, the opening and closing mechanism 30 is in a locked state; the elastic member 4 can also be a rubber band.
[0023] according to Figure 4 and Figure 5 As shown in the viewing direction, the through hole 10 of the bottom plate 1 is set as a circular hole, with the center point C of the through hole 10 as the reference point and a virtual longitudinal axis V set, the diameter A of the rod portion 21 included in the pull rod 2 and the diameter B of the stop ring 22 are both smaller than the aperture Q of the through hole 10, that is, A <Q,B<Q。
[0024] The driving device 5 is disposed on the aforementioned bottom plate 1 and is located at the rear side of the opening and closing mechanism 30. A fixing plate 6 is disposed in front of the driving end 50 of the driving device 5. At least one guide rail 7 is disposed on the aforementioned bottom plate 1. The fixing plate 6 is slidably arranged on the guide rail 7 through a slider 71. The left and right sides of the fixing plate 6 are respectively vertically provided with fixing rods 61. The fixing rods 61 are sleeved with first bearings 62. The driving device 5 is a cylinder, and the driving end 50 of the driving device 5 pushes the aforementioned fixed plate 6 so that the first bearing 62 on the fixed plate 6 contacts and pushes the inner side surface 31 of the rear end of the aforementioned rotating arm 3 to drive the rotating arm 3 to rotate. Since there is rolling friction between the first bearing 62 and the rotating arm 3, the wear of the rotating arm 3 is small and the service life is long; the driving device 5 can also be a screw-nut mechanism, which drives the rotating arm 3 to rotate by pushing the inner side surface 31 of the rear end of the rotating arm 3 through the screw. The driving device 5 can also be a crank slider mechanism, a hydraulic cylinder, a cam mechanism, etc.; the preferred driving device 5 in this embodiment is a cylinder, which is a standard part and has lower cost.
[0025] A fixed shaft 11 is provided on the bottom plate 1 located between the aforementioned driving device 5 and the through hole 10, and the aforementioned pair of rotating arms 3 is sleeved and pivoted on the fixed shaft 11. A second bearing 33 is provided between each rotating arm 3 and the fixed shaft 11. Grooves 32 are respectively provided on the opposite surfaces of the pair of rotating arms 3. The pair of rotating arms 3 are fitted with each other through the grooves 32. A set of thrust ball bearings 34 arranged on the outside of the fixed shaft 11 is provided between the pair of rotating arms 3. The rotating arms 3 are flexible in rotation and have high movement accuracy.
[0026] See also Figure 6 As shown, the upper side surface 221 of the limit ring 22 of the aforementioned pull rod 2 is a truncated cone side surface, and the bottom surface 222 of the limit ring 22 is a plane, that is, the cross-sectional diameter of the limit ring 22 gradually decreases from the bottom surface 222 of the limit ring 22 upwards. The number of the limit rings 22 is multiple, so that the clamping mechanism has multiple locking positions and wider adaptability.
[0027] The front section of the aforementioned rotating arm 3 includes an inclined arm 35. When the inclined arm 35 contacts the bottom surface 222 of the aforementioned limiting ring 22, due to the inclined design of the inclined arm 35, the contact area between the two is larger, so that the bearing capacity of the aforementioned pull rod 2 is stronger. In the initial state, the elastic member 4 arranged between the rear ends of the pair of rotating arms 3 can make the inclined arms 35 of the front section of the pair of rotating arms 3 close to each other, and the pair of inclined arms 35 are parallel to each other; the rear ends of the aforementioned rotating arms 3 are respectively provided with a guide rod 36 extending downward toward the aforementioned bottom plate 1, and the end of the guide rod 36 is sleeved with at least one third bearing 37, and the third bearing 37 is arranged in the arc hole 12 provided in the aforementioned bottom plate 1, so that the movement accuracy of the rotating arm 3 is high.
[0028] The opening and closing mechanism 30 includes a locking state and an opening state. In the initial state, Figure 1 and Figure 4As shown, the opening and closing mechanism 30 is in a locked state. The elastic member 4 causes the inclined arms 35 at the front section of the pair of rotating arms 3 to approach each other. The clamping state gap M generated by the pair of inclined arms 35 in the clamping state on the virtual longitudinal axis V is smaller than the diameter B of the limiting ring 22 of the pull rod 2, and at the same time, the clamping state gap M is equal to the diameter A of the rod portion 21 of the pull rod 2, that is, M < B, M = A. The limiting ring 22 of the pull rod 2 cannot pass through the clamping state gap M between the inclined arms 35 of the pair of rotating arms 3 in the clamping state; Please refer to Figure 2 and Figure 5 As shown, the driving end 50 of the driving device 5 drives the rotating arm 3 to rotate by pushing the fixing plate 6, so that the first bearing 62 on the fixing plate 6 abuts against and pushes the inner side surface 31 at the rear end of the rotating arm 3, switching the opening and closing mechanism 30 to the open state. The inclined arms 35 at the front section of the pair of rotating arms 3 are separated from each other. The separation state gap N generated by the pair of inclined arms 35 in the separation state on the virtual longitudinal axis V is larger than the diameter B of the limiting ring 22 of the pull rod 2, that is, N > B, and at the same time, the separation state gap N generated by the pair of inclined arms 35 in the separation state on the virtual longitudinal axis V is larger than the aperture Q of the through hole 10 of the bottom plate 1, N > Q. The limiting ring 22 of the pull rod 2 can pass through the separation state gap N between the inclined arms 35 of the pair of rotating arms 3 in the separation state.
[0029] Please refer to Figure 6As shown, the clamping mechanism of the present invention is installed on a hydraulic press 8, the bottom plate 1 of the clamping mechanism is fixed above the upper fixed plate 81 of the hydraulic press 8, and the bottom end of the tie rod 2 of the clamping mechanism is fixed above the upper die seat 82 of the hydraulic press 8. The upper die seat 82 of the hydraulic press 8 can simultaneously drive the tie rod 2 to reciprocate up and down. When the aforementioned opening and closing mechanism 30 is in a locked state, the upper die seat 82 of the hydraulic press 8 falls downward and simultaneously drives the tie rod 2 to move downward. At this time, the bottom surface 222 of one of the limit rings 22 will contact and press the aforementioned pair of rotating arms 3, so that the aforementioned driving device 5 cannot drive the opening and closing mechanism 30 to switch to the open state by the driving end 50. At this time, it is necessary to drive the upper die seat 82 of the hydraulic press 8 to drive the tie rod 2 to move upward, so that the limit ring 22 contacting the pair of rotating arms 3 is aligned with the rotating arms 3. Only when the upper die base 82 of the hydraulic press 8 is controlled to move upward by the push button switch manually, the upward movement distance of the upper die base 82 is not easy to control. If the upward movement distance of the upper die base 82 is too large, one of the limit rings 22 located below the pair of rotating arms 3 will hit the pair of rotating arms 3 during the upward movement. Since the upper side surface 221 of the limit ring 22 is a truncated cone side surface, during the collision between one of the limit rings 22 and the pair of rotating arms 3, the inclined arms 35 of the pair of rotating arms 3 will slide from the upper side surface 221 of the limit ring 22 and separate again. Therefore, after the inclined arms 35 of the pair of rotating arms 3 are hit by the limit ring 22, the pair of rotating arms 3 will not be damaged due to the collision.
[0030] The upper fixing plate 81 of the hydraulic press 8 has a through hole 80, and the bottom of the pull rod 2 passes through the through hole 80 and is fixed on the upper die base 82 of the hydraulic press 8; When the hydraulic press 8 is in use, the opening and closing mechanism 30 is first driven to switch to the open state through the driving end 50 of the driving device 5. At this time, the upper die seat 82 of the hydraulic press 8 can drive the pull rod 2 to reciprocate up and down. When the upper die seat 82 of the hydraulic press 8 rises to the required position height, the opening and closing mechanism 30 is switched to the locked state. There is at least one limit ring 22 above the opening and closing mechanism 30. At this time, if the hydraulic system of the hydraulic press 8 leaks and causes the upper die seat 82 of the hydraulic press 8 to fall downward, the bottom surface 222 of the limit ring 22 located above the opening and closing mechanism 30 will resist and press on the inclined arms 35 of the pair of rotating arms 3 mentioned above, that is, the limit ring 22 above the opening and closing mechanism 30 cannot pass through the clamping state gap M between the inclined arms 35 of the pair of rotating arms 3 in the clamping state, as shown in FIG. Figure 4 As shown, the upper mold base 82 of the hydraulic press 8 will not fall straight to the bottom and cause a safety accident. The pull rod 2 has a high tensile strength, so the clamping mechanism can withstand a large load and is suitable for use with a large-tonnage hydraulic press 8. The hydraulic press 8 using the clamping mechanism of this embodiment has good safety, and the damage rate of the clamping mechanism is low.
Claims
1. A clamping mechanism for a hydraulic press, characterized in that: It includes a base plate, on which a pull rod is passed, and the pull rod includes a rod portion, on which a plurality of spaced limiting rings are sleeved, and the upper side surface of the limiting ring is a truncated cone side surface, and the base plate is provided with an opening and closing mechanism and a driving device, the opening and closing mechanism includes a pair of rotating arms that are located above the base plate and cross-arranged, the front sections of the pair of rotating arms are respectively located on both sides of the pull rod, and at least one elastic member is provided between the pair of rotating arms, and the opening and closing mechanism is in a locked state, and the elastic member brings the front sections of the pair of rotating arms closer to each other, and the limiting ring of the pull rod cannot pass through the clamping state gap between the front sections of the pair of rotating arms in the clamping state; the driving device drives the pair of rotating arms to rotate, so that the opening and closing mechanism switches to an open state, and the limiting ring of the pull rod can pass through the separation state gap between the front sections of the pair of rotating arms in the separation state.
2. The clamping mechanism for a hydraulic press according to claim 1, characterized in that: The bottom plate is provided with a through hole, the pull rod is passed through the through hole, a virtual longitudinal axis is set with the center point of the through hole as the reference point, and the diameter of the rod part included in the pull rod and the diameter of the limiting ring are both smaller than the aperture of the through hole.
3. The clamping mechanism for a hydraulic press according to claim 1, characterized in that: The elastic member is a return spring, which enables the opening and closing mechanism to always have a tendency to change from an open state to a locked state.
4. The clamping mechanism for a hydraulic press according to claim 1, characterized in that: The driving device is arranged on the base plate and is located at the rear side of the opening and closing mechanism. A fixed plate is arranged in front of the driving end of the driving device, and at least one guide rail is arranged on the base plate. The fixed plate is slidably arranged on the guide rail through a slider. Fixed rods are vertically arranged on the left and right sides of the fixed plate, and a first bearing is sleeved on the fixed rod. The driving device is a cylinder. The driving end of the driving device pushes the fixed plate so that the first bearing on the fixed plate contacts and pushes the inner side surface of the rear end of the pair of rotating arms to drive the pair of rotating arms to rotate. There is rolling friction between the first bearing and the pair of rotating arms.
5. The clamping mechanism for a hydraulic press according to claim 2, characterized in that: A fixed shaft is provided on the bottom plate between the driving device and the through hole, the pair of rotating arms are pivotally connected to the fixed shaft, a second bearing is provided between each rotating arm and the fixed shaft, grooves are respectively provided on the opposite surfaces of the pair of rotating arms, the pair of rotating arms are fitted into each other through the grooves, and a set of thrust ball bearings is provided between the pair of rotating arms and arranged on the outside of the fixed shaft.
6. The clamping mechanism for a hydraulic press according to claim 1, characterized in that: The bottom surface of the limiting ring of the pull rod is a plane, and the cross-sectional diameter of the limiting ring gradually decreases from the bottom surface of the limiting ring upward.
7. The clamping mechanism for a hydraulic press according to claim 6, characterized in that: The front section of the pair of rotating arms respectively includes an inclined arm. When the pair of inclined arms contact with the bottom surface of the limit ring, due to the inclined design of the inclined arms, the contact area between the two is larger, so that the load-bearing capacity of the pull rod is stronger; in the initial state, the elastic member arranged between the rear ends of the pair of rotating arms makes the inclined arms of the front sections of the pair of rotating arms close to each other, and the pair of inclined arms are parallel to each other.
8. The clamping mechanism for a hydraulic press according to claim 1, characterized in that: The rear ends of the pair of rotating arms are respectively provided with a guide rod extending downward toward the bottom plate, and the ends of the guide rods are sleeved with at least one third bearing, which is matched and arranged in an arc hole provided on the bottom plate.
9. The clamping mechanism for a hydraulic press according to claim 7, characterized in that: The clamping state gap generated by the pair of inclined arms in the clamping state on the virtual longitudinal axis is smaller than the diameter of the limiting ring of the pull rod, and at the same time, the clamping state gap is equal to the diameter of the rod portion of the pull rod, while the separation state gap generated by the pair of inclined arms in the separated state on the virtual longitudinal axis is larger than the diameter of the limiting ring of the pull rod, and at the same time, the separation state gap generated by the pair of inclined arms in the separated state on the virtual longitudinal axis is larger than the aperture of the through hole of the bottom plate.
10. The clamping mechanism for a hydraulic press according to claim 1, characterized in that: The bottom plate of the clamping mechanism is fixed above the upper fixed plate of the hydraulic press. A through hole is provided on the upper fixed plate of the hydraulic press. The bottom of the pull rod passes through the through hole and is fixed on the upper die seat of the hydraulic press. The upper die seat of the hydraulic press can simultaneously drive the pull rod to reciprocate up and down.