Rack type rotary oil cylinder

Abstract

The utility model discloses a rack type rotary oil cylinder which solves the problems that an existing rotary oil cylinder is complex in structure, large in size, poor in flexibility and not easy to maintain and overhaul. According to the technical scheme, the hydraulic cylinder comprises a main oil cylinder, the main oil cylinder comprises a main cylinder body, a cylinder cover on the top face of the main cylinder body and a piston rod penetrating through the cylinder cover to be inserted into the main cylinder body, the upper end of the piston rod is connected with a T-shaped pull rod head, and the lower end of the piston rod is provided with a piston head. A gear meshed with a rack is arranged at the lower end of the guide rod, and the rack is connected with a piston rod of the auxiliary oil cylinder. The device is simple in structure, simple to operate, small in size, good in reliability and easy to overhaul and maintain.

Description

Technical Field

[0001] The utility model relates to the field of hot die forging, in particular to a rack type rotary oil cylinder used for a hot die forging press. Background Art

[0002] At present, with the increasing utilization rate of hot die forging presses in the production of mechanical products, the requirements for product production efficiency are also getting higher and higher. Since hot die forging presses need to frequently change dies during operation to achieve the purpose of producing different products, the die base of traditional hot die forging presses is connected to the die bolts and nuts. When disassembling and installing the die, it is necessary to manually disassemble and assemble the bolts, which is time-consuming, and the force of the bolts is uncontrollable when reinstalling, which can easily cause uneven force on the die, resulting in loose locking, vibration and other problems. The commonly used rotary cylinder tensioning structure uses an ordinary cylinder peripheral rotating device in order to operate flexibly in two degrees of freedom. The space occupied by the assembly is still too large, which cannot adapt to the small internal space of the die changing system inside the hot die forging press, and is difficult to maintain, and the rotation stroke limit of the cylinder cannot be adjusted. Therefore, the traditional design scheme is difficult to solve the existing problems. Summary of the invention

[0003] The purpose of the utility model is to solve the above technical problems and provide a rack type rotary cylinder for hot die forging press which has simple structure, simple operation, small size, good reliability and easy overhaul and maintenance.

[0004] The technical solution includes a master oil cylinder, which includes a main cylinder body, a cylinder cover on the top surface of the main cylinder body, and a piston rod inserted into the main cylinder body through the cylinder cover. The upper end of the piston rod is connected to a T-shaped pull rod head, and the lower end is provided with a piston head. It also includes a guide rod, the upper end of the guide rod passes through the bottom of the main cylinder body and is connected to the piston head by a key, and the lower end of the guide rod is equipped with a gear meshing with a rack, and the rack is connected to the piston rod of the auxiliary oil cylinder.

[0005] The auxiliary oil cylinder is fixed to the bottom of the main cylinder body by bolts.

[0006] A disc spring is sleeved on the piston rod of the master cylinder.

[0007] A retaining frame is provided at the lower end of the disc spring, and a steel ball in contact with the piston head is provided at the bottom of the retaining frame.

[0008] A bearing is arranged outside the lower section of the guide rod.

[0009] A bottom plate is also provided at the bottom of the main cylinder body, a guide rail is mounted on the bottom plate, and the lower end of the rack is located on the guide rail.

[0010] The two ends of the rack are fixed on the screw rod via nuts, and one end of the screw rod is connected to the piston rod of the auxiliary oil cylinder.

[0011] A set screw is arranged on the wall surface of the main cylinder body corresponding to the other end of the screw rod.

[0012] The utility model ingeniously adds a sub-cylinder on the basis of the main oil cylinder, but the piston rod of the sub-cylinder only drives the piston rod of the main oil cylinder to move through the transmission of the gear and the rack, avoiding the overall movement of the oil cylinder. Therefore, a small-sized sub-cylinder can be selected and fixed to the bottom of the main cylinder body by bolts, thereby reducing the overall volume and facilitating maintenance and replacement.

[0013] The two ends of the rack are fixed on the screw rod by nuts on both sides. Therefore, the relative position of the rack can be adjusted by changing the positions of the nuts on both sides on the screw rod, and the rotation stroke can be easily adjusted, thereby adjusting the rotation angle of the T-type tie rod head of the clamping cylinder; the rack stroke can be adjusted by rotating the set screws on the main oil cylinder, and the rotation angle range of the T-type tie rod head of the clamping cylinder can be adjusted; the bottom plate and the rack adopt a slide rail design to guide the movement direction of the rack, making the operation more stable.

[0014] The piston rod of the main cylinder body is sheathed with a disc spring to balance the weight of the lower die, reduce the required hydraulic pressure, and enable the cylinder to have a reset function when it is not filled with oil; the bottom of the retainer is provided with a steel ball in contact with the piston head, which converts the sliding friction between the disc spring and the piston head into rolling friction, reduces the friction force, and makes the rotation smoother. The guide rod and the piston head are connected by a key, which not only ensures that the piston rod can move axially, but also can be driven by the guide rod to move in the radial direction.

[0015] The utility model has the advantages of simple structure, easy operation, the oil cylinder can operate in two directions of freedom, automatically completing demoulding and locking actions, and has the advantages of small size, good reliability, and easy inspection and maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A half-section view of the present invention;

[0017] Figure 2 It is a working status diagram;

[0018] Figure 3 This is the bottom view after removing the bottom plate;

[0019] Figure 4 for Figure 3 AA partial cross-sectional view;

[0020] In the figure: 1-nut; 2-screw; 3-T-type tie rod head; 4-piston rod; 5-cylinder head; 6-main cylinder body; 7-disc spring; 8-cage; 9-steel ball; 10-guide rail; 11-guide rod; 12-bearing; 13-gear; 14-piston head; 16-base plate; 17-auxiliary cylinder; 17.1-piston rod; 18-oil filling hole; 19-oil filling hole; 20-setting screw; 21-nut; 22-rack; 23-nut; 24-oil filling hole; 25-oil filling hole. DETAILED DESCRIPTION

[0021] The utility model is further explained below in conjunction with the accompanying drawings:

[0022] Referring to the accompanying drawings, the utility model includes a main oil cylinder and a sub-oil cylinder 17 fixed to the bottom of the main cylinder body by bolts, wherein the main oil cylinder includes a main cylinder body 6, a cylinder cover 5 on the top surface of the main cylinder body 6, and a piston rod 4 inserted into the main cylinder body 6 through the cylinder cover 5, the upper end of the piston rod 4 is connected to the T-type pull rod head 3 through a nut 1, and a piston head 4.1 is provided at the lower end, and also includes a guide rod 11, the upper end of the guide rod 11 passes through the bottom of the main cylinder body 6 and is connected to the piston head 14 by a key (that is, the piston head 14 can move axially along the guide rod 11, and can be driven by the guide rod 11 to rotate in the radial direction. The piston head 4.1), a bearing 12 is provided outside the lower section, and the lower end of the guide rod 11 is equipped with a gear 13 meshing with a rack 22, and the two ends of the rack 22 are fixed to the screw rod 2 through nuts 21 and 23, one end of the screw rod 2 is connected to the piston rod 17.1 of the sub-oil cylinder 17, and a set screw 20 is provided on the wall of the main cylinder body 5 corresponding to the other end. A bottom plate 16 is also provided at the bottom of the main cylinder body 6, and a guide rail is mounted on the bottom plate 16. The lower end of the rack 22 is located on the guide rail 10, and the two are slidably matched.

[0023] The piston rod 4 of the main cylinder body 6 is sheathed with a disc spring 7 , a retainer 8 is provided at the lower end of the disc spring 7 , and a steel ball 9 in contact with the piston head 14 is provided at the bottom of the retainer 8 .

[0024] The main cylinder body 6 is provided with oil filling holes 18 and 19 , and the auxiliary cylinder 17 is provided with oil filling holes 24 and 25 .

[0025] According to the steps of upper mold frame clamping and demoulding, the operation process of the oil cylinder of the utility model is further explained with reference to the accompanying drawings:

[0026] Clamping process:

[0027] Initial state: The main cylinder is in a contracted state under the action of the disc spring 7 ( Figure 1 ).

[0028] Oil is injected into the oil filling hole 18 on the main cylinder body 6, and the oil is returned to the oil hole 19. Under the action of hydraulic pressure, the piston rod 4 is pushed upward to wait for the upper mold frame to be in place under the action of the mold changing trolley. When in place, the T-type tie rod head 3 passes through the locking hole of the upper mold frame and is in place. ( Figure 2 )

[0029] Oil is injected into the oil filling hole 25 on the auxiliary oil cylinder 17, and the oil is returned to the oil hole 24. Under the action of hydraulic pressure, the piston rod 17.1 of the auxiliary oil cylinder 17 pushes the rack 22 to move to one side along the guide rail direction of the bottom plate 16, driving the gear 13 to rotate. The gear 13 drives the guide rod 11 and the piston rod 4 to rotate through the key connection. The combined structure of the bearing 12, the steel ball 9 and the retainer 8 significantly reduces the friction during rotation. When the rack 22 reaches the limit, the T-shaped swivel head 3 rotates 90° ( Figure 3 )

[0030] The main cylinder body 6 is filled with oil from the oil hole 19 and the oil is returned from the oil hole 18. Under the action of hydraulic pressure, the piston rod 4 moves downward and the main cylinder returns to its original position. After reaching the limit position, it is double-locked by the disc spring 7 and hydraulic pressure maintenance, and at the same time, the pressure of each main cylinder is guaranteed to be the same. The entire clamping action is completed ( Figure 1 )

[0031] Demolding process:

[0032] Initial state: The clamping cylinder is in a contracted state under the action of the disc spring 7 and hydraulic pressure. Figure 1 )

[0033] Oil is injected into the oil injection hole 18, and the oil return hole 19 pushes the piston rod 4 to move upward, and the upper mold frame moves downward under the action of its own weight until it lands on the mold change trolley ( Figure 2 ).

[0034] Oil is injected into the oil filling hole 24 on the auxiliary oil cylinder 17, and the oil is returned to the oil hole 25. Under the action of hydraulic pressure, the piston rod 17.1 of the auxiliary oil cylinder 17 pushes the rack 22 to move to the other side along the guide rail direction of the bottom plate 16, driving the gear 13 to rotate in the opposite direction. The gear 13 drives the guide rod 11 and the piston rod 4 to rotate in the opposite direction through the key connection, so that the piston rod 17.1 of the auxiliary oil cylinder 17 returns to its original position. When the rack 22 reaches the limit position on the other side, the T-shaped swivel head 3 rotates 90° in the opposite direction ( Figure 3 ).

[0035] The oil is filled into the oil filling hole 19 of the cylinder body 6, and the oil is returned to the oil hole 18, and the main oil cylinder returns to its original position ( Figure 1 ).

[0036] The mold changing trolley takes up the upper mold and completes the entire demoulding action.

[0037] Maintenance of the cylinder:

[0038] After the oil cylinder has been used for a period of time, it may not rotate properly. In this case, you can adjust the travel of the rack 22 by adjusting the set screw 20, or you can adjust the nuts 21 and 23 on both sides of the rack 22 to change the relative position of the rack 22, and finally adjust the rotation angle of the T-type tie rod head 3 of the clamping cylinder ( Figure 4 ).

Claims

1. A rack type rotary oil cylinder, comprising a main oil cylinder, the main oil cylinder comprising a main cylinder body, a cylinder cover on the top surface of the main cylinder body, and a piston rod inserted into the main cylinder body through the cylinder cover, the upper end of the piston rod is connected to a T-shaped tie rod head, and the lower end is provided with a piston head, characterized in that: It also includes a guide rod, the upper end of which passes through the bottom of the main cylinder body and is connected to the piston head through a key, and the lower end of the guide rod is equipped with a gear meshing with a rack, and the rack is connected to the piston rod of the auxiliary oil cylinder.

2. The rack type rotary cylinder according to claim 1, characterized in that: The auxiliary oil cylinder is fixed to the bottom of the main cylinder body by bolts.

3. The rack type rotary cylinder according to claim 1, characterized in that: A disc spring is sleeved on the piston rod of the master cylinder.

4. The rack type rotary cylinder according to claim 3, characterized in that: A retaining frame is provided at the lower end of the disc spring, and a steel ball in contact with the piston head is provided at the bottom of the retaining frame.

5. The rack type rotary cylinder according to claim 1, characterized in that: A bearing is arranged outside the lower section of the guide rod.

6. The rack type rotary cylinder according to claim 1, characterized in that: A bottom plate is also provided at the bottom of the main cylinder body, a guide rail is mounted on the bottom plate, and the lower end of the rack is located on the guide rail.

7. The rack type rotary cylinder according to claim 1 or 6, characterized in that: The two ends of the rack are fixed on the screw rod via nuts, and one end of the screw rod is connected to the piston rod of the auxiliary oil cylinder.

8. The rack type rotary cylinder according to claim 7, characterized in that: A set screw is arranged on the wall surface of the main cylinder body corresponding to the other end of the screw rod.

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