Hydraulic tailstock of machine tool

Abstract

The utility model discloses a machine tool hydraulic tailstock which comprises a tailstock body, a telescopic ejector pin assembly is arranged on the tailstock body, a tailstock sleeve is arranged above the tailstock body, a core rod is arranged in the tailstock sleeve, one end of the core rod is connected with the ejector pin assembly, the other end of the core rod is connected with a piston rod, and a hydraulic base is arranged at the end, away from the ejector pin assembly, of the tailstock sleeve. A hydraulically-driven hydraulic piston is arranged in the hydraulic seat, and the piston rod penetrates into the hydraulic seat and is connected with the hydraulic piston; one side of the seat body is further provided with an inclined locking channel, the inner side of the locking channel is communicated with the seat sleeve, and a locking assembly acting on the periphery of the core rod is arranged in the locking channel. According to the hydraulic tailstock of the machine tool, the ejector pin assembly is driven in a hydraulic mode so as to adjust the extending length of the ejector pin assembly, and the ejector pin assembly can abut against and clamp a workpiece conveniently; and the internal connection structure is simplified, so that the device is easier to assemble and use.

Description

Technical Field

[0001] The utility model relates to the technical field of machine tools, in particular to a hydraulic tailstock of a machine tool. Background Art

[0002] The tailstock is an auxiliary tooling of the machine tool. During the use of the machine tool, the center of the tailstock is needed to hold the workpiece to achieve the purpose of positioning and clamping. The existing tailstock has a manual control center moving and tightening form. Although this form is simple, it requires manual operation, which is neither convenient nor conducive to the control of the tightening force; there is also a hydraulic control method. Although this control method is easy to control the force, its internal structure is relatively complex, and most of them require a reciprocating piston structure to be set in the mandrel or core rod. Summary of the invention

[0003] The utility model aims to provide a hydraulic tailstock for a machine tool in view of the problems existing in the prior art.

[0004] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0005] A hydraulic tailstock of a machine tool comprises a seat body, a retractable ejector assembly is arranged on the seat body, a seat sleeve is arranged above the seat body, a core rod is arranged in the seat sleeve, one end of the core rod is connected to the ejector assembly, and the other end is connected to a piston rod, a hydraulic seat is arranged at one end of the seat sleeve away from the ejector assembly, a hydraulic piston driven by a hydraulic pressure is arranged in the hydraulic seat, and the piston rod penetrates into the hydraulic seat and is connected with the hydraulic piston; an inclined locking channel is also arranged on one side of the seat body, the inner side of the locking channel is communicated with the seat sleeve, and a locking assembly acting on the outer periphery of the core rod is arranged in the locking channel.

[0006] The hydraulic tailstock of this machine tool improves the driving mode of the ejector assembly and drives the ejector assembly in a hydraulic manner to adjust the extension length of the ejector assembly, making it easier to tighten and clamp the workpiece; and simplifies the internal connection structure, making it easier to assemble and use.

[0007] For the seat body, it is only necessary to install the core rod in its seat sleeve, and the ejector assembly can be installed in the core rod from the end, and the hydraulic system for driving the core rod can be set in the hydraulic seat at the rear; the hydraulic piston can reciprocate in the inner cavity of the hydraulic seat under the action of the hydraulic pressure, and the core rod can be driven to move in the seat sleeve through the connection of the piston rod.

[0008] The locking assembly is arranged in the locking channel, so that the locking assembly can directly act on the lower core rod to clamp and loosen the core rod. The locking assembly also adopts hydraulic locking for easy use.

[0009] Furthermore, a connecting shaft is provided at one end of the piston rod away from the core rod, the connecting shaft passes through the axial middle part of the hydraulic piston and is locked by a fastener, and a sealing ring is provided between the connecting shaft and the inner periphery of the hydraulic piston; a guide slip ring is provided on the outer periphery of the hydraulic piston, and sliding seals are respectively provided on the outer periphery of the hydraulic piston on both sides of the guide slip ring, and a sliding seal is also provided between the piston rod and the hydraulic seat.

[0010] Furthermore, the end of the hydraulic seat is sealed and connected with a hydraulic end cover, an accommodating space is provided between the hydraulic end cover and the hydraulic piston, and a first hydraulic oil inlet and outlet channel is provided on the hydraulic end cover.

[0011] Furthermore, the ejector pin assembly comprises an ejector pin sleeved with the core rod, the end of the ejector pin is connected with a conical ejector pin, and the outer periphery of the ejector pin is also provided with a sealing end cap abutting against the end surface of the core rod.

[0012] Furthermore, the locking assembly includes a fixed block and a slidable movable block arranged in the locking channel, and an axial connecting rod passing through the fixed block and the movable block, the outer peripheral edges of the fixed block and the movable block respectively have arc-shaped pressure grooves adapted to the outer periphery of the core rod, and a reset piece is also provided between the fixed block and the movable block; the fixed block is arranged at the oblique lower end and is locked with the axial connecting rod by a nut, and the other end of the axial connecting rod is provided with a locking end, and the locking end is sleeved on the oblique upper end of the locking channel.

[0013] The fixed block remains in place and supports the outer periphery of the core rod at the connection point. The movable block can move axially along the locking channel (the axial connecting rod) under external drive. When it approaches the outer periphery of the core rod, it can clamp the core rod together with the fixed block, which provides a braking force to prevent the core rod from moving. Generally, it is locked after the position adjustment of the ejector assembly is completed. When it moves upward, it separates from the core rod and can be unlocked.

[0014] Furthermore, the reset member includes a reset spring to facilitate the reset of the movable block. Spring holes are respectively provided on the opposite end surfaces of the movable block and the fixed block, and both ends of the reset spring are respectively connected to the spring holes.

[0015] Furthermore, a plurality of sealing rings are respectively provided on the inner and outer peripheries of the movable block, a sealing ring is also provided on the outer periphery of the locking end, and a second hydraulic oil inlet and outlet channel is provided on the outer wall of the locking channel.

[0016] Furthermore, a bottom plate is provided below the seat body, a plurality of connecting bolts are provided on the bottom plate, and a translation drive assembly and a side limit plate are provided on one side of the bottom plate. By rotating the rotating shaft, the gear can be driven to rotate, and the gear can be coordinated with the rack provided on the upper edge of the machine tool worktable to allow the hydraulic tailstock to translate.

[0017] Furthermore, the translation drive assembly includes a rotating shaft, one end of which passes through the base plate and is provided with a gear on the outer periphery. The outer periphery of the gear is exposed from under the base plate to be engaged with a rack arranged on the workbench of the machine tool; the outer periphery of the rotating shaft is also provided with a bearing and a rotating seal connected to the base plate.

[0018] Furthermore, the side limit plates are a pair arranged vertically, and the pair of side limit plates are respectively connected to the side surfaces of the base plate by bolts.

[0019] Compared with the prior art, the utility model has the following beneficial effects: 1. The hydraulic tailstock of the machine tool improves the driving mode of the ejector assembly, and drives the ejector assembly in a hydraulic manner to adjust the extension length of the ejector assembly, so as to facilitate its jacking and clamping of the workpiece; and simplifies the internal connection structure, making it easier to assemble and use; 2. For the seat body, it is only necessary to install the core rod in its seat sleeve, and the ejector assembly can be installed in the core rod from the end, and the hydraulic system driving the core rod can be arranged in the hydraulic seat at the rear; the hydraulic piston can reciprocate in the inner cavity of the hydraulic seat under the action of the hydraulic pressure, and the core rod can be driven to move in the seat sleeve through the connection of the piston rod; 3. The locking assembly is arranged in the locking channel, so that the locking assembly can directly act on the lower core rod to clamp and release the core rod; 4. By rotating the rotating shaft of the translation drive assembly, the gear can be driven to rotate, and the hydraulic tailstock can be translated by cooperating with the rack arranged on the edge of the machine tool worktable. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a side structural diagram of a hydraulic tailstock of a machine tool according to the utility model;

[0021] Figure 2 This is a front structural schematic diagram of a hydraulic tailstock of a machine tool according to the utility model;

[0022] Figure 3 This is a schematic diagram of the top view of the hydraulic tailstock of a machine tool according to the utility model;

[0023] Figure 4 for Figure 2 Schematic diagram of the BB cross-section structure;

[0024] Figure 5 for Figure 1 Schematic diagram of the AA section structure;

[0025] In the figure: 1. seat body; 101. seat sleeve; 102. bottom plate; 2. ejector pin assembly; 201. ejector rod; 202. ejector pin; 203. sealing end cover; 3. core rod; 4. piston rod; 401. connecting shaft; 5. hydraulic seat; 6. hydraulic piston; 7. fastener; 8. guide slip ring; 9. sliding seal; 10. hydraulic end cover; 11. first hydraulic oil inlet and outlet channel; 12. locking channel; 13. fixed block; 14. movable block; 15. axial connecting rod; 16. locking end; 17. second hydraulic oil inlet and outlet channel; 18. locking channel cover; 19. connecting bolt; 20. rotating shaft; 21. gear; 22. bearing; 23. rotating seal; 24. cover plate; 25. side limit plate; 26. limit groove; 27. limit block; 28. reset spring. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the utility model to clearly and completely describe the technical solution of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0027] In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "middle", "upper", "lower", "left", "right", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0028] like Figure 1 to Figure 5 As shown, a hydraulic tailstock of a machine tool comprises a seat body 1, on which a retractable ejector assembly 2 is provided, a seat sleeve 101 is provided above the seat body 1, a core rod 3 is provided in the seat sleeve 101, one end of the core rod 3 is connected to the ejector assembly 2, and the other end is connected to a piston rod 4, a hydraulic seat 5 is provided at the end of the seat sleeve 101 away from the ejector assembly 2, a hydraulic piston 6 driven by a hydraulic pressure is provided in the hydraulic seat 5, and the piston rod 4 penetrates into the hydraulic seat 5 and is connected with the hydraulic piston 6; an inclined locking channel 12 is also provided on one side of the seat body 1, the inner side of the locking channel 12 is communicated with the seat sleeve 101, and a locking assembly acting on the outer periphery of the core rod is provided in the locking channel 12.

[0029] The hydraulic tailstock of this machine tool improves the driving method of the ejector assembly 2 and drives the ejector assembly 2 hydraulically to adjust the extension length of the ejector assembly 2 to facilitate the tightening and clamping of the workpiece; and simplifies the internal connection structure to make it easier to assemble and use.

[0030] For the seat body 1, it is only necessary to install the core rod 3 in its seat sleeve 101, and the ejector assembly 2 can be installed in the core rod 3 from the end, and the hydraulic system for driving the core rod 3 can be arranged in the hydraulic seat 5 at the rear; the hydraulic piston 6 can reciprocate in the inner cavity of the hydraulic seat 5 under the action of the hydraulic pressure, and through the connection of the piston rod 4, the core rod 3 can be driven to move in the seat sleeve 101.

[0031] The locking assembly is arranged in the locking channel 12, so that the locking assembly can directly act on the lower core rod 3 to clamp and release the core rod 3. The locking assembly also adopts hydraulic locking for ease of use.

[0032] Furthermore, a connecting shaft 401 is provided at one end of the piston rod 4 away from the core rod 3, and the connecting shaft 401 passes through the axial middle part of the hydraulic piston 6 and is locked by a fastener 7. A sealing ring is provided between the connecting shaft 401 and the inner periphery of the hydraulic piston 6; a guide slip ring 8 is provided on the outer periphery of the hydraulic piston 6, and sliding seals 9 are respectively provided on the outer periphery of the hydraulic piston on both sides of the guide slip ring 8, and a sliding seal 9 is also provided between the piston rod 4 and the hydraulic seat 5.

[0033] The piston rod 4 and the connecting shaft 401 are an integral structure, and their diameters are different, so that the connecting shaft 401 with a small diameter passes through the hydraulic piston 6 and is connected thereto; the fastener 7 is a gasket and a nut, etc., which are connected to the end of the connecting shaft to fasten it to the hydraulic piston.

[0034] The arrangement of the sealing ring and the sliding seal can ensure the sealing performance between the components and prevent the hydraulic oil from leaking or flowing into other components. The sliding seal 9 can be an XY-type shaft sealing ring.

[0035] The outer circumference of the hydraulic piston 6 is provided with a limit ring on both sides of the guide slip ring 8, and the sliding seal 9 is provided between the limit ring and the guide slip ring, so that the sliding seal can be limited to prevent it from moving relative to the hydraulic piston. The inner circumference of the end of the piston rod passing through the hydraulic seat is provided with a sealing groove, where a sliding seal that moves relative to the connecting shaft can be provided.

[0036] Furthermore, a hydraulic end cover 10 is sealed and connected to the end of the hydraulic seat 5 , an accommodating space is provided between the hydraulic end cover 10 and the hydraulic piston 6 , and a first hydraulic oil inlet and outlet channel 11 is provided on the hydraulic end cover 10 .

[0037] The hydraulic end cover 10 is connected to the hydraulic seat 5 by multiple screws, and a sealing ring is also provided on the circumference. Grooves are provided on the end faces opposite to the hydraulic end cover 10 and the hydraulic piston 6, respectively, and the two grooves are provided to accommodate fasteners. The first hydraulic oil inlet and outlet channel 11 is connected to an external hydraulic oil pump (hydraulic oil source) through a pipeline, so that hydraulic oil can enter and exit the cavity on the right side of the hydraulic seat to drive the hydraulic piston to move.

[0038] In some embodiments, a hydraulic oil inlet and outlet channel may also be provided on the hydraulic seat 5, which is connected to the cavity on the left side of the hydraulic seat, and cooperates with the oil pressure change in the cavity on the right side to control the movement of the hydraulic piston.

[0039] Furthermore, the ejector assembly 2 includes an ejector rod 201 sleeved with the core rod 3 , a conical ejector pin 202 is connected to the end of the ejector rod 201 , and a sealing end cap 203 abutting against the end surface of the core rod 3 is also provided on the outer periphery of the ejector rod 201 .

[0040] The outer periphery of the push rod 201 has a certain slope, which can be better sleeved in the core rod 3; the sealing end cover 203 plays a dust-proof role to prevent dust from entering the circumferential surface where the push rod and the core rod cooperate, and a dustproof ring is provided between the outer periphery of the end of the core rod 3 and the seat sleeve 101.

[0041] Furthermore, a limiting groove 26 is provided on the outer circumference of the core rod 3 along the length direction, and a detachable limiting block 27 is provided on the seat cover 101, and one end of the limiting block 27 is located in the limiting groove 26. Through the setting of the limiting block 27 and the limiting groove 26, the circumferential movement of the core rod 3 can be limited to prevent its circumferential rotation, and the limiting can also be performed in the length direction, limiting the stroke range of the core rod on the axis.

[0042] Furthermore, the locking assembly includes a fixed block 13 and a slidable movable block 14 arranged in the locking channel 12, and an axial connecting rod 15 passing through the fixed block 13 and the movable block 14, the outer peripheral edges of the fixed block 13 and the movable block 14 respectively have arc-shaped pressure grooves adapted to the outer periphery of the core rod 3, and a reset piece is also provided between the fixed block 13 and the movable block 14; the fixed block 13 is arranged at the oblique lower end and is locked with the axial connecting rod 15 by a nut, and the other end of the axial connecting rod 15 is provided with a locking end 16, and the locking end 16 is sleeved on the oblique upper end of the locking channel 12, and a locking channel cover 18 is detachably connected to the outside.

[0043] The fixed block 13 remains stationary and is located obliquely below, supporting the outer periphery of the core rod at the connection point. The movable block 14 can move axially along the locking channel 12 (the axial connecting rod 15) under external drive. When its arc-shaped pressure groove approaches the outer periphery of the core rod 3, it can clamp the core rod 3 together with the fixed block 13, which provides a braking force to prevent the core rod 3 from moving. Generally, it is locked after the position adjustment of the ejector assembly 2 is completed. When the movable block 14 moves upward, it separates from the core rod 3 and can be unlocked.

[0044] The upper end of the axial connecting rod 15 can be relatively fixed in the locking channel 12 through the locking end 16, and the lower end can fix the fixing block 13 through a nut. The arc-shaped pressure groove is adapted to the outer periphery of the axial connecting rod, and can better clamp the axial connecting rod.

[0045] The reset member is provided to facilitate the reset of the movable block. Specifically, the reset member may include one or more reset springs 28. Spring holes are respectively provided on the opposite end surfaces of the movable block 14 and the fixed block 13. Both ends of the reset spring 28 are respectively connected to the spring holes. After the driving force stops being applied to the movable block, the reset spring will return to the original position to reset the movable block.

[0046] Furthermore, multiple sealing rings are respectively provided on the inner and outer peripheries of the movable block 14, and a sealing ring is also provided on the outer periphery of the locking end 16 to ensure the sealing between the three; a second hydraulic oil inlet and outlet channel 17 is provided on the outer wall of the locking channel 12, through which hydraulic oil can be applied to drive the movable block 14 to move. It can also be driven by passing pressurized gas.

[0047] Furthermore, a base plate 102 is provided under the base body 1, and a plurality of connecting bolts 19 are provided on the base plate 102, through which the entire hydraulic tailstock can be fixed on the workbench of the machine tool and locked with nuts or screw sleeves; a translation drive assembly and a side limit plate 25 are also provided on one side of the base plate 102, so that after the hydraulic tailstock is installed, the hydraulic tailstock can be appropriately moved along the workbench to adjust its position.

[0048] Furthermore, the translation drive assembly includes a rotating shaft 20, one end of which penetrates into the base plate 102 and is sleeved with a gear 21 on the outer periphery, and the outer periphery of the gear 21 is exposed from under the base plate 102 to be engaged with a rack arranged on the workbench of the machine tool; the outer periphery of the rotating shaft 20 is also provided with a bearing 22 (or a rotating sleeve) and a rotating seal 23 connected to the base plate 102.

[0049] By rotating the rotating shaft 20, the gear 21 can be driven to rotate, and the gear 21 can be driven to translate by cooperating with the rack arranged on the edge of the machine tool worktable. The rotating shaft 20 can be rotated by connecting a hand wheel or a motor.

[0050] A cover plate 24 connected by bolts is provided at the lower side of the seat body 1 , and the rotary seal 23 is provided between the cover plate 24 and the rotary shaft 20 ; the cover plate 24 is detachable to facilitate the installation of the translation drive assembly.

[0051] Furthermore, the side limit plates 25 are a pair arranged vertically, and the pair of side limit plates 25 are respectively connected to the side surfaces of the bottom plate 102 by bolts. The lower part of the side limit plates 25 can abut against the side surface of the machine tool worktable, and can form a side limit and guide function during the translation of the hydraulic tailstock, which is conducive to the linear and smooth movement of the hydraulic tailstock.

[0052] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A hydraulic tailstock for a machine tool, comprising a seat body, on which a retractable ejector pin assembly is provided, characterized in that: A seat sleeve is provided above the seat body, a core rod is provided in the seat sleeve, one end of the core rod is connected to the ejector assembly, and the other end is connected to the piston rod, a hydraulic seat is provided at the end of the seat sleeve away from the ejector assembly, a hydraulic piston driven by a hydraulic pressure is provided in the hydraulic seat, and the piston rod penetrates into the hydraulic seat and is connected with the hydraulic piston; an inclined locking channel is also provided on one side of the seat body, the inner side of the locking channel is communicated with the seat sleeve, and a locking assembly acting on the outer periphery of the core rod is provided in the locking channel.

2. The hydraulic tailstock of a machine tool according to claim 1, characterized in that: A connecting shaft is provided at one end of the piston rod away from the core rod. The connecting shaft passes through the axial middle part of the hydraulic piston and is locked by a fastener. A sealing ring is provided between the connecting shaft and the inner periphery of the hydraulic piston. A guide slip ring is provided on the outer periphery of the hydraulic piston. Sliding seals are respectively provided on the outer periphery of the hydraulic piston on both sides of the guide slip ring. A sliding seal is also provided between the piston rod and the hydraulic seat.

3. The hydraulic tailstock of a machine tool according to claim 1, characterized in that: The end of the hydraulic seat is sealed and connected with a hydraulic end cover, a containing space is provided between the hydraulic end cover and the hydraulic piston, and a first hydraulic oil inlet and outlet channel is provided on the hydraulic end cover.

4. The hydraulic tailstock of a machine tool according to claim 1, characterized in that: The ejector pin assembly comprises an ejector pin sleeved with the core rod, the end of the ejector pin is connected with a conical ejector pin, and the outer periphery of the ejector pin is also provided with a sealing end cap abutting against the end surface of the core rod.

5. The hydraulic tailstock of a machine tool according to claim 1, characterized in that: The locking assembly includes a fixed block and a slidable movable block arranged in the locking channel, and an axial connecting rod passing through the fixed block and the movable block, the outer peripheral edges of the fixed block and the movable block respectively have arc-shaped pressure grooves adapted to the outer periphery of the core rod, and a reset piece is also provided between the fixed block and the movable block; the fixed block is arranged at the oblique lower end and is locked with the axial connecting rod through a nut, and the other end of the axial connecting rod is provided with a locking end head, and the locking end head is sleeved on the oblique upper end of the locking channel.

6. The hydraulic tailstock of a machine tool according to claim 5, characterized in that: The reset member comprises a reset spring. Spring holes are respectively arranged on the opposite end surfaces of the movable block and the fixed block. Both ends of the reset spring are respectively connected to the spring holes.

7. The hydraulic tailstock of a machine tool according to claim 5, characterized in that: A plurality of sealing rings are respectively arranged on the inner and outer peripheries of the movable block, a sealing ring is also arranged on the outer periphery of the locking end, and a second hydraulic oil inlet and outlet channel is arranged on the outer wall of the locking channel.

8. The hydraulic tailstock of a machine tool according to claim 1, characterized in that: A bottom plate is also provided below the seat body, a plurality of connecting bolts are provided on the bottom plate, and a translation driving assembly and a side limiting plate are also provided on one side of the bottom plate.

9. The hydraulic tailstock of a machine tool according to claim 8, characterized in that: The translation drive assembly includes a rotating shaft, one end of which penetrates into the base plate and is sleeved with a gear on the outer periphery. The outer periphery of the gear is exposed from the bottom of the base plate to be engaged with a rack arranged on the workbench of the machine tool; the outer periphery of the rotating shaft is also provided with a bearing and a rotating seal connected to the base plate.

10. The hydraulic tailstock of a machine tool according to claim 8, characterized in that: The side limit plates are a pair arranged vertically, and the pair of side limit plates are respectively connected to the side surfaces of the bottom plate by bolts.

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