A built-in full-range locking device for presses

Abstract

The present invention belongs to the technical field of press equipment, and specifically discloses a built-in full-range locking device for a press, including a frame assembly, a double-headed locking cylinder, and two sets of locking units. The frame assembly is fixed in the press, and the center of the frame assembly is provided with a through hole for the pull rod of the press to pass through; the two sets of locking units are located on both sides of the pull rod; the double-headed locking cylinder is fixed on the frame assembly, and the piston rods on both sides of the double-headed locking cylinder are respectively used to drive the locking unit to lock or unlock the pull rod of the press. The above locking device can solve the problem that there is no full-range locking device in the domestic prior art, and the locking device is installed externally and occupies external space.

Description

Technical Field

[0001] The invention belongs to the technical field of press equipment, and in particular relates to a built-in full-range locking device for a press. Background Art

[0002] Press is the abbreviation of press, hydraulic press and oil press. Press refers to a molding machine used for industrial products to be molded by pressure. It generally uses a hydraulic cylinder, so it is also called an oil press.

[0003] The locking devices of domestic presses mostly use segmented and top dead center locking methods to lock the pull rods and sliders in the presses. They are not flexible enough in actual use and cannot be actively locked in abnormal situations such as power failure or oil failure, which poses a safety hazard. Foreign presses have full-range locking devices, but they use the inclined wedge locking principle and external installation method, which will increase the space occupied by the press. Summary of the invention

[0004] The purpose of the present invention is to provide a built-in full-range locking device for a press to solve the problem that there is no full-range locking device in the domestic prior art and the locking device is installed externally and occupies external space.

[0005] In order to achieve the above-mentioned purpose, the technical solution of the present invention is: a full-range locking device for a built-in press, including a frame assembly, a double-headed locking cylinder and two groups of locking units. The frame assembly is fixed in the press, and a through hole for a pull rod in the press to pass through is provided in the center of the frame assembly; the two groups of locking units are located on both sides of the pull rod; the double-headed locking cylinder is fixed on the frame assembly, and the piston rods on both sides of the double-headed locking cylinder are respectively used to drive the locking units to lock or unlock the pull rod in the press.

[0006] Furthermore, each group of the locking units includes an elastic member, a connecting rod assembly, a chuck assembly and an eccentric shaft, the elastic member is located in the rod cavity of the double-head locking cylinder, the chuck assembly is provided with a central shaft hole, the eccentric shaft is fixed in the central shaft hole, the frame assembly is provided with a mounting hole, the eccentric shaft is rotatably connected in the mounting hole; one side of the connecting rod assembly is hinged to the piston rod of the double-head locking cylinder, and the other side is fixed to the eccentric shaft; the protruding side of the eccentric shaft enables the chuck assembly to lock the pull rod, and the other side of the eccentric shaft enables the chuck assembly to unlock the pull rod.

[0007] Furthermore, a groove is provided on one side of the clamp assembly for locking the pull rod, and the groove can hold the pull rod.

[0008] Furthermore, the cross section of the chuck assembly is triangular.

[0009] Furthermore, a friction gasket is provided in the groove.

[0010] Furthermore, the eccentric rotating shaft and the connecting rod assembly are fixed by a conical expansion sleeve.

[0011] Furthermore, the elastic member is a disc spring.

[0012] The working principle of this technical solution is as follows: Under normal conditions, the disc spring in the double-headed locking cylinder will pull the piston rod to the center position, so that the piston rod drives the eccentric shaft to rotate toward the center shaft through the connecting rod assembly under the elastic force of the disc spring, and the amplified clamping force is applied to the outer surface of the pull rod through the chuck assembly, thereby holding the pull rod by friction to achieve the locking purpose. When the pull rod tends to move downward, the reverse friction force generated by the groove of the chuck assembly will try to drive the eccentric shaft to rotate toward the center, thereby continuing to increase the clamping force. Within the effective range of the clamping force, the heavier the slider, the more reliable the clamping will be. When unlocking, pressurized oil is introduced into the double-headed locking cylinder to overcome the elastic force, causing the piston rod to extend, and the eccentric shaft is driven to rotate through the connecting rod assembly, so that the chuck assembly leaves the surface of the pull rod to complete the unlocking.

[0013] The beneficial effects of this technical solution are: ① Two groups of locking units are provided, making the clamping more secure. ② A groove is provided on the chuck assembly to increase the force-bearing area and make the clamping force distribution more reasonable. ③ The frame assembly is fixed inside the press to achieve built-in installation and save external space. ④ The groove can improve the distribution of the clamping force, making the clamping of the chuck assembly more reliable. ⑤ The cross-section of the chuck assembly is triangular, which can maximize the force-bearing area while reducing its own mass. ⑥ The elastic part adopts a disc spring, which is convenient to replace. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a front view of a built-in press full-range locking device of the present invention;

[0015] Figure 2 for Figure 1 Left view of

[0016] Figure 3 for Figure 1 A top view of

[0017] Figure 4 for Figure 1 The front view of the middle chuck assembly;

[0018] Figure 5 for Figure 4 Left view of

[0019] Figure 6 for Figure 4 A top view of

[0020] Figure 7 for Figure 1 Structural diagram of the double-head locking cylinder;

[0021] Figure 8 for Figure 1 The structural diagram of the eccentric rotating shaft;

[0022] Fig. 9 for Figure 1 Force model diagram. DETAILED DESCRIPTION

[0023] The following is further described in detail through specific implementation methods:

[0024] The figure marks in the drawings of the specification include: frame assembly 1, double-head locking cylinder 2, connecting rod assembly 3, chuck assembly 4, eccentric shaft 5, piston rod 6, disc spring 7, rod cavity 8, pull rod 9, slider 10, center shaft hole 11, groove 12, friction gasket 13, mounting hole 14.

[0025] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] The embodiment is basically as shown in the attached Figure 1-9 As shown: a built-in full-range locking device for a press, including a frame assembly 1, a double-headed locking cylinder 2 and two sets of locking units. The frame assembly 1 is fixed in the press, and a through hole is provided in the center of the frame assembly 1 for the press middle tie rod 9 to pass through; the two sets of locking units are located on both sides of the tie rod 9; the double-headed locking cylinder 2 is fixed on the frame assembly 1, and the piston rods 6 on both sides of the double-headed locking cylinder 2 are respectively used to drive the locking units to lock or unlock the press middle tie rod 9.

[0027] Each locking unit includes an elastic member, a connecting rod assembly 3, a chuck assembly 4 and an eccentric shaft 5. The elastic member adopts a disc spring 7, which makes replacement more convenient. The elastic member is located in the rod cavity 8 of the double-head locking oil cylinder 2. The chuck assembly 4 is provided with a central shaft hole 11, and the eccentric shaft 5 is fixed in the central shaft hole 11. The frame assembly 1 is provided with a mounting hole 14, and the eccentric shaft 5 is rotatably connected in the mounting hole 14; one side of the connecting rod assembly 3 is hinged with the piston rod 6 of the double-head locking oil cylinder 2, and the other side is fixed with the eccentric shaft 5 through a conical expansion sleeve; the protruding side of the eccentric shaft 5 can enable the chuck assembly 4 to lock the pull rod 9, and the other side of the eccentric shaft 5 can enable the chuck assembly 4 to unlock the pull rod 9. The side of the chuck assembly 4 for locking the pull rod 9 is provided with a groove 12, and the groove 12 can hold the pull rod 9. The cross section of the chuck assembly 4 is triangular, and a friction pad 13 is arranged in the groove 12. In this embodiment, a composite material with a high friction coefficient is used.

[0028] The specific implementation process is as follows:

[0029] Under normal conditions, the disc spring 7 in the double-headed locking oil cylinder 2 will pull the piston rod 6 to the center position, so that the piston rod 6 drives the eccentric shaft 5 to rotate toward the center axis through the connecting rod assembly 3 under the elastic force of the disc spring 7, and the amplified clamping force is applied to the outer surface of the pull rod 9 through the chuck assembly 4, so that the pull rod 9 is held by friction to achieve the purpose of locking. When the pull rod 9 tends to move downward, the reverse friction force generated by the groove 12 of the chuck assembly 4 will try to drive the eccentric shaft 5 to rotate toward the center, thereby continuing to increase the clamping force. Within the effective range of the clamping force, the heavier the slider 10, the more reliable the clamping will be. When unlocking, the pressure oil is introduced into the double-headed locking oil cylinder 2 to overcome the elastic force, so that the piston rod 6 extends, and the eccentric shaft 5 is driven to rotate through the connecting rod assembly 3, so that the chuck assembly 4 leaves the surface of the pull rod 9, completing the unlocking.

[0030] The following is also a description of the parameter calculation in the design process of this device:

[0031] 1. Design goal: Clamping force G ≤ 100KN. The clamping force G is equal to the total weight of the slider and the pull rod, and is also equal to the friction force F between the chuck assembly and the pull rod.

[0032] 2. Determination of friction material: The initial friction coefficient μ=0.4~0.5.

[0033] 3. Calculation of the positive pressure W applied by the eccentric shaft at the clamping position: G*β=W*μ, β is the design margin of the clamping force, β=1.2.

[0034] 4. Calculation and verification of contact area S and specific pressure: Determine according to the following formula, initially determine the inner sleeve height of the chuck assembly H = 300mm, and the pull rod diameter d = 100mm;

[0035] S=α*H*(πd); W / S≤p;

[0036] Among them, p is the allowable specific pressure of the friction material, α is the effective coefficient of friction area, α=0.85.

[0037] 5. Self-locking condition verification: According to the following formula, the radius of the outer ring of the eccentric shaft is initially determined to be R = 80mm, the radius of the inner ring of the eccentric shaft is r = 46mm, the eccentric distance is e = 10mm, the angle γ between the line connecting the two centers of the eccentric shaft and the line connecting the clamping force contact point and the center of the outer ring of the eccentric shaft is 135°, and the friction angle is expressed as ψ, μ = tanψ;

[0038]

[0039] 6. Calculation of the initial clamping force Q applied by the double-head locking cylinder on the eccentric shaft: Calculate according to the following formula, the initial force arm length L = 250mm;

[0040]

[0041] After calculation and verification through the above steps, it is proved that the values ​​are reasonable and the mechanism design is feasible.

[0042] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0043] The above is only an embodiment of the present invention. The common sense such as the known specific structure and characteristics in the scheme is not described in detail here. The ordinary technicians in the relevant field know all the common technical knowledge in the technical field of the invention before the application date or priority date, can obtain all the existing technologies in the field, and have the ability to apply the conventional experimental means before that date. The ordinary technicians in the relevant field can improve and implement this scheme in combination with their own abilities under the enlightenment given by this application. Some typical known structures or known methods should not become obstacles for ordinary technicians in the relevant field to implement this application. It should be pointed out that for those skilled in the art, without departing from the structure of the present invention, several deformations and improvements can be made, which should also be regarded as the protection scope of the present invention, which will not affect the effect of the implementation of the present invention and the practicality of the patent. The protection scope required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. A built-in press full-range locking device, characterized in that: It includes a frame assembly, a double-headed locking cylinder and two sets of locking units. The frame assembly is fixed in the press. The center of the frame assembly is provided with a through hole for the pull rod of the press to pass through. The two sets of locking units are located on both sides of the pull rod. The double-headed locking cylinder is fixed on the frame assembly. The piston rods on both sides of the double-headed locking cylinder are respectively used to drive the locking units to lock or unlock the pull rod of the press. Each group of the locking units comprises an elastic member, a connecting rod assembly, a chuck assembly and an eccentric shaft, wherein the elastic member is located in the rod cavity of the double-head locking oil cylinder, the chuck assembly is provided with a central shaft hole, the eccentric shaft is fixed in the central shaft hole, the frame assembly is provided with a mounting hole, and the eccentric shaft is rotatably connected in the mounting hole; one side of the connecting rod assembly is hinged to the piston rod of the double-head locking oil cylinder, and the other side is fixed to the eccentric shaft; the protruding side of the eccentric shaft enables the chuck assembly to lock the pull rod, and the other side of the eccentric shaft enables the chuck assembly to unlock the pull rod; Under normal circumstances, the elastic part in the double-head locking cylinder will pull the piston rod to the center position. Under the elastic force of the elastic part, the piston rod drives the eccentric shaft to rotate toward the center through the connecting rod assembly, and the amplified clamping force is applied to the outer surface of the pull rod through the chuck assembly.

2. A built-in press full-range locking device according to claim 1, characterized in that: A groove is provided on one side of the clamp assembly for locking the pull rod, and the groove can hold the pull rod.

3. The built-in full-range locking device for a press according to claim 1, characterized in that: The cross section of the chuck assembly is triangular.

4. The built-in full-range locking device for a press according to claim 2, characterized in that: A friction pad is arranged in the groove.

5. The built-in full-range locking device for a press according to claim 1, characterized in that: The eccentric rotating shaft and the connecting rod assembly are fixed by a conical expansion sleeve.

6. The built-in full-range locking device for a press according to claim 1, characterized in that: The elastic member is a disc spring.

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