CN114179428A

CN114179428A - Rotary clamping device and hydraulic machine

Info

Publication number: CN114179428A
Application number: CN202111512283.4A
Authority: CN
Inventors: 马洪勇; 殷文齐; 凌北; 王芳芳; 陈刚; 宋扬
Original assignee: China First Heavy Industries Co Ltd; CFHI Dalian Engineering and Technology Co Ltd
Current assignee: China First Heavy Industries Co Ltd; CFHI Dalian Engineering and Technology Co Ltd
Priority date: 2021-12-08
Filing date: 2021-12-08
Publication date: 2022-03-15
Anticipated expiration: 2041-12-08
Also published as: CN114179428B

Abstract

The invention provides a rotary clamping device and a hydraulic machine, and relates to the technical field of clamping devices. The rotary clamping device comprises a pull rod assembly, a cylinder body, a disc spring, a rotary driving structure, a locking block and a switching mechanism, wherein the pull rod assembly comprises a pull rod penetrating through the cylinder body, a chuck positioned at one axial end of the pull rod and fixedly connected with the pull rod, and a limiting piece fixedly connected with the pull rod and arranged at an interval with the chuck; the dish spring housing is located the pull rod just is located the chuck with between the locating part, the locating part is suitable for overcoming the elastic movement of dish spring and drive the chuck is followed the pull rod axial is inserted the spacing hole of locking piece, the rotary drive structure is suitable for to be worked as the chuck passes drive when spacing hole the rotatory first angle of predetermineeing of pull rod, the shifter is suitable for with the rotary motion of pull rod converts into and follows the axial motion of pull rod.

Description

Rotary clamping device and hydraulic machine

Technical Field

The invention relates to the technical field of clamping devices, in particular to a rotary clamping device and a hydraulic machine.

Background

The rotary clamping device is used for realizing the relative position locking of at least two parts. For example, in a hydraulic forging press, according to the requirements of the production process, the upper anvil needs to be frequently replaced, frequent dismounting and mounting operations need to be performed between the upper anvil and the movable upper beam, the rotary clamping device generally comprises a cylinder body mounted on the movable upper beam and a pull rod slidably disposed in the cylinder body and capable of axially sliding and extending out, a chuck is disposed at a free end of the pull rod, a limiting member (e.g., a nut) is fixed on the pull rod, a spring is sleeved on the pull rod and located between the chuck and the limiting member, the chuck is used for penetrating through a limiting hole in the upper anvil and clamped with an edge of one axial end of the limiting hole under the elastic force of the spring, and locking or unlocking of the upper anvil is achieved through axial rotation of the chuck around the pull rod.

The connection dynamics of the chuck and the edge joint of the axial one end of spacing hole receives the influence of spring force, and when the chuck passed spacing hole and the first height value of the adjacent terminal surface interval of the two along the axial of pull rod, the pull rod was rotatory to drive the rotatory first preset angle of chuck, then removed the drive pull rod and driven the chuck along axial motion and insert the drive power in spacing hole, at this moment, because the existence of this first height value, the spring will partly reset, its elastic potential energy reduces.

At present, in order to provide a sufficient connecting force, the precision of each component of the rotary clamping device, especially the precision of the mounting positions of the chuck and the limiting member, needs to be strictly controlled, and the influence of the first height value on the use effect of the rotary clamping device is avoided. However, the first height value will be larger and smaller due to the influence of friction damage and the like, the elastic force provided by the spring for clamping the chuck with the edge of the axial end of the limiting hole will be smaller and smaller, and the change of the elastic force of the spring caused by the change of the first height value is huge due to the fact that the spring is generally a disc spring, and the use of the rotary clamping device is adversely affected.

Disclosure of Invention

The invention aims to solve the problem that how to reduce the influence of the interval size of the adjacent end surfaces of a chuck of a rotary clamping device and a pull rod when the chuck passes through a limiting hole along the axial direction of the pull rod on the connection performance of the chuck in the related technology to a certain extent.

In order to solve at least one of the above problems to at least some extent, an aspect of the present invention provides a rotary clamping device, which includes a pull rod assembly, a cylinder, a disc spring, a rotary driving structure, a lock block, and a switching mechanism, wherein the pull rod assembly includes a pull rod penetrating through the cylinder, a chuck located at one axial end of the pull rod and fixedly connected to the pull rod, and a position limiting member fixedly connected to the pull rod and spaced from the chuck;

the dish spring housing is located the pull rod just is located the chuck with between the locating part, the locating part is suitable for overcoming the elastic movement of dish spring and drive the chuck is followed the pull rod axial is inserted the spacing hole of locking piece, the rotary drive structure is suitable for to be worked as the chuck passes drive when spacing hole the rotatory first angle of predetermineeing of pull rod, the shifter is suitable for with the rotary motion of pull rod converts into and follows the axial motion of pull rod.

Optionally, the pull rod assembly further includes a pressing block and a piston, the pressing block and the piston are respectively located at two ends of the limiting member along the axial direction of the pull rod, the piston is located at one end of the limiting member away from the chuck, the piston is slidably connected with the cylinder body, and an oil port is formed at one end of the cylinder body away from the chuck; the pressing block is in contact with the piston and forms a first accommodating cavity at an adjacent position, and the limiting piece is accommodated in the first accommodating cavity and is suitable for moving in the first accommodating cavity along the axial direction of the pull rod; the switching mechanism is arranged on the pressing block and the limiting piece, or the switching mechanism is arranged on the piston and the limiting piece.

Optionally, the locating part includes the locating part body, the briquetting includes the briquetting body, the shifter is including set up in first spacing portion on the locating part body and set up in the spigot surface structure on the briquetting body, the spigot surface structure including be suitable for with the first inclined plane structure of first spacing portion contact, work as the chuck passes spacing hole, the rotation drive structure drive when the pull rod is rotatory, follow the rotatory direction of advance of pull rod, first inclined plane structure to keeping away from the one end slope setting of chuck.

Optionally, the pressing block further includes a first supporting surface structure disposed on the pressing block body, and the limiting member further includes a second supporting surface structure disposed on the limiting member body; when the pull rod rotates and advances to a preset position, the second supporting surface structure is flush with the first supporting surface structure, and the second supporting surface structure is suitable for being pressed against the first supporting surface structure under the action of the disc spring.

Optionally, the first supporting surface structure and the guiding surface structure are coaxially arranged, and the first supporting surface structure is located in front of the guiding surface structure and connected with the guiding surface structure along the rotating advancing direction of the pull rod;

the first limiting part comprises a second inclined plane structure matched with the first inclined plane structure, the second supporting surface structure and the second inclined plane structure are coaxially arranged, and the second inclined plane structure is located in front of the second supporting surface structure and connected with the second supporting surface structure along the rotating advancing direction of the pull rod.

Optionally, the rotary clamping device further comprises a first spring and/or a second spring; the first accommodating cavity comprises a first groove structure which is arranged on the pressing block and close to one end of the piston, the limiting piece is accommodated in the first groove structure, and the first spring part is accommodated in the first groove structure and extends out of the first groove structure towards one end close to the piston; a second groove structure is arranged on the limiting piece body and/or the pressing block body, and the second spring part is accommodated in the second groove structure;

when the piston moves towards one end close to the chuck under the driving of hydraulic oil, the first spring is completely accommodated in the first accommodating cavity, and the second spring is completely accommodated in the second groove structure.

Optionally, the rotary clamping device further comprises a sliding guide structure, the sliding guide structure comprises a guide chute and a guide block slidably connected with the guide chute, the guide chute is arranged on the inner wall of the cylinder body, the guide block is arranged on the outer wall of the pressing block, or the guide chute is arranged on the outer wall of the pressing block, the guide block is arranged on the inner wall of the cylinder body, and the sliding direction of the guide block is consistent with the axial direction of the pull rod.

Optionally, the rotary driving structure is a swing cylinder, a housing of the swing cylinder is connected with the cylinder body, and an output shaft of the swing cylinder is connected with the pull rod key.

Compared with the related art, the rotary clamping device has the following advantages:

after the chuck passes through the limiting hole, when the pull rod of the rotary driving structure rotates, the rotary motion of the pull rod can be converted into the motion of axially moving away from one end of the chuck along the pull rod through the conversion mechanism, the interval between the chuck and the adjacent end face of the limiting hole can be reduced (the interval between the upper end face of the chuck and the lower end face of the limiting hole), and therefore the disc spring can keep larger elasticity, and the elasticity of the disc spring cannot be lost due to the interval between the chuck and the adjacent end face of the limiting hole. On one hand, the clamping force of the rotary clamping device is improved, and the connection performance of the rotary clamping device is enhanced; on the other hand, the requirements on the dimensional accuracy of all parts of the rotary clamping device, particularly the requirements on the dimensional accuracy of the chuck, the limiting piece and all the parts between the chuck and the limiting piece along the axial direction of the pull rod are reduced, even if some abrasion is generated, the overlarge influence is not generated, the reliability is high, and the practicability is high.

Another aspect of the invention also provides a hydraulic machine comprising a rotary clamping device as described above.

Optionally, the hydraulic press further comprises a movable cross beam and an upper anvil, the movable cross beam comprises a cross beam body, the upper anvil comprises an anvil body, a cylinder body of the rotary clamping device is connected with the cross beam body, a locking block of the rotary clamping device is connected with the anvil body, a first through hole structure is arranged on the cross beam body, and the first through hole structure and a pull rod of the rotary clamping device are coaxially arranged and are suitable for the pull rod to penetrate through;

the cross beam body is further provided with a first accommodating groove and/or a second accommodating groove, the first accommodating groove and the second accommodating groove are respectively located at two axial ends of the first through hole structure and are respectively communicated with the first through hole structure, the first accommodating groove is suitable for accommodating the cylinder body, and the second accommodating groove is suitable for accommodating a chuck of the rotary clamping device;

the anvil body is provided with a third accommodating groove, the opening of the third accommodating groove faces the movable cross beam, the locking block is installed in the third accommodating groove, the chuck is of a T-shaped structure, and the T-shaped structure is suitable for penetrating through the limiting hole in the locking block and then clamped with the axial edge of the limiting hole.

The hydraulic machine of the invention has all the advantages of the rotary clamping device, and the details are not described here.

Drawings

FIG. 1 is a schematic view of a rotary clamping apparatus according to an embodiment of the present invention;

FIG. 2 is a schematic view of a rotary clamping apparatus according to another embodiment of the present invention;

FIG. 3 is a schematic view of the rotary clamping device of FIG. 2 showing the chuck extending into the position-limiting hole;

FIG. 4 is an enlarged partial view taken at A of FIG. 3 in accordance with the present invention;

fig. 5 is a schematic view of the rotary driving structure of the rotary clamping device in fig. 3 driving the pull rod to drive the chuck to rotate by a first preset angle according to the present invention;

FIG. 6 is an enlarged partial view at B of FIG. 5 of the present invention;

FIG. 7 is a schematic view of the disc spring of the rotary clamping device shown in FIG. 5 driving the pull rod to move so that the chuck abuts against the adjacent end surface of the limiting hole;

FIG. 8 is an enlarged partial view at C of FIG. 7 of the present invention;

fig. 9 is a schematic structural diagram of the connection between the pressing block and the limiting member of the rotary clamping device in the embodiment of the invention:

FIG. 10 is an enlarged partial view taken at D of FIG. 9 in accordance with the present invention;

FIG. 11 is a schematic structural view of the compact of FIG. 9 in accordance with the present invention;

FIG. 12 is an enlarged partial view taken at E of FIG. 11 in accordance with the present invention;

fig. 13 is a schematic structural view illustrating the second supporting surface structure and the first supporting surface structure of the positioning member of fig. 9 abutting against each other after the positioning member rotates by a first predetermined angle;

FIG. 14 is an enlarged fragmentary view at F of FIG. 13 in accordance with the present invention;

fig. 15 is a schematic structural view illustrating the pressing of the first inclined surface structure and the second inclined surface structure according to another embodiment of the present invention.

Description of reference numerals:

1-a pull rod assembly, 11-a pull rod, 12-a chuck, 13-a press block, 131-a press block body, 1311-a cylinder body, 1312-a limit plate, 132-a first support surface structure, 14-a limit piece, 141-a limit piece body, 142-a second support surface structure, 15-a piston, 16-a first accommodating cavity, 161-a first groove structure, 162-a second groove structure, 2-a cylinder body, 21-a cylinder body, 22-a cylinder cover, 221-an oil port, 3-a disc spring, 4-a rotary driving structure, 41-a swing cylinder, 411-a shell, 412-an output shaft, 413-a swing cylinder mounting rack, 5-a lock block, 51-a limit hole, 6-a movable beam, 61-a beam body, 611-a first through hole structure, 612-a first accommodating groove, 613-a second accommodating groove, 7-an upper anvil, 71-an anvil body, 711-a third accommodating groove, 81-a first limiting part, 811-a second inclined plane structure, 82-a guide plane structure, 821-a first inclined plane structure, 91-a first spring and 92-a second spring.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the description herein, references to the terms "an embodiment," "one embodiment," "some embodiments," "exemplary" and "one embodiment," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or embodiment is included in at least one embodiment or embodiment of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or implementation. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or implementations.

The terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature.

In the drawings, the Z-axis represents the vertical, i.e., up-down, position, and the positive direction of the Z-axis (i.e., the arrow of the Z-axis points) represents up, and the negative direction of the Z-axis (i.e., the direction opposite to the positive direction of the Z-axis) represents down; in the drawings, the X-axis represents a horizontal direction and is designated as a left-right position, and a positive direction of the X-axis (i.e., an arrow direction of the X-axis) represents a right side and a negative direction of the X-axis (i.e., a direction opposite to the positive direction of the X-axis) represents a left side; it should also be noted that the foregoing Z-axis and X-axis representations are merely intended to facilitate the description of the invention and to simplify the description, and are not intended to indicate or imply that the device or element so referred to must be oriented, constructed or operated in a particular manner and therefore should not be considered as limiting the invention.

As shown in fig. 1 to 4, an embodiment of the present invention provides a rotary clamping device, which includes a pull rod assembly 1, a cylinder body 2, a disc spring 3, a rotary driving structure 4, a locking block 5 and a converting mechanism, wherein the pull rod assembly 1 includes a pull rod 11 penetrating through the cylinder body 2, a chuck 12 located at one axial end of the pull rod 11 and fixedly connected to the pull rod 11, and a limiting member 14 fixedly connected to the pull rod 11 and spaced from the chuck 12;

the disc spring 3 is sleeved on the pull rod 11 and located between the chuck 12 and the limiting piece 14, the limiting piece 14 is suitable for overcoming the elastic force movement of the disc spring 3 and driving the chuck 12 to be inserted into the limiting hole 51 of the locking block 5 along the axial direction of the pull rod 11, the rotary driving structure 4 is suitable for driving the pull rod 11 to rotate by a first preset angle when the chuck 12 passes through the limiting hole 51, and the converting mechanism is suitable for converting the rotary movement of the pull rod 11 into the movement along the axial direction of the pull rod 11.

It should be noted that the rotary clamping device is used for connecting (or clamping and locking) two structures to be connected, in particular, connecting (or clamping and locking) along the axial direction of the pull rod 11 (i.e., the Z-axis direction in fig. 1), and the two structures to be connected are respectively the movable cross beam 6 and the upper anvil 7 of the hydraulic machine, which will be taken as an example in this specification to illustrate the content of the present invention.

As shown in fig. 2, specifically, the movable beam 6 includes a beam body 61, the upper anvil 7 includes an anvil body 71, the cylinder 2 is connected to the beam body 61, the lock block 5 is connected to the anvil body 71, and an end of the pull rod 11 where the upper chuck 12 is located passes through the beam body 61 and is inserted into the limiting hole 51 of the lock block 5, during which process, the movement of the pull rod 11 needs to overcome the elastic force of the disc spring 3, that is, the elastic potential energy of the disc spring 3 is increased. When the cartridge 12 passes through the limiting hole 51 and is located at a lower limit position (the lower limit position is a position at which the cartridge 12 is located at the lowermost position), the cartridge 12 is spaced from the adjacent end surface of the limiting hole 51 by a first height value (i.e., a first height value is spaced between the upper end surface of the cartridge 12 and the lower end surface of the limiting hole 51), and at this time, the elastic potential energy of the disc spring 3 reaches the maximum. The pull rod 11 is driven by the rotation driving structure 4 to rotate by a first preset angle (for example, 90 °), at this time, a large gap is formed between the chuck 12 and the limiting hole 51, and a projection of the chuck 12 on the cross section of the limiting hole 51 is at least partially located outside a range covered by the limiting hole 51. During the rotation of the drawbar 11, the conversion mechanism converts the rotational movement (e.g., rotation in the first direction) of the drawbar 11 into the upward movement, so that the interval between the upper end surface of the collet 12 and the lower end surface of the stopper hole 51 becomes small, and during this process, the compression amount of the disc spring 3 is kept constant and the elastic potential energy thereof is kept constant. After the pull rod 11 rotates by the first preset angle, the chuck 12 and the adjacent end surface of the limiting hole 51 are spaced by a second height value, which is greater than or equal to zero and smaller than the first height value. Preferably, a small gap is formed between the chuck 12 and the limiting hole 51. Thus, when the driving force for driving the pull rod 11 to move downwards (i.e. in the opposite direction of the Z axis) is removed, the disc spring 3 pushes the pull rod 11 to move upwards by a very small distance (i.e. the second height value) through the interference with the limiting member 14, so that the interference between the chuck 12 and the axial end face of the limiting hole 51 can be realized, and the loss of the elastic force of the disc spring 3 due to the space between the chuck 12 and the adjacent end face of the limiting hole 51 is small.

In this specification, unless otherwise specified, the following descriptions are provided. The interval between the cartridge 12 and the adjacent end surface of the stopper hole 51 is an interval between the upper end surface of the cartridge 12 and the lower end surface of the stopper hole 51 after the cartridge 12 passes through the stopper hole 51. In addition, during the process of rotating the pull rod 11 by the first preset angle, the pull rod does not need to move upwards all the time, but can also keep the position in the up-down direction unchanged at a partial position, or keep moving downwards at a partial position, and finally the interval between the chuck 12 and the adjacent end surface of the limiting hole 51 is reduced, which will not be described in detail herein.

This arrangement is advantageous in that, when the pull rod 11 of the rotary drive mechanism 4 rotates after the cartridge 12 passes through the position limiting hole 51, the rotary motion of the pull rod 11 can be converted into a motion toward the end away from the cartridge 12 in the axial direction of the pull rod 11 by the conversion mechanism, and the gap between the cartridge 12 and the adjacent end face of the position limiting hole 51 will be reduced (the gap between the upper end face of the cartridge 12 and the lower end face of the position limiting hole 51), so that the disc spring 3 will maintain a large elastic force without losing the elastic force of the disc spring 3 due to the gap between the cartridge 12 and the adjacent end face of the position limiting hole 51. On one hand, the clamping force of the rotary clamping device is improved, and the connection performance of the rotary clamping device is enhanced; on the other hand, the requirements on the dimensional accuracy of each component of the rotary clamping device, particularly the requirements on the dimensional accuracy of the chuck 12, the limiting piece 14 and each component between the chuck and the limiting piece along the axial direction of the pull rod 11 are reduced, even if some abrasion is generated, the influence on the axial accuracy is not too great, the reliability is high, and the practicability is strong.

As shown in fig. 1, in the embodiment of the present invention, the drawbar assembly 1 further includes a pressing block 13 and a piston 15, the pressing block 13 and the piston 15 are respectively located at two ends of the limiting member 14 along the axial direction of the drawbar 11, the piston 15 is located at one end of the limiting member 14 away from the collet 12, the piston 15 is slidably connected to the cylinder 2, and one end of the cylinder 2 away from the collet 12 is provided with an oil port 221; the pressing block 13 is in contact with the piston 15 and forms a first accommodating cavity 16 at an adjacent position, and the limiting piece 14 is accommodated in the first accommodating cavity 16 and is suitable for moving in the first accommodating cavity 16 along the axial direction of the pull rod 11; the conversion mechanism is provided on the pressure block 13 and the stopper 14, or the conversion mechanism is provided on the piston 15 and the stopper 14.

As shown in fig. 2, for example, the adjacent end of the piston 15 and/or the pressing block 13 is provided with a first groove structure 161, the first groove structure 161 is coaxially disposed with the pull rod 11, and the limiting member 14 is a lock nut, and the lock nut is threadedly connected with the pull rod and is received in the first receiving cavity 16. The adjacent position is the adjacent position of the upper end of the pressing block 13 and the lower end of the piston 15, for example, one end of the pressing block 13 close to the piston 15 is provided with the first groove structure 161, the opening direction of the first groove structure 161 is axially directed to the pressing block 13 along the pull rod 11, and the end surface of the piston 15 close to the pressing block 13 and the first groove structure 161 surround to form the first accommodating cavity 16.

Illustratively, as shown in fig. 2, the cylinder block 2 includes a cylinder block body 21 and a cylinder head 22, an upper end of the cylinder block body 21 is provided with an opening, the cylinder head 22 is provided with the oil port 221, and hydraulic oil entering from the oil port 221 enters the cylinder block 2 and contacts with an end surface of one end of the piston 15 far away from the chuck 12, so as to provide a driving force for downward movement of the piston 15.

As shown in fig. 3 and 4, the hydraulic oil is injected into the oil port 221, and when the piston 15 moves downward under the action of the hydraulic oil, the elastic potential energy of the disc spring 3 increases. When the cartridge 12 passes through the stopper hole 51 and is located at the lower limit position, the distance between the cartridge 12 and the adjacent end surface of the stopper hole 51 in the axial direction of the drawbar 11 is the first height value L1, and the elastic potential energy of the disc spring 3 is maximized. At this time, one end of the disc spring 3 abuts against the lower end face inside the cylinder body 2, the other end abuts against the lower end face of the pressing block 13, the disc spring 3 is balanced in stress, the limiting member 14 can move in the axial direction of the pull rod 11 in the first accommodating cavity 16, the elastic force of the disc spring 3 cannot be transmitted to the limiting member 14 and the pull rod 11 fixedly connected with the limiting member 14, and the pull rod 11 is only influenced by the self gravity and the first spring 91 and the second spring 92. As shown in fig. 5 and 6, when the rotation driving structure 4 drives the pull rod 11 to rotate by the first preset angle, the friction force generated by the rotation of the chuck 12 due to the pressure of the disc spring 3 is not generated, and the friction force is significantly reduced.

The conversion mechanism is disposed on the pressing block 13 and the limiting member 14, or the conversion mechanism is disposed on the piston 15 and the limiting member 14, so that the structure is more compact, and the description of the present invention will be given by taking the example that the conversion mechanism is disposed on the pressing block 13 and the limiting member 14, but the present invention is not limited thereto, and the positions of other structures may need to be adaptively changed according to the positions where the conversion mechanism is disposed, and will not be described in detail herein.

As shown in fig. 7 and 8, the hydraulic oil is discharged, and the upper end surface of the cartridge 12 abuts against the lower end surface of the stopper hole 51. When hydraulic oil is discharged, under the action of the disc spring 3, the pressing block 13 moves upwards and abuts against the lower end face of the limiting part 14, so that the pull rod 11 and the chuck 12 are driven by the limiting part 14 to move upwards until the chuck 12 abuts against the adjacent end face of the limiting hole 51. The clamping of the movable cross beam 6 and the upper anvil 7 is realized, and the disc spring 3 is balanced in stress between the chuck 12 and the limiting piece 14. And the decrease of the upward movement distance of the pull rod 11 and the chuck 12 in the process is greatly reduced (specifically, the difference between the first height value and the second height value) due to the arrangement of the switching mechanism.

The advantage of this arrangement is that since the limiting member 14 can move along the axial direction of the pull rod 11 in the first accommodating cavity 16, when the piston 15 is driven by the driving force to overcome the elastic movement of the disc spring 3, the pull rod 11 and the chuck 12 fixedly connected with the pull rod 11 are only influenced by the self gravity and the first spring 91 and the second spring 92, when the rotary driving structure 4 drives the pull rod 11 and the chuck 12 fixedly connected with the pull rod 11 to rotate, the pull rod 11 does not need to bear the huge elastic force generated by the disc spring 3, so that the huge friction force generated by the elastic force of the disc spring 3 is avoided, the friction force generated by the rotation of the pull rod 11 is small, the problem of the service life of the pull rod 11 caused by friction is avoided, the power requirement for the rotary driving structure 4 can also be reduced (in this state, the friction force is small, even the rotation of the pull rod 11 can be realized by using a manual tool), the disc spring 3 capable of providing a larger elastic force can be selected, the rotary clamping of larger load is realized; moreover, the conversion mechanism is arranged on the pressing block 13 and the limiting piece 14, or the conversion mechanism is arranged on the piston 15 and the limiting piece 14, so that the structure is more compact; meanwhile, the switching mechanism is prevented from being damaged due to huge friction force, so that the device has stronger applicability, high reliability and strong practicability.

As shown in fig. 1 and 9 to 14, the limiting member 14 includes a limiting member body 141, the pressing block 13 includes a pressing block body 131, the converting mechanism includes a first limiting portion 81 provided on the limiting member body 141 and a guide surface structure 82 provided on the pressing block body 131, the guide surface structure 82 includes a first inclined surface structure 821 adapted to contact with the first limiting portion 81, and the first inclined surface structure 821 is inclined toward an end away from the chuck 12 in a rotation advancing direction of the draw bar 11.

The rotational movement direction of the tie rod 11 means that the tie rod 11 rotates clockwise with its axis as a rotation axis. As shown in fig. 11 and 13, the first inclined surface structure 821 is inclined upward along the rotation advancing direction of the pull rod 11, and when the pull rod 11 rotates and advances, the first inclined surface structure 821 contacts with the first position-limiting portion 81 to force the first position-limiting portion 81 to move upward during the rotation advancing process.

It should be noted that the arrangement of the first inclined surface structure 821 and the first limiting portion 81 is not limited, and when the arrangement of the first inclined surface structure 821 is changed, the arrangement of the first limiting portion 81 is also changed accordingly.

Illustratively, the first position-limiting portion 81 includes a second inclined surface structure 811, and the second inclined surface structure 811 matches the first inclined surface structure 821. When the rotation driving structure 4 drives the pull rod 11 to rotate clockwise, and the second inclined surface structure 811 contacts the first inclined surface structure 821, the pull rod 11 continues to rotate clockwise, and under the action of the first inclined surface structure 821, the second inclined surface structure 811 moves relative to the first inclined surface structure 821, and the limiting part 14 drives the pull rod 11 to move upwards, in the process, because the hydraulic pressure provided by the hydraulic oil is transmitted to the disc spring 3 through the piston 15 and the pressing block 13, the pressing block 13 is subjected to a large positive pressure, and when the pull rod 11 rotates, the pressing block 13 cannot rotate along with the rotation.

As shown in fig. 15, in some embodiments, the first height value is small, for example, 0-3 mm, when the pull rod 11 moves upward for a certain distance in the axial direction, the oil port 221 discharges oil, and under the elastic force of the disc spring 3, because the slope of the first slope structure 821 and the second slope structure 811 is small, the two structures can transmit the elastic force of the disc spring 3 in a pressing manner, and can also be kept stable without relative movement.

The advantage of setting up like this is that, realizes the conversion of pull rod 11 direction of motion through first inclined structure 821, and its simple structure, the reliability is high, and the practicality is strong.

As shown in fig. 9 to 14, the pressing block 13 further includes a first supporting surface structure 132 disposed on the pressing block body 131, and the limiting member 14 further includes a second supporting surface structure 142 disposed on the limiting member body 141; when the pull rod 11 rotates to advance to the preset position, the second supporting surface structure 142 is flush with the first supporting surface structure 132, and the second supporting surface structure 142 is suitable for being pressed against the first supporting surface structure 132 under the action of the disc spring 3.

Illustratively, when the pull rod 11 rotationally advances to a preset position, the first limiting portion 81 moves on the guide surface structure 82 to a terminal end (the terminal end is an end of the guide surface structure 82 located in the rotational advancing direction of the pull rod 11), at this time, the second support surface structure 142 moves from the position of the low-pressure first support surface structure 132 (during this movement, it may be always moving upward, or it may be moving upward first, and then moving downward, and the displacement of the downward movement is smaller than that of the upward movement, which may be determined according to the shape structure of the guide surface structure 82) to be flush with the first support surface structure 132, the pull rod 11 is continuously driven to rotationally advance by the rotational driving structure 4, the first limiting portion 81 is disengaged from the guide surface structure 82, and the second support surface structure 142 moves to be directly above the first support surface structure 132 or is in contact with the first support surface structure 132. The hydraulic oil is then discharged and the first support surface structure 132 is pressed against the second support surface structure 142 by the disc spring 3, and the displacement of the upward movement of the cartridge 12 will be reduced (much less than the first height value), so that the disc spring 3 can provide a greater clamping force.

The advantage that sets up like this lies in, through the first holding surface structure 132 that establishes in addition and the second holding surface structure 142 support the elasticity of transmission dish spring 3, needn't adopt first spacing portion 81 and the guide surface structure 82 to support pressing and realize the elasticity transmission of dish spring 3, and the contact surface of first holding surface structure 132 and second holding surface structure 142 can be perpendicular to the axial setting of pull rod 11, and its force stability is high, and the reliability is high, and the practicality is strong.

As shown in fig. 11 to 14, the first supporting surface structure 132 is connected to the guide surface structure 82 and located in front of the guide surface structure 82 in the rotational advancing direction of the drawbar 11;

the first position-limiting portion 81 includes a second inclined surface structure 811 matching the first inclined surface structure 821, the second supporting surface structure 142 is connected to the second inclined surface structure 811, and the second inclined surface structure 811 is connected to the second supporting surface structure 142 and located in front of the second supporting surface structure 142 along the rotation advancing direction of the drawbar 11.

As shown in fig. 11 to 14, exemplarily, the first supporting surface structure 132 is disposed coaxially with the guiding surface structure 82, and the second supporting surface structure 142 is disposed coaxially with the second inclined surface structure 811, it should be noted that, when the first supporting surface structure 132 is disposed coaxially with the guiding surface structure 82, it can be understood that the projections of the first supporting surface structure 132 and the guiding surface structure 82 on the cross section of the compact 13 are located in the same annular region. The second supporting surface structure 142 and the second inclined surface structure 811 are coaxially disposed, and it can be understood that projections of the second supporting surface structure 142 and the second inclined surface structure 811 on the cross section of the limiting member 14 are located in the same circular ring area, and will not be described in detail herein.

Illustratively, during the rotation and advance of the drawbar 11, when the rear end of the second inclined surface structure 811 is in a state of being disengaged from the front end of the first inclined surface structure 821, the second supporting surface structure 142 is flush with the first supporting surface structure 132, the rotation driving structure 4 continues to drive the drawbar 11 to rotate in the clockwise direction, the rear end of the second inclined surface structure 811 is disengaged from the front end of the first inclined surface structure 821, and the front end of the second supporting surface structure 142 is in contact with the rear end of the first supporting surface structure 132. After the rotary driving structure 4 continues to drive the pull rod 11 to rotate by a certain angle in the clockwise direction, the second supporting surface structure 142 and the first supporting surface structure 132 have a larger contact surface, so that the elastic force transmission of the disc spring 3 can be realized.

The advantage that sets up like this lies in, simple structure, and the reliability is high, and its structural arrangement is compact, and the practicality is strong.

As shown in fig. 2, the rotary clamping device further comprises a first spring 91 and/or a second spring 92; the first accommodating cavity 16 includes a first groove structure 161 disposed at an end of the pressing block 13 close to the piston 15, the limiting member 14 is accommodated in the first groove structure 161, and the first spring 91 is partially accommodated in the first groove structure 161 and extends out of the first groove structure 161 toward the end close to the piston 15; the position-limiting member body 141 and/or the pressing block body 131 are/is provided with a second groove structure 162, and the second spring 92 is partially accommodated in the second groove structure 162; when the piston 15 is driven by hydraulic oil to move toward the end close to the chuck 12, the first spring 91 is completely accommodated in the first accommodating cavity 16, and the second spring 92 is completely accommodated in the second groove structure 162.

As shown in fig. 2 and 9 to 14, for example, the pressing block body 131 includes a cylinder 1311 and a limiting plate 1312 extending along the radial direction of the cylinder 1311, the cylinder 1311 and the pressing block body 131 are connected to form a first groove structure 161, and the pull rod 11 is inserted through the cylinder 1311 and the limiting plate 1312; the guide surface structure 82 and the first position-limiting portion 81 are disposed at adjacent ends of the position-limiting plate 1312 and the position-limiting member body 141, respectively.

The second groove structure 162 is disposed at an end of the limiting member body 141 close to the limiting plate 1312, and an opening of the second groove structure 162 faces the limiting plate 1312.

The first spring 91 and/or the second spring 92 are provided so as not to affect the contact between the first stopper 81 and the guide surface structure 82. Under the hydraulic action of the hydraulic oil, the piston 15 drives the pull rod 11 to move downwards, the first spring 91 and the second spring 92 are compressed, and the piston 15 is pressed against the pressing block 13. During the rotation of the pull rod 11 driven by the rotation driving structure 4, the first spring 91 and the second spring 92 are compressed to ensure that the first limiting portion 81 can contact with the guide surface structure 82, and the first spring 91 and the second spring 92 can be both compression springs, which will not be described in detail herein.

The arrangement has the advantages that the arrangement of the first spring 91 and/or the second spring 92 enables the disc spring 3 to be basically in a natural extension state when the rotary clamping device is assembled, for example, when the limiting member 14, the piston 15 and the cylinder head 22 are assembled, the limiting member 14, the piston 15 and the cylinder head 22 only need to be assembled by mainly overcoming the elastic force of the first spring 91 and/or the second spring 92, the assembly and disassembly operation is simple, a special tool is not needed for assembly and disassembly, the operation difficulty is low, and the safety is high; after assembly is completed, under the action of the first spring 91 and/or the second spring 92, pre-pressure in the axial direction of the pull rod 11 is provided among the cylinder cover 22, the piston 15 and the press block 13, so that the looseness is not easy to occur, and the stability is high; in addition, when a driving force for driving the piston 14 to move downwards is applied (i.e. when hydraulic oil is injected), the first spring 91 and/or the second spring 92 are compressed, at this time, the disc spring 3 is a working spring, and the first groove structure 161 and the second groove structure 162 can respectively play a role in protecting the first spring 91 and the second spring 92, so that the first spring 91 and/or the second spring 92 are prevented from being damaged due to excessive stress; correspondingly, when the rotary driving structure 4 drives the pull rod 11 to rotate by a first preset angle, the chuck 12 is locked with the lock block 5, and the driving force for driving the piston 14 to move downwards (i.e. when hydraulic oil is discharged), under the action of the disc spring 3, the pressing block 13 is abutted against the limiting part 14, the locking force of the chuck 12 and the lock block 5 in the axial direction of the pull rod 11 is all improved by the disc spring 3 with a larger elastic coefficient, and the safety of the first spring 91 and/or the second spring 92 is high.

In the above embodiment, the arrangement manner of the conversion mechanism may also be that the circumferential side wall of the cylinder 1311 is provided with a guide groove, the guide surface structure 82 is arranged on the side wall of the guide groove, the first limiting portion 81 is a limiting column which is connected to the circumferential side wall of the pressing block body 131 and extends along the radial direction of the pressing block body 131, the limiting column is inserted into the guide groove, when the rotary driving structure 4 drives the pull rod 11 to rotate and advance, the limiting column contacts with the guide surface structure 82, and converts the rotation of the pull rod 11 into the movement along the axial direction, at this time, the movement of the pull rod 11 along the axial direction is more flexible, which may move upwards and then downwards, during the downward movement, the second support surface structure 142 contacts with the first support surface structure 132, and then may discharge hydraulic oil, so as to realize the clamping between the chuck 12 and the axial edge of the limiting hole 51, which will not be described in detail herein.

In the above embodiment, the rotary clamping device further includes a sliding guide structure, the sliding guide structure includes a guide chute and a guide block slidably connected to the guide chute, the guide chute is disposed on the inner wall of the cylinder body 2, and the guide block is disposed on the outer wall of the pressing block 13, or the guide chute is disposed on the outer wall of the pressing block 13, the guide block is disposed on the inner wall of the cylinder body 2, and the sliding direction of the guide block is consistent with the axial direction of the pull rod 11.

The advantage of setting up like this is that briquetting 13 possesses along the axial sliding guide of pull rod 11 to, when pull rod 11 rotated along rotatory direction of advance, this sliding guide structure ensured that briquetting 13 can not take place to rotate, and the rotatory atress of pull rod 11 is more stable, and the reliability is high, and the practicality is strong.

As shown in fig. 2, in the embodiment of the present invention, the rotary drive mechanism 4 is a swing cylinder 41, a housing 411 of the swing cylinder 41 is connected to the cylinder block 2, and an output shaft 412 of the swing cylinder 41 is connected to the pull rod 11 through a spline and a spline groove.

Illustratively, the output shaft 412 is provided with splines, and one end of the pull rod 11 away from the collet 12 is provided with spline grooves, and the splines are inserted in the spline grooves.

The rotary clamping device further comprises a swing cylinder mounting 413, the housing 411 is fixedly connected with the swing cylinder mounting 413, and the swing cylinder mounting 413 is detachably connected with the cylinder body 2. For example, the swing cylinder mounting frame 413 is connected to the cylinder body 21, or the swing cylinder mounting frame 413 is connected to the cylinder head 22, and the swing cylinder mounting frame 413 and the cylinder head 22 may be connected to the cylinder body 21 by a common fastening member, which will not be described in detail herein.

The advantage of setting up like this is that, provides the rotatory drive power of pull rod 11 through swing cylinder 41, avoids pull rod 11 to cause the influence to swing cylinder 41 along axial motion through spline and spline groove, and for other drive methods (for example, drive pull rod 11 through the connecting rod and rotate), its mounting structure is compacter, and stability is high, and the practicality is strong.

Another embodiment of the invention also provides a hydraulic machine comprising a rotary clamping device as described above.

The advantage of setting up like this is that can realize the connection of two parts of this hydraulic press through this rotary clamping device, and it has higher suitability in the occasion that needs frequent dismouting, and life is high, and security and reliability are high.

As shown in fig. 3 to 8, in the embodiment of the present invention, the beam body 61 is further provided with a first receiving groove 612 and/or a second receiving groove 613, the first receiving groove 612 and the second receiving groove 613 are respectively located at two axial ends of the first through hole structure 611 and are respectively communicated with the first through hole structure 611, the first receiving groove 612 is adapted to receive the cylinder 2, and the second receiving groove 613 is adapted to receive the chuck 12 of the rotating clamping device.

Illustratively, as shown in fig. 2, the cylinder body 21 is accommodated in the first accommodation groove 612, the cylinder body 21 is detachably connected to the cross beam body 61, when the rotary clamping device releases the connection relationship between the cross beam body 61 and the anvil body 71, the pressing block 13 drives the pull rod 11 and the chuck 12 to move axially along the pull rod 11 toward the end away from the upper anvil 7 under the action of the elastic force of the disc spring 3, and the chuck 12 is entirely accommodated in the second accommodation groove 613, at this time, the lower end face of the cross beam body 61 is not blocked at the opening edge of the second accommodation groove 613, so that a contact surface for assembling other components, such as other types of upper anvils, can be provided, and reliability and stability are high.

The hydraulic press has the advantages that the mounting structure of the rotary clamping device is compact, the overall structure of the hydraulic press is more compact, the arrangement of other components is convenient, the structure is simple, and the practicability is high.

In an embodiment of the present invention, as shown in fig. 2 to 8, the anvil body 71 is provided with a third receiving groove 711, an opening of the third receiving groove 711 faces the movable cross beam 6, the locking block 5 is installed in the third receiving groove 711, and the chuck 12 is configured as a T-shaped structure, wherein the T-shaped structure is adapted to pass through the limiting hole 51 on the locking block 5 and then be clamped with an axial edge of the limiting hole 51.

Specifically, the lock block 5 is detachably connected to the anvil body 71 by a fastener, and the upper end surface of the lock block 5 is lower than the upper end surface of the anvil body 71 or flush with the upper end surface of the anvil body 71.

After the T-shaped structure penetrates through the limiting hole 51 on the locking block 5, the T-shaped structure rotates for a first preset angle under the action of the rotary driving structure 4, then the oil port 221 discharges oil, and under the action of the disc spring 3, the T-shaped structure is clamped with the axial edge of the limiting hole 51, so that the movable cross beam 6 and the upper anvil 7 are locked.

The hydraulic press has the advantages that the hydraulic press is more compact in structure, the contact surface of the upper anvil 7 and the movable cross beam 6 is smoother, the connection stability and reliability are high, and the practicability is high.

However, it is not limited thereto, for example, other locking structures may be provided between the locking piece 5 and the chuck 12, and the locking structures may be locked after the chuck 12 is rotated by the first preset angle, which will not be described in detail herein.

In the embodiment of the present invention, the rotary clamping device may be further provided with a corresponding sealing and lubricating structure, which may adopt the related art and will not be described in detail herein. For example, one end of the cylinder body 2 close to the chuck 12 is provided with a second through hole structure suitable for the pull rod 11 to penetrate through, and a self-lubricating bearing is arranged in the second through hole structure. Sealing elements such as sealing rings are arranged between the piston 15 and the cylinder body 21, between the piston 15 and the pull rod 11, and between the piston 15 and the cylinder cover 22, and hydraulic oil entering from the oil port 221 acts on the end face of the piston 15 far away from the chuck 12, which is not described in detail herein.

Although the present disclosure has been described above, the scope of the present disclosure is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present disclosure, and such changes and modifications will fall within the scope of the present invention.

Claims

1. A rotary clamping device is characterized by comprising a pull rod assembly (1), a cylinder body (2), a disc spring (3), a rotary driving structure (4), a locking block (5) and a conversion mechanism, wherein the pull rod assembly (1) comprises a pull rod (11) penetrating through the cylinder body (2), a chuck (12) located at one axial end of the pull rod (11) and fixedly connected with the pull rod (11), and a limiting piece (14) fixedly connected with the pull rod (11) and arranged at an interval with the chuck (12);

dish spring (3) cover is located pull rod (11) and be located chuck (12) with between locating part (14), locating part (14) are suitable for overcoming the elastic motion of dish spring (3) and drive chuck (12) are followed pull rod (11) axial is inserted spacing hole (51) of locking piece (5), rotary drive structure (4) are suitable for when chuck (12) pass drive when spacing hole (51) the rotatory first predetermined angle of pull rod (11), the shifter is suitable for with the rotary motion of pull rod (11) converts the edge to the axial motion of pull rod (11).

2. The rotary clamping device according to claim 1, wherein the draw bar assembly (1) further comprises a pressing block (13) and a piston (15), the pressing block (13) and the piston (15) are respectively located at two ends of the limiting piece (14) along the axial direction of the draw bar (11), the piston (15) is located at one end of the limiting piece (14) far away from the chuck (12), the piston (15) is connected with the cylinder body (2) in a sliding manner, and one end of the cylinder body (2) far away from the chuck (12) is provided with an oil port (221); the pressing block (13) is in contact with the piston (15) and forms a first accommodating cavity (16) at an adjacent position, and the limiting piece (14) is accommodated in the first accommodating cavity (16) and is suitable for moving in the first accommodating cavity (16) along the axial direction of the pull rod (11); the switching mechanism is arranged on the pressure block (13) and the limiting piece (14), or the switching mechanism is arranged on the piston (15) and the limiting piece (14).

3. The rotary clamping device according to claim 2, wherein the retaining member (14) comprises a retaining member body (141), the pressing block (13) comprises a pressing block body (131), the converting mechanism comprises a first retaining portion (81) provided on the retaining member body (141) and a guide surface structure (82) provided on the pressing block body (131), the guide surface structure (82) comprises a first inclined surface structure (821) adapted to contact with the first retaining portion (81), and when the chuck (12) passes through the retaining hole (51), the rotary driving structure (4) drives the pull rod (11) to rotate, the first inclined surface structure (821) is inclined toward an end away from the chuck (12) along a rotational advancing direction of the pull rod (11).

4. The rotary clamping device according to claim 3, wherein the press block (13) further comprises a first support surface structure (132) provided to the press block body (131), and the retainer (14) further comprises a second support surface structure (142) provided to the retainer body (141); when the pull rod (11) rotates and advances to a preset position, the second supporting surface structure (142) is flush with the first supporting surface structure (132), and the second supporting surface structure (142) is suitable for being pressed against the first supporting surface structure (132) under the action of the disc spring (3).

5. The rotary clamping device according to claim 4, characterized in that the first support surface structure (132) is connected with the guide surface structure (82) and is located in front of the guide surface structure (82) in the direction of rotational advancement of the drawbar (11);

the first limiting part (81) comprises a second inclined surface structure (811) matched with the first inclined surface structure (821), and the second inclined surface structure (811) is connected with the second supporting surface structure (142) and is positioned in front of the second supporting surface structure (142) along the rotating advancing direction of the pull rod (11).

6. A rotary clamping device according to claim 3, characterized by further comprising a first spring (91) and/or a second spring (92);

the first accommodating cavity (16) comprises a first groove structure (161) which is arranged at one end of the pressing block (13) close to the piston (15), the limiting piece (14) is accommodated in the first groove structure (161), and the first spring (91) is partially accommodated in the first groove structure (161) and extends out of the first groove structure (161) to one end close to the piston (15); a second groove structure (162) is arranged on the limiting piece body (141) and/or the pressing block body (131), and part of the second spring (92) is accommodated in the second groove structure (162);

when the piston (15) moves towards one end close to the chuck (12) under the driving of hydraulic oil, the first spring (91) is completely accommodated in the first accommodating cavity (16), and the second spring (92) is completely accommodated in the second groove structure (162).

7. The rotary clamping device according to claim 2, further comprising a sliding guide structure, wherein the sliding guide structure comprises a guide chute and a guide block slidably connected with the guide chute, the guide chute is arranged on the inner wall of the cylinder body (2), the guide block is arranged on the outer wall of the pressing block (13), or the guide chute is arranged on the outer wall of the pressing block (13), the guide block is arranged on the inner wall of the cylinder body (2), and the sliding direction of the guide block is consistent with the axial direction of the pull rod (11).

8. Rotary clamping device according to claim 1, characterized in that the rotary drive structure (4) is a swing cylinder (41), the housing (411) of the swing cylinder (41) being connected with the cylinder block (2), the output shaft (412) of the swing cylinder (41) being keyed with the draw rod (11).

9. Hydraulic machine, characterized in that it comprises a rotary clamping device according to any one of claims 1 to 6.

10. The hydraulic machine according to claim 9, characterized in that it further comprises a movable cross beam (6) and an upper anvil (7), said movable cross beam (6) comprises a cross beam body (61), said upper anvil (7) comprises an anvil body (71), said cylinder (2) of the rotary clamping device is connected with said cross beam body (61), said lock block (5) of the rotary clamping device is connected with said anvil body (71), said cross beam body (61) is provided with a first through hole structure (611), said first through hole structure (611) is arranged coaxially with said pull rod (11) of the rotary clamping device and is adapted for the penetration of said pull rod (11);

the beam body (61) is further provided with a first accommodating groove (612) and/or a second accommodating groove (613), the first accommodating groove (612) and the second accommodating groove (613) are respectively located at two axial ends of the first through hole structure (611) and are respectively communicated with the first through hole structure (611), the first accommodating groove (612) is suitable for accommodating the cylinder body (2), and the second accommodating groove (613) is suitable for accommodating a chuck (12) of the rotary clamping device;

anvil body (71) are provided with third storage tank (711), the opening orientation of third storage tank (711) movable cross beam (6), locking piece (5) install in third storage tank (711), chuck (12) set up to T type structure, T type structure is suitable for to pass behind spacing hole (51) on locking piece (5) with the axial edge joint of spacing hole (51).