Guide pillar type rotary oil cylinder

Abstract

The utility model discloses a guide pillar type rotary oil cylinder which comprises a main cylinder body, a cylinder cover arranged on the top face of the main cylinder body, a piston rod penetrating through the cylinder cover and inserted into the main cylinder body, and a guide pillar. 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. The upper end of the guide column is inserted into a column groove in the bottom of the piston head and connected through a ball guide groove structure, the lower end of the guide column is inserted into an oil groove in the bottom of the main cylinder body, and the oil groove is communicated with the oil groove oil injection hole. The utility model has the advantages of simple structure, simplicity in operation, small volume, high reliability, good sealing performance, smooth action, difficulty in blockage, good flexible adaptability and easiness in overhaul and maintenance.

Description

Technical Field

[0001] The utility model relates to the field of hot die forging, in particular to a guide column 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 be able to operate flexibly in two degrees of freedom. The space occupied by the assembly is still too large and cannot adapt to the smaller internal space of the die changing system inside the hot die forging press.

[0003] Patent No. 201110256362.3 discloses a telescopic rotary hydraulic cylinder, which includes a cylinder body, a piston and a piston rod. Piston rods are provided on both sides of the piston. A rotary guide device is provided between the piston rod and the cylinder body on at least one side of the piston. The rotary guide device includes a spiral guide groove provided on the piston rod, and a limit screw plug is fixed on the inner wall of the cylinder body in cooperation with the spiral guide groove. The limit screw plug is stuck in the spiral guide groove and can slide along the spiral guide groove. The above scheme only needs to control the rotation of the piston rod, but the following problems still exist: 1) During rotation, the entire piston rod rotates in the cylinder body, which may cause a loose seal and leakage. 2) When the limit screw plug is used in cooperation with the guide groove, the guide groove is unevenly stressed during rotation, is easy to wear, and is easy to get stuck. 3) The stretching and rotation are performed simultaneously, and the stretching or rotation action of the cylinder cannot be controlled separately, and the flexibility is poor. Summary of the invention

[0004] The purpose of the utility model is to solve the above technical problems and to provide a guide column type rotary cylinder with simple structure, simple operation, small size, high reliability, good sealing, smooth movement, not easy to get stuck, good flexibility and adaptability, and easy inspection and maintenance.

[0005] The technical solution includes a main cylinder body, a cylinder cover on the top surface of the main cylinder body, and a piston rod passing through the cylinder cover and inserted into the main cylinder body. 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 column. The upper end of the guide column is inserted into a column groove at the bottom of the piston head and is connected through a ball guide groove structure. The lower end of the guide column is inserted into an oil groove at the bottom of the main cylinder body, and the oil groove is connected to the oil groove oil filling hole.

[0006] The ball guide groove structure comprises a spiral guide groove arranged on the upper section of the guide column, a ball groove arranged on the column groove wall, and a ball correspondingly arranged between the spiral guide groove and the ball groove.

[0007] The spiral guide groove is composed of a spiral segment at the upper section and a straight segment at the lower section.

[0008] A pressure cover is also provided at the column notch.

[0009] The lower end of the guide column is connected to the oil groove through a spline.

[0010] A disc spring is sleeved on the piston rod of the master cylinder.

[0011] 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.

[0012] The bottom surface of the gland is provided with a guide groove, and the top surface of the bottom of the main cylinder body is provided with a guide ring corresponding to the guide groove.

[0013] The utility model adds a guide column on the basis of the traditional oil cylinder, and uses the two ends of the guide column to be inserted into the column groove of the piston head and the oil groove at the bottom of the main cylinder body respectively. The original main cylinder body structure can drive the piston rod to move up and down. At the same time, by adding independent oil filling holes and oil grooves, the vertical movement of the guide column is converted into a rotational movement that drives the piston rod to rotate by using a ball guide groove structure. Both the extension and rotation movements can be controlled simultaneously or separately, with good flexibility and sealing performance; the ball guide groove structure makes the guide groove evenly stressed and not easy to wear and jam; a pressure cover is also provided at the column groove to effectively solve the sealing problem; the lower end of the guide column is connected to the oil groove by a spline to ensure that the guide column is only extended and retracted in the axial direction; the piston rod of the main cylinder body is sheathed with a disc spring to balance the weight of the lower mold, reduce the required hydraulic pressure, and enable the oil 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. All the main structures are inside the oil cylinder, reducing the risk of oil leakage.

[0014] The utility model has the advantages of simple structure, simple operation, small size, high reliability, good sealing, smooth movement, no jamming, good flexibility and adaptability, and easy inspection and maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 A half-section view of the present invention;

[0016] Figure 2 is a diagram showing a first working state;

[0017] Figure 3 is a diagram showing a second working state;

[0018] Figure 4is a diagram showing the third working state;

[0019] Figure 5 It is a schematic diagram of the structure of the guide column.

[0020] In the figure: 1-nut; 2-piston head; 3-T-type tie rod head; 4-piston rod; 5-cylinder head; 6-main cylinder body; 7-upper oil filling hole; 8-disc spring; 9-cage; 10-steel ball; 11-lower oil filling hole; 12-oil tank oil filling hole; 13-guide column; 14-bottom; 15-pressure cover; 16-lower cage; 17-ball; 18-oil tank; 19-ball groove; 20-spiral guide groove; 21-spiral segment; 22-straight segment; 23-spline; 24-guide groove; 25-guide ring; 26-column groove. DETAILED DESCRIPTION

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

[0022] See also Figure 1 The utility model includes a main cylinder body 6 provided with an upper oil filling hole 7 and a lower oil filling hole 11, 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 a T-type tie rod head 3, and the lower end is provided with a piston head 2; the piston rod 4 is sheathed with a disc spring 8, the lower end of the disc spring 8 is provided with a retainer 9, and the bottom of the retainer 9 is provided with a steel ball 10 in contact with the piston head 2. The piston rod 4 can be driven to move axially by oil pressure, and the disc spring 8 is used to provide a reaction force, so that the main oil cylinder 6 has a reset function when it is not filled with oil; the steel ball 1 between the retainer 9 and the piston head 2 can reduce the friction between the piston head 2 and the disc spring 8 when it rotates, thereby improving the service life.

[0023] The upper end of the guide column 13 is inserted into the column groove 26 at the bottom of the piston head 2 and connected through a ball guide groove structure. The lower end of the guide column 13 is inserted into the oil groove 18 at the bottom of the main cylinder body 6 and connected to the oil groove 18 through a spline 23. The oil groove 18 is connected to the oil groove oil filling hole 12.

[0024] The ball guide groove structure includes a spiral guide groove 20 arranged on the upper section of the guide column 13, a ball groove 19 arranged on the wall of the column groove 26, and a ball 17 correspondingly arranged between the spiral guide groove 20 and the ball groove 19. The spiral guide groove 20 is composed of a spiral section 21 in the upper section and a straight section 22 in the lower section. The ball guide groove structure can be used to convert the axial movement of the guide column driven by the hydraulic oil into a rotational operation and transmit it to the piston head 2, so that it rotates. Since the guide column 13 is only controlled by the oil inlet hole 12 of the oil tank, the axial movement and rotation of the piston rod 4 can be controlled separately, and the axial and rotational strokes are flexible and controllable.

[0025] A gland 15 is also provided at the mouth of the column groove 26, and a guide groove 24 is provided on the bottom surface of the gland 15. A guide ring 25 corresponding to the guide groove 24 is provided on the top surface of the bottom of the main cylinder body 6. The gland 15 can ensure the sealing inside the column groove 25, and the guide groove 24 and the guide ring 25 can cooperate to seal when the piston rod 4 moves downward, further guiding and avoiding the occurrence of leakage problems caused by loose sealing.

[0026] According to the steps of upper mold frame clamping and demoulding, the utility model is described in detail with reference to the accompanying drawings:

[0027] Clamping steps:

[0028] The piston rod 4 is first located in the initial position ( Figure 1 ), oil is injected into the lower oil injection hole 11, and oil is returned to the upper oil injection hole 7. The piston rod 4 moves upward, and the guide column 13 does not move. However, due to the existence of the ball guide groove structure, the piston head 2 moves upward and drives the ball 17 to roll from the straight section 22 to the upper end of the spiral section 21 along the spiral guide groove 20. The piston head 2 rotates at the same time, and the piston rod 4 drives the T-type tie rod head 3 to stretch and rotate accordingly to reach the working position ( Figure 2 ).

[0029] Wait for the upper mold frame to be in place under the action of the mold changing trolley. When in place, the T-shaped pull rod head 3 of the clamping cylinder passes through the clamping hole of the mold frame and is in place.

[0030] Oil is injected into the oil filling hole 12 of the oil groove, and the guide column 13 is hydraulically pushed to move axially upward. The ball 17 moves from the spiral section 21 to the straight section 22 in the spiral guide groove 20, causing the piston head 2 to rotate in the opposite direction, driving the piston rod 4 and the T-type tie rod head 3 to start rotating in the opposite direction.

[0031] After rotating to the right position, the upper oil filling hole 7 is filled with oil, the lower oil filling hole 11 returns oil, and the oil tank oil filling hole 12 returns oil at the same time. The piston rod 4 and the guide column 13 are retracted at the same time under the action of hydraulic pressure and disc spring 8 to achieve the purpose of locking. Figure 4 )

[0032] Unlocking steps:

[0033] The initial state is locked ( Figure 4 ), oil is injected into the lower oil injection hole 11, oil is returned from the upper oil injection hole 7, and oil is injected into the oil tank oil injection hole 12 at the same time. The piston rod 4 and the guide column 13 move upward as a whole under the action of hydraulic pressure, driving the T-type tie rod head 3 to stretch ( Figure 3 ).

[0034] The upper mold frame moves down under its own weight until it lands on the mold changing trolley.

[0035] The oil returns from the oil filling hole 12 of the oil tank, and the guide column 13 moves downward. Due to the existence of the ball guide groove structure, the ball 17 rolls along the spiral guide groove 20 from the straight section 22 to the spiral section 21, and the piston head 2 rotates at the same time, driving the piston rod 4 and the T-type tie rod head 3 to start rotating ( Figure 2 ).

[0036] After rotating into place, the mold changing trolley takes out the upper mold, completing the entire demoulding action.

Claims

1. A guide column type rotary 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, wherein 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 column, the upper end of which is inserted into the column groove at the bottom of the piston head and connected through a ball guide groove structure, and the lower end of the guide column is inserted into the oil groove at the bottom of the main cylinder body, and the oil groove is connected to the oil groove oil filling hole.

2. The guide column type rotary cylinder according to claim 1, characterized in that: The ball guide groove structure comprises a spiral guide groove arranged on the upper section of the guide column, a ball groove arranged on the column groove wall, and balls correspondingly arranged between the spiral guide groove and the ball groove.

3. The guide column type rotary cylinder according to claim 2, characterized in that: The spiral guide groove is composed of a spiral segment at the upper section and a straight segment at the lower section.

4. The guide column type rotary cylinder according to claim 1, characterized in that: A pressure cover is also provided at the column notch.

5. The guide column type rotary cylinder according to any one of claims 1 to 4, characterized in that: The lower end of the guide column is connected to the oil groove through a spline.

6. The guide column type rotary cylinder according to any one of claims 1 to 4, characterized in that: A disc spring is sleeved on the piston rod of the master cylinder.

7. The guide column type rotary cylinder according to claim 6, 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.

8. The guide column type rotary cylinder according to claim 4, characterized in that: The bottom surface of the gland is provided with a guide groove, and the top surface of the bottom of the main cylinder body is provided with a guide ring corresponding to the guide groove.

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