Tailstock hydraulic locking structure

Abstract

The utility model belongs to the technical field of machine tools, and discloses a tailstock hydraulic locking structure which comprises two oil cylinders assembled on a base, the locking sides of piston rods of the oil cylinders are connected with a locking pressing plate arranged below the base, and the non-locking sides of the piston rods of the oil cylinders are connected through rigid connecting pieces. When one oil cylinder fails to be locked due to long-term oil leakage caused by the structural problem of a sealing ring, the other oil cylinder can keep the position of a piston rod of the oil cylinder stable due to normality, so that the position of the piston rod of the failed oil cylinder can be kept stable through traction of the rigid connecting piece, and the locking reliability of the tailstock of the machine tool can be improved; the problems that according to an existing tailstock hydraulic locking structure, due to long-term oil seepage of one oil cylinder due to the sealing ring structure problem, locking fails, and the locking reliability of a machine tool tailstock is poor are solved.

Description

Technical Field

[0001] The utility model belongs to the technical field of machine tools, and in particular relates to a locking structure for a tailstock of a machine tool. Background Art

[0002] When the tailstock of the machine tool is slidably mounted on the guide rail of the bed surface, it is locked and fixed through a hydraulic locking structure. The existing hydraulic locking structure is generally composed of two hydraulic cylinders and a locking pressure plate. The locking pressure plate is fixedly connected to the locking side of the piston rods of the two hydraulic cylinders. The piston rods of the two cylinders act synchronously to lift and pull back the locking pressure plate to fix the tailstock. The piston rods of the two cylinders act synchronously to lower and loosen the fixation of the tailstock. The non-locking sides of the piston rods of the two cylinders are independent of each other.

[0003] During operation, if one of the cylinders leaks oil for a long time due to problems with the sealing ring structure, the locking of the cylinder will fail, affecting the locking reliability of the hydraulic locking structure on the tailstock of the machine tool. Utility Model Content

[0004] In view of the deficiencies in the prior art, the utility model aims to provide a tailstock hydraulic locking structure, in which the non-locking sides of the two oil cylinder piston rods are integrally connected through a rigid connector, thereby improving the locking reliability of the tailstock of the machine tool.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A tailstock hydraulic locking structure comprises two oil cylinders assembled on a base, wherein the locking side of the piston rod of the oil cylinder is connected to a locking pressure plate arranged below the base, and the non-locking side of the piston rod of the oil cylinder is connected by a rigid connecting piece, and when the other oil cylinder fails due to oil leakage, the piston rod of one of the two oil cylinders is kept in position by the rigid connecting piece.

[0007] The utility model has the following beneficial effects:

[0008] The non-locking sides of the two cylinder piston rods of the tailstock hydraulic locking structure are integrally connected through a rigid connector. When one of the cylinders fails to lock due to long-term oil leakage due to a problem with the sealing ring structure, the other cylinder can maintain the stability of its piston rod position due to normal operation. Then, the piston rod of the failed cylinder can also maintain a stable position through the pulling of the rigid connector, thereby improving the locking reliability of the machine tool tailstock. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 This is a three-dimensional diagram of the tailstock of a machine tool involved in the utility model;

[0010] Figure 2 for Figure 1 A three-dimensional view of the base of the tailstock of the machine tool shown;

[0011] Figure 3 for Figure 1 A top view of the base of the machine tool tailstock is shown;

[0012] Figure 4 for Figure 3 AA section view in;

[0013] Figure 5 Another implementation structure of the rigid connector involved in the utility model;

[0014] Figure 6 Another implementation structure of the rigid connector involved in the utility model;

[0015] Figure 7 This is another implementation structure of the rigid connecting piece involved in the utility model.

[0016] In the figure: 1. base; 2. hydraulic locking structure; 11. assembly cavity; 12. assembly surface; 13. bottom wall of seat; 14. through hole; 21. first oil cylinder; 22. second oil cylinder; 23. locking pressure plate; 24. piston connecting rod; 25. half connecting rod; 26. matching clamping groove; 27. screw hole; 28. connecting hole; 29. ​​connecting rod; 231. fastening hole; 232. fastening bolt; 241. countersunk hole. DETAILED DESCRIPTION

[0017] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments, so as to more clearly understand the technical concept to be protected by the present invention.

[0018] like Figure 1 The tailstock of the machine tool shown is arranged on the machine tool bed to cooperate with the spindle box to support or clamp the workpiece to be processed. A base 1 is arranged at the bottom of the tailstock, and the base 1 is assembled on the bed guide rail so that the tailstock is movably installed on the surface of the machine tool bed. The base 1 is provided with a hydraulic locking structure 2 to lock and fix the tailstock to the bed guide rail.

[0019] Hydraulic locking structure 2, such as Figure 2-4 The figure includes a first oil cylinder 21, a second oil cylinder 22, a locking pressure plate 23 and a piston connecting rod 24. The base 1 is provided with an assembly cavity 11. The top of the assembly cavity 11 has an assembly surface 12 assembled and connected to the tailstock body, and the bottom of the assembly cavity 11 has a seat bottom wall 13. The cylinder bodies of the first oil cylinder 21 and the second oil cylinder 22 are arranged in the assembly cavity 11 and are fastened to the seat bottom wall 13. The two oil cylinders are installed together in a larger cavity, which can facilitate the installation and assembly of the oil cylinders and the piston connecting rod 24.

[0020] A through hole 14 is provided on the seat bottom wall 13 corresponding to the piston rods of the first oil cylinder 21 and the second oil cylinder 22, and a locking plate 23 is provided below the seat bottom wall 13. The piston rods of the first oil cylinder 21 and the second oil cylinder 22 pass through the through hole 14 and are fixedly connected to the locking plate 23. In this embodiment, a fastening hole 231 is provided on the locking plate 23 and the piston rods of the two oil cylinders, and a fastening bolt 232 is fastened to the fastening hole 231 to fix the locking plate 23 on the locking side of the piston rods of the two oil cylinders. When the first oil cylinder 21 and the second oil cylinder 22 act synchronously, the locking plate 23 is pulled by the two piston rods to lock and fix the tailstock to the guide rail. The setting structure of the locking plate 23 is simple and stable, and is not easy to loosen and fall off.

[0021] The other end of the piston rod of the first cylinder 21 and the second cylinder 22, that is, the end of the piston rod away from the locking pressure plate 23, constitutes a non-locking side, and the piston rods of the two cylinders are connected on the non-locking side by a piston connecting rod 24 made of rigid material, so that the piston rods of the two cylinders form an integrated piston rod structure. When one of the first cylinder 21 and the second cylinder 22 fails to lock due to long-term oil leakage due to problems with the sealing ring structure, the other cylinder can maintain the stability of its piston rod position due to normal operation, and then the piston rod of the failed cylinder can also maintain a stable position through the pulling of the piston connecting rod 24 made of rigid material; in the event of failure of one of the two cylinders, the effectiveness of the entire locking structure can be maintained, thereby improving the cylinder locking reliability of the hydraulic locking structure 2.

[0022] In this embodiment, the piston connecting rod 24 is a block, and countersunk holes 241 are set at both ends of the piston connecting rod 24 corresponding to the piston rods of the two oil cylinders. Countersunk bolts 242 are connected to the countersunk holes 241 and the piston rods of the oil cylinders. The piston connecting rod 24 is fixedly connected to the non-locking sides of the piston rods of the two oil cylinders by bolt fastening. The setting structure of the piston connecting rod 24 is simple. In other embodiments, the piston connecting rod 24 can also be connected to the oil cylinder piston rod by conventional fixed structures such as welding and interference fit assembly, or the piston connecting rod 24 is in the form of a plate.

[0023] As an improved embodiment, the piston connecting rod 24 can also be composed of two symmetrically arranged half-connecting rods 25 that are assembled and connected. The ends of the half-connecting rods 25 are provided with matching clamping grooves 26. The ends of the two half-connecting rods 25 are matched with each other to clamp the non-locking sides of the piston rods of the first cylinder 21 and the second cylinder 22 through the matching clamping grooves 26. The two half-connecting rods 25 are then fastened together so that the two half-connecting rods 25 are firmly connected to the non-locking sides of the piston rods of the two cylinders. The structural form of providing countersunk holes 241 at the relative ends of the piston connecting rod 24 when it is assembled and fixed can avoid the trouble of aligning and adjusting the countersunk holes 241 and the non-locking sides of the cylinder piston rods, and the assembly is relatively faster.

[0024] When implementing it, Figure 5As shown in the figure, screw holes 27 are correspondingly arranged on the two half connecting rods 25, and bolts are locked and connected to the screw holes 27 so that the two half connecting rods 25 are assembled and fixed on the non-locking side of the piston rods of the two oil cylinders; or as Figure 6 As shown in the figure, connecting holes 28 are correspondingly arranged on the two half connecting rods 25, and the bolt and nut assemblies are assembled and connected to the connecting holes 28 so that the two half connecting rods 25 are assembled and fixed on the non-locking side of the piston rods of the two oil cylinders; or as Figure 7 As shown, a connecting hole 28 is provided on one of the half connecting rods 25, and a connecting rod 29 is provided on the other half connecting rod 25. A locking thread is provided on the end of the connecting rod 29. The connecting rod 29 is inserted into the connecting hole 28 so that the two half connecting rods 25 are assembled and connected to the connecting rod 29 through a nut to fix the two half connecting rods 25 on the non-locking side of the piston rods of the two oil cylinders.

[0025] For those skilled in the art, various other corresponding changes and modifications can be made according to the technical solutions and concepts described above, and all of these changes and modifications should fall within the protection scope of the claims of the utility model.

Claims

1. A tailstock hydraulic locking structure, comprising two oil cylinders (21, 22) mounted on a base (1), wherein the locking side of the piston rods of the oil cylinders (21, 22) is connected to a locking pressure plate (23) arranged below the base (1), characterized in that: The non-locking sides of the piston rods of the oil cylinders (21, 22) are connected by a rigid connecting piece, and when the piston rod of one of the two oil cylinders (21, 22) fails due to oil leakage, the rigid connecting piece is used to maintain the position of the piston rod of the oil leakage failure cylinder.

2. The tailstock hydraulic locking structure according to claim 1, characterized in that: The two ends of the rigid connection piece are fixedly connected to the non-locking sides of the piston rods of the two oil cylinders (21, 22) by means of bolts.

3. The tailstock hydraulic locking structure according to claim 2, characterized in that: The rigid connecting member is a block-shaped connecting rod.

4. The tailstock hydraulic locking structure according to claim 3, characterized in that: Countersunk holes (241) are provided at both ends of the rigid connecting member corresponding to the non-locking sides of the piston rods of the two oil cylinders (21, 22), and countersunk bolts (242) are connected to the countersunk holes (241) and the non-locking sides of the piston rods of the oil cylinders (21, 22).

5. The tailstock hydraulic locking structure according to claim 1, characterized in that: The rigid connecting member is composed of two symmetrically arranged half connecting rods (25) assembled and connected, and the ends of the two half connecting rods (25) are provided with matching clamping grooves (26) for clamping the non-locking sides of the piston rods of the two oil cylinders (21, 22).

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