Swivel joint of the tool release cylinder of the broach mechanism

Abstract

The invention discloses a rotary joint of a knife loosening cylinder of a broach mechanism, comprising a housing, a tail cover shaft of the knife loosening cylinder, a clamping spacer, a rotary joint cap and a plurality of high-speed sealing rings, as well as high-speed bearings, sealing ring glands, bearing caps and axial O-rings arranged in pairs. The central axis of the tail cover shaft of the knife loosening cylinder passes through the central through hole of the housing, and its two ends are supported in the housing by high-speed bearings respectively. The first oil port of the knife loosening cylinder and the second oil port of the knife loosening cylinder are respectively vertically connected to the first oil channel of the knife loosening cylinder and the second oil channel of the knife loosening cylinder in the central shaft. Several high-speed sealing rings are sleeved on the middle part of the central shaft, and are respectively located on both sides of the first oil port of the knife loosening cylinder and the second oil port of the knife loosening cylinder. The invention has a compact structure and is convenient and quick to install and maintain. The temperature of the high-speed bearing is reduced and the thermal deformation of the seal is reduced, so that the leakage of the hydraulic oil in the housing is effectively avoided, and the reliability of the invention is improved.

Description

Technical Field

[0001] The invention relates to a joint device for connecting a rotary cylinder, in particular to a rotary joint for connecting a high-speed rotating knife loosening cylinder of a broach mechanism, and belongs to the technical field of hydraulic accessories. Background Art

[0002] Horizontal machining centers are frequently used for high-speed cutting, and their average spindle speed is 2500rpm. The loosening cylinder of the broaching mechanism installed in the center hole of the spindle also rotates at high speed with the spindle. Long-term high-speed cutting causes the rotary joint seal of the loosening cylinder to be severely worn and fail, resulting in frequent oil leakage of the rotary joint. The oil pressure of the loosening cylinder drops and the knife cannot be loosened in time. At this time, the machine must be stopped to replace the seal. Replacing the rotary joint seal is time-consuming and labor-intensive, which seriously affects the cutting efficiency and the oil leakage pollutes the surrounding environment. In addition, due to the high spindle speed, it is easy to cause the bearing of the rotary joint to lock, damage the broaching mechanism and even damage the horizontal machining center. Summary of the invention

[0003] The purpose of the present invention is to provide a knife loosening oil cylinder rotary joint of a knife broaching mechanism, so as to prolong the service life of the rotary joint and improve the working reliability of the knife broaching mechanism.

[0004] The present invention is achieved through the following technical solutions:

[0005] A rotary joint of a knife loosening cylinder of a broach mechanism, comprising a housing, a knife loosening cylinder tail cover shaft, a clamping spacer, a rotary joint cap and a plurality of high-speed sealing rings, as well as high-speed bearings, sealing ring glands, bearing caps and axial O-rings arranged in pairs, wherein the knife loosening cylinder tail cover shaft comprises a knife loosening cylinder tail cover and a central shaft horizontally extending outward from the center of the knife loosening cylinder tail cover, and both ends of the central shaft passing through the central through hole of the housing are respectively supported in the housing by high-speed bearings; a sealing ring gland is respectively arranged on one side of the high-speed bearing facing the center of the housing, and is sealed by an axial O-ring A bearing cap is provided on the side of the high-speed bearing away from the center of the shell; a first oil port of the knife loosening cylinder and a second oil port of the knife loosening cylinder are respectively provided on both sides of the shell, and the first oil port of the knife loosening cylinder and the second oil port of the knife loosening cylinder are respectively vertically connected with the first oil channel of the knife loosening cylinder and the second oil channel of the knife loosening cylinder in the center shaft through annular oil grooves at corresponding positions on the center shaft; several high-speed sealing rings are sleeved on the middle part of the center shaft; a clamping spacer is sleeved on one end of the center shaft, and two ends of the clamping spacer are respectively against one side of the high-speed bearing at the outer end of the center shaft and one side of the rotary joint cap screwed on the end of the center shaft.

[0006] The purpose of the present invention is achieved in the first step by the following technical scheme:

[0007] Furthermore, radial O-rings are respectively embedded in radial grooves on the outer peripheral surface of the sealing ring gland.

[0008] Furthermore, two high-speed sealing rings are sleeved in pairs back to back on the middle of the central shaft, and high-speed sealing rings are respectively provided on both sides of the first oil port of the knife loosening cylinder and the second oil port of the knife loosening cylinder.

[0009] Furthermore, the high-speed bearing is a high-speed deep groove ball bearing with a clearance of C3. The high-speed sealing ring is a QTBH-I series high-speed sealing ring.

[0010] The present invention has a compact structure, does not require major changes to the original spindle mechanism of the machine tool, and is quick and easy to maintain. The annular oil groove, two-way oil port and oil channel structure of the present invention are convenient for collecting oil, and the circulation of hydraulic oil can be used to remove the heat generated by the high-speed bearing when the tail cover shaft of the tool loosening cylinder rotates at high speed, thereby reducing the temperature of the high-speed bearing and the thermal deformation of the seal, thereby improving the reliability of the present invention. High-speed sealing rings are respectively arranged on both sides of the oil port to effectively avoid the leakage of hydraulic oil in the housing. The use of high-speed deep groove ball bearings with a clearance of C3 prolongs the service life of the high-speed bearing under high-speed and high-temperature conditions, reduces maintenance costs, and improves the work efficiency of high-speed cutting.

[0011] BRIEF DESCRIPTION OF THE DRAWINGS The advantages and features of the present invention will be illustrated and explained by the following non-limiting description of preferred embodiments thereof, which are given by way of example only with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a cross-sectional view of the present invention. DETAILED DESCRIPTION

[0013] The present invention will be further described below with reference to the accompanying drawings and an embodiment of the SM 50PSTA / 2400 type broach mechanism.

[0014] like Figure 1 As shown, this embodiment includes a housing 1, a tail cover shaft of a knife loosening oil cylinder 2, a clamping spacer 3, a rotary joint cap 4 and four high-speed sealing rings 5, as well as high-speed bearings 6, sealing ring glands 7, bearing caps 8, axial O-rings 9 and radial O-rings 10 arranged in pairs. The tail cover shaft 2 of the knife loosening oil cylinder includes a tail cover 21 of the knife loosening oil cylinder and a central shaft 22 extending horizontally outward from the center of the tail cover 21 of the knife loosening oil cylinder. Both ends of the central shaft 22 passing through the central through hole 11 of the housing are supported in the housing 1 by high-speed bearings 6. The high-speed bearing 6 of this embodiment uses a high-speed deep groove ball bearing 6006ZZ with a large clearance C3, and a maximum speed of 13000rpm, which is much greater than the maximum speed of 6000rpm of the spindle of the horizontal machining center.

[0015] The high-speed bearing 6 is provided with a sealing ring gland 7 on the side facing the center of the housing 1, and is sealed by an axial O-ring 9, and a radial O-ring 10 is respectively embedded in a radial groove 71 on the outer peripheral surface of the sealing ring gland 7. O-rings are provided in both the axial and radial directions of the sealing ring gland 7, which improves the static sealing effect of the sealing ring gland 7 and avoids leakage of hydraulic oil. The high-speed bearing 6 is provided with a bearing cap 8 on the side away from the center of the housing 1, and the axial position of the high-speed bearing 6 is adjusted by adjusting the gasket 81, so that the high-speed bearing 6 can be accurately positioned in the axial direction.

[0016] The first oil port 12 and the second oil port 13 of the knife loosening cylinder are respectively provided on both sides of the housing 1. The first oil port 12 and the second oil port 13 of the knife loosening cylinder are respectively vertically connected to the first oil passage 222 and the second oil passage 223 of the knife loosening cylinder in the center shaft 22 through the annular oil groove 221 at the corresponding position on the center shaft 22. Such a structure can ensure that the 6MPa high-pressure oil in the oil inlet pipe passes through the first oil port 12 of the knife loosening cylinder on the stationary housing 1, and then enters the first oil passage 222 of the knife loosening cylinder through the annular oil groove 221 corresponding to the high-speed rotating center shaft 22 to push the knife loosening cylinder piston to move to realize the knife loosening action. The return oil of the knife loosening cylinder passes through the second oil passage 223 of the knife loosening cylinder through the annular oil groove 221, and then returns to the return oil pipe through the second oil port 13 of the knife loosening cylinder. The middle position function of the hydraulic reversing valve in the hydraulic circuit of the knife releasing cylinder is H-type, which can ensure that when the hydraulic reversing valve is in the H-type middle position function during the non-knife releasing period, the two oil ports and the oil inlet port and the oil return port of the knife releasing cylinder are in a floating state that is interconnected. The hydraulic oil pumped out by the hydraulic pump returns to the hydraulic oil tank after passing through the H-type middle position of the hydraulic reversing valve, thereby realizing the circulation function of the hydraulic oil, reducing the oil temperature of the hydraulic oil and reducing energy consumption.

[0017] Four high-speed seal rings 5 ​​are sleeved on the middle of the center shaft 22. The high-speed seal ring 5 is a QTBH-I type combined high-speed seal ring, which can withstand a linear speed of 15m / min and an axial pressure of 20MPa, meeting the linear speed and pressure requirements of the horizontal machining center and achieving the requirement of long service life. Two high-speed seal rings 5 ​​are sleeved in pairs back to back on the middle of the center shaft 22, and high-speed seal rings 5 ​​are respectively provided on both sides of the first oil port 12 and the second oil port 13 of the knife loosening cylinder, thereby providing a reliable dynamic seal for the first oil channel 222 and the second oil channel 223 of the knife loosening cylinder of the high-speed rotating center shaft 22.

[0018] The clamping sleeve 3 is sleeved on the right end of the central shaft 22, and the two ends of the clamping sleeve 3 respectively abut against the right side of the high-speed bearing 6 at the outer end of the central shaft 22 and the left side of the rotating joint cap 4 screwed on the end of the central shaft 22, so that the high-speed bearing 6 can be reliably positioned.

[0019] In addition to the above embodiments, the present invention may also have other implementation modes. Any technical solutions formed by equivalent replacement or equivalent transformation shall fall within the protection scope required by the present invention.

Claims

1. A rotary joint of a loosening cylinder of a broach mechanism, comprising a shell and a loosening cylinder tail cover shaft, as well as high-speed bearings, sealing ring glands, bearing caps and axial O-rings arranged in pairs, wherein the loosening cylinder tail cover shaft comprises a loosening cylinder tail cover and a central axis horizontally extending outward from the center of the loosening cylinder tail cover, and both ends of the central axis passing through the central through hole of the shell are supported in the shell by high-speed bearings respectively; the high-speed bearings are respectively provided with sealing ring glands on the side facing the center of the shell, and are sealed by axial O-rings, and the high-speed bearings are provided with bearing caps on the side facing away from the center of the shell; the first oil port of the loosening cylinder and the second oil port of the loosening cylinder are respectively provided on both sides of the shell, and the first oil port of the loosening cylinder and the second oil port of the loosening cylinder are respectively vertically connected to the first oil channel of the loosening cylinder and the second oil channel of the loosening cylinder in the central shaft through annular oil grooves at corresponding positions on the central shaft; characterized in that It also includes a clamping sleeve, a rotary joint cap and several high-speed sealing rings, which are sleeved on the middle part of the central shaft; the clamping sleeve is sleeved on one end of the central shaft, and the two ends of the clamping sleeve are respectively against one side of the high-speed bearing at the outer end of the central shaft and one side of the rotary joint cap screwed on the end of the central shaft; the radial O-rings are respectively embedded in the radial grooves on the outer peripheral surface of the sealing ring gland; two high-speed sealing rings are sleeved in pairs back to back on the middle part of the central shaft, and high-speed sealing rings are respectively provided on both sides of the first oil port of the knife loosening cylinder and the second oil port of the knife loosening cylinder; the high-speed bearing uses a high-speed deep groove ball bearing with a clearance of C3; the high-speed sealing ring is a QTBH-I series high-speed sealing ring.

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