A mechatronic pressure medium spring anti-backlash kit

Abstract

The present invention belongs to the technical field of mechanical parts, and discloses a mechatronic pressure medium spring clearance elimination kit, including an inner ring; an outer ring is sleeved on the inner ring and fixedly connected with the inner ring, and an annular cavity is formed between the inner ring and the outer ring; a piston is inserted in the cavity, and a first pressure cavity is formed between the piston, the outer ring and the inner ring; an end face sealing pressure ring is sleeved on the piston and fixed on the outer ring, and a second pressure cavity is formed between the end face sealing pressure ring, the piston and the outer ring, and the end face sealing pressure ring is fixedly connected with the outer ring; a first pressure control component is connected with the first pressure cavity, and a second pressure control component is connected with the second pressure cavity. The present invention can eliminate the reverse transmission gap and improve the transmission accuracy of the single nut ball screw. The pressure in the first pressure cavity and the second pressure cavity can be adjusted in real time through the control system according to the load condition to appropriately increase or reduce the rigidity of the single nut ball screw transmission pair, so that its wear is greatly reduced and the service life is increased.

Description

Technical Field

[0001] The invention relates to the technical field of mechanical parts, and in particular to a mechatronic pressure medium spring clearance elimination kit. Background Art

[0002] In the currently widely used high-end precision CNC machine tools, in order to eliminate the reverse clearance that affects the transmission accuracy of the screw-nut pair, the precision ball screw pair with a double-nut structure is one of the most frequently used main precision functional components. With its good precision characteristics and long-term use, it almost occupies most of the market for precision transmission functional components. However, there is a fatal flaw in the double-nut structure currently used. In order to eliminate the reverse clearance, the double-nut screw pair is achieved by adjusting the thickness of the gasket between the double nuts. When the gasket thickness is too large, the load on the screw will be increased, accelerating the wear of the screw. When the gasket thickness is too small, the reverse clearance cannot be completely eliminated, resulting in reduced transmission accuracy. Therefore, when a new screw leaves the factory, it is necessary to grind it with the gasket, which is time-consuming and labor-intensive. Moreover, since only a certain section of the screw stroke is often used after the new screw product is installed, after a period of use, the frequently used section is severely worn. The reverse clearance of the ball screw in this section of the stroke where the full stroke cannot be guaranteed to be evenly used will inevitably be greater than the reverse clearance of the section that is not frequently used. At this time, neither mechanical methods nor electrical methods can currently achieve complete compensation for the different reverse clearances on the same screw. Therefore, it is inevitable that certain adverse and currently uneliminable effects will be caused to the transmission accuracy of the ball screw pair. Once the above-mentioned excessive "uneven wear" phenomenon occurs in a certain section of the screw's travel, the entire machine tool transmission part needs to be disassembled, the screw needs to be taken out and replaced as a whole, which brings high maintenance costs. Summary of the invention

[0003] The present invention provides a mechatronic pressure medium spring clearance elimination kit to overcome the problems existing in the above-mentioned prior art.

[0004] The technical solution of the present invention is:

[0005] A mechatronic pressure medium spring anti-backlash kit, comprising:

[0006] Inner ring;

[0007] An outer ring, which is sleeved on the inner ring and fixedly connected to the inner ring, and an annular cavity is formed between the inner ring and the outer ring;

[0008] A piston is inserted in the cavity, and a first pressure chamber is formed between the piston, the outer ring and the inner ring;

[0009] An end face sealing pressure ring is sleeved on the piston, a second pressure chamber is formed between the end face sealing pressure ring, the piston and the outer ring, and the end face sealing pressure ring is fixedly connected to the outer ring;

[0010] A first pressure control assembly is communicated with the first pressure chamber and is used to inject or discharge the pressure medium into the first pressure chamber to push the piston to move;

[0011] The second pressure control assembly is communicated with the second pressure chamber and is used to inject or discharge the pressure medium into the second pressure chamber to push the piston to move.

[0012] Preferably, it also includes:

[0013] A connecting sleeve is sleeved on the end of the piston away from the inner ring, and the connecting sleeve is fixedly connected to the piston.

[0014] Preferably, the first pressure control component includes a first channel opened on the outer ring, one end of the first channel is connected to the first pressure chamber, and the other end is provided with a first plug; it also includes a first interface, which is provided on the end surface of the outer ring, one end of which is connected to the first channel, and the other end is connected to an external first pressure medium source, and a first pressure adjustment system for adjusting the pressure of the medium in the first pressure chamber is provided between the first pressure medium source and the first interface.

[0015] Preferably, the second pressure control component includes a second channel opened on the outer ring, one end of the second channel is connected to the second pressure chamber, and the other end is provided with a second plug; it also includes a second interface, which is provided on the end surface of the outer ring, one end of which is connected to the second channel, and the other end is connected to an external second pressure medium source, and a second pressure adjustment system for adjusting the pressure of the medium in the first pressure chamber is provided between the second pressure medium source and the second interface.

[0016] Preferably, the first pressure adjustment system and the second pressure adjustment system have the same structure, the first pressure adjustment system includes a pressure sensor arranged on the first pressure chamber, the pressure sensor is connected to the external controller signal, the controller is electrically connected to the control valve on the first pressure medium source, and the controller is electrically connected to the power supply through the control switch.

[0017] Preferably, the first pressure adjustment system includes an electro-hydraulic proportional overflow valve having one end connected to the outlet of the first pressure medium source, the other end of the electro-hydraulic proportional overflow valve is connected to one end of the reversing valve, the other end of the reversing valve is connected to the first interface, the electro-hydraulic proportional overflow valve is also electrically connected to a signal amplifier, the signal amplifier is connected to the signal of an external controller, and the controller is electrically connected to the power supply through a control switch.

[0018] Preferably, sealing structures are provided between the inner ring and the outer ring, between the inner ring and the piston, and between the piston and the outer ring.

[0019] Preferably, a retaining ring is provided between the end face sealing pressure ring and the piston, and the retaining ring is sleeved on the piston.

[0020] The present invention is connected to a nut in a single-nut ball screw mechanism. When in use, by adjusting the pressure in the first pressure chamber and the second pressure chamber, the ball in the nut can always be pressed to one side of its sliding direction. Therefore, when the screw moves in the opposite direction, the control system can make the nut move along the axial direction of the screw or perform spiral movement along the spiral raceway of the screw before the screw drives it to move, while ensuring that the screw transmission position remains unchanged. This can achieve bidirectional gapless transmission of the single-nut ball screw transmission pair and eliminate the reverse clearance in the single-nut ball screw transmission pair.

[0021] Compared with the prior art, the electromechanical integrated pressure medium spring clearance elimination kit provided by the present invention has the following beneficial effects:

[0022] 1. The present invention can completely eliminate the reverse transmission gap at different reverse points, and with the pitch error compensation function of the numerical control system itself, it can greatly improve the transmission accuracy of the single-nut ball screw of ordinary accuracy level;

[0023] 2. The pressure in the first pressure chamber and the second pressure chamber of the present invention can be adjusted in real time through the control system according to the load conditions to appropriately increase or decrease the rigidity of the single-nut ball screw transmission pair, thereby greatly reducing its wear and prolonging its service life. It is highly practical and worthy of popularization and use. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is the overall structure diagram of the present invention;

[0025] Figure 2 It is a left side view of the present invention;

[0026] Figure 3 It is a schematic diagram of the use state of the present invention.

[0027] Description of reference numerals:

[0028] 1. Inner ring; 2. Outer ring; 3. First interface; 4. First plug; 5. Piston; 6. Retaining ring; 7. End face sealing pressure ring; 8. First connecting piece; 9. Connecting sleeve; 10. Nut; 11. Screw; 12. Second connecting piece; 13. First sealing ring; 14. Second sealing ring; 15. Second pressure chamber; 16. Second interface; 17. Second plug; 18. Third sealing ring; 19. Fourth sealing ring; 20. Second interface; 21. First pressure chamber; 22. Fifth sealing ring; 23. Third connecting piece; 24. Ball. DETAILED DESCRIPTION

[0029] The following is combined with the attached drawings Figures 1 to 3 , a specific embodiment of the present invention is described in detail, but it should be understood that the protection scope of the present invention is not limited by the specific embodiment.

[0030] Example 1

[0031] like Figure 1 As shown, a mechatronic pressure medium spring anti-backlash kit includes an inner ring 1, an outer ring 2, a piston 5 and an end face sealing pressure ring 7, wherein the outer ring 2 is sleeved on the inner ring 1, and an annular cavity is formed between the inner ring 1 and the outer ring 2.

[0032] like Figure 1 and Figure 2 As shown, a flange structure is provided on one side of the inner ring 1 , and a plurality of through holes for connection are opened on the flange structure. A third connecting member 23 for fixedly connecting the outer ring 2 and the inner ring 1 is passed through the through holes.

[0033] Preferably, the third connecting member 23 can be selected as a screw.

[0034] One end of the piston 5 is inserted into the cavity, and a first pressure chamber 21 is formed between the piston 5 , the outer ring 2 and the inner ring 1 . The piston 5 can slide relative to the inner ring 1 and the outer ring 2 .

[0035] The first pressure chamber 21 is connected to a first pressure control component, which is used to inject or discharge pressure medium into the first pressure chamber 21, thereby pushing the piston 5 to slide between the inner ring 1 and the outer ring 2 through the pressure medium in the first pressure chamber 21.

[0036] An end face sealing ring 7 is mounted on the piston 5 and is slidingly and sealingly connected to the piston 5. An annular table with a diameter smaller than that of the piston 5 is provided on the outer circumference of the piston 5, thereby forming a second pressure chamber 15 between the end face sealing ring 7, the piston 5 and the outer ring 2.

[0037] Among them, the end face sealing pressure ring 7 is fixedly connected to the outer ring 2 by screws or bolts, or a connecting thread can be opened on the inner side of the outer ring 2, and the end face sealing pressure ring 7 is installed on the inner side of the outer ring 2 and fixedly connected to the outer ring 2 by threads.

[0038] The second pressure chamber 15 is connected to a second pressure control assembly for injecting or discharging pressure medium into or out of the second pressure chamber 15 , thereby pushing the piston 5 to slide between the inner ring 1 and the outer ring 2 through the pressure medium in the second pressure chamber 15 .

[0039] Specifically, the first pressure control component includes a first channel opened on the outer ring 2, one end of the first channel is connected to the first pressure chamber 21, and the other end is provided with a first plug 4; it also includes a first interface 3, which is arranged on the end face of the outer ring 2, one end of which is connected to the first channel, and the other end is connected to an external first pressure medium source, and a first pressure adjustment system for adjusting the pressure of the medium in the first pressure chamber 21 is provided between the first pressure medium source and the first interface 3.

[0040] Specifically, the second pressure control component includes a second channel opened on the outer ring 2, one end of the second channel is connected to the second pressure chamber 15, and the other end is provided with a second plug 17; it also includes a second interface 20, which is arranged on the end face of the outer ring 2, one end of which is connected to the second channel, and the other end is connected to an external second pressure medium source, and a second pressure adjustment system for adjusting the pressure of the medium in the first pressure chamber 21 is provided between the second pressure medium source and the second interface 20.

[0041] The first pressure regulating system and the second pressure regulating system have the same structure and are used to control the pressure of the pressure medium in the first pressure chamber 21 and the second pressure chamber 15 .

[0042] The first pressure adjustment system includes a pressure sensor arranged on the first pressure chamber 21, the pressure sensor is connected to the external controller signal, the controller is electrically connected to the control valve on the first pressure medium source, and the controller is electrically connected to the power supply through the control switch.

[0043] During use, the pressure of the pressure medium is measured by the pressure sensor, and the measured pressure value is uploaded to the controller for processing. When the measured pressure value is equal to the preset pressure value, the controller issues a control instruction to close the control valve on the first pressure medium source and stop supplying pressure medium to the first pressure chamber 21.

[0044] In use, such as Figure 3As shown, one end of the piston 5 can be fixedly connected to the nut 10 on the screw-nut mechanism. When the piston 5 moves, the nut 10 can be driven to move synchronously, or the screw nut can be rotated along the screw spiral raceway, and a force is applied to the ball 24 inside the nut 10, so that the ball 24 is always pressed on one side of its sliding direction. Therefore, when the screw moves in the opposite direction, the control system can make the nut 10 move along the axial direction of the screw or perform spiral motion along the screw spiral raceway before the screw drives it to move, while ensuring that the screw transmission position remains unchanged. This can realize bidirectional gapless transmission of the single-nut ball screw transmission pair, and eliminate the reverse clearance in the single-nut ball screw transmission pair.

[0045] Example 2

[0046] As an alternative scheme based on Example 1, another implementation scheme of the pressure adjustment system is given, wherein the first pressure adjustment system includes an electro-hydraulic proportional overflow valve having one end connected to the outlet of the first pressure medium source, the other end of the electro-hydraulic proportional overflow valve is connected to one end of the reversing valve, the other end of the reversing valve is connected to the first interface 3, the electro-hydraulic proportional overflow valve is also electrically connected to a signal amplifier, the signal amplifier is connected to the signal of an external controller, and the controller is electrically connected to the power supply through a control switch.

[0047] During use, the pressure of the pressure medium is limited by the electro-hydraulic proportional relief valve.

[0048] Example 3

[0049] As a further preferred solution based on Example 1, in order to achieve sealing, a retaining ring 6 is provided between the end face sealing pressure ring 7 and the piston 5, and the retaining ring 6 is sleeved on the piston 5. Sealing structures are provided between the inner ring 1 and the outer ring 2, between the inner ring 1 and the piston 5, and between the piston 5 and the outer ring 2.

[0050] Preferably, the sealing structures are all selected as sealing rings.

[0051] Specifically, a fifth sealing ring 22 is provided between the inner ring 1 and the outer ring 2 , a fourth sealing ring 19 and a first sealing ring 13 are provided between the inner ring 1 and the piston 5 , and a third sealing ring 18 is provided between the piston 5 and the outer ring 2 .

[0052] Example 4

[0053] As a further preferred solution based on Example 1, in order to better realize the connection between the device provided by the present invention and the nut 10 and improve the reliability of the connection, as shown in FIG. Figure 3 As shown, a connecting sleeve 9 is provided, which is sleeved on the end of the piston 5 away from the inner ring 1 , and the connecting sleeve 9 is fixedly connected to the piston 5 via a first connecting piece 8 , and the connecting sleeve 9 is fixedly connected to the nut 10 via a second connecting piece 12 .

[0054] Preferably, the first connecting member 8 may be a top screw, and the second connecting member 12 may be a bolt.

[0055] The present invention provides a mechatronic pressure medium spring clearance elimination kit, which can change the position of the piston 5 by injecting pressure media of different pressures into the first pressure chamber 21 and the second pressure chamber 15 .

[0056] Working principle of the present invention:

[0057] like Figure 3 As shown, the pressure medium spring kit of the present invention is placed on the side of the installation position of the original nut 10, and then the second connecting member 12 and the first connecting member 8 are used to fix the connecting sleeve 9 with the original nut 10 and one end of the piston 5. When a pressure medium with a certain pressure is injected into the first pressure chamber 21 through the first pressure control component, the piston 5 will push the nut 10 to Figure 3 The nut 10 will push the ball 24 to the right side of the lead screw raceway. If the pressure in the first pressure chamber 21 is greater than the pressure in the second pressure chamber 15, and the lead screw does not move, the nut 10 will continue to move along the lead screw spiral raceway until the pressures in the first pressure chamber 21 and the second pressure chamber 15 are equal or the piston moves to the end of the stroke, and then it stops moving. Figure 3 It can be seen that at this time, if an external force such as a driving motor drives the lead screw to rotate, Figure 3 When the raceway section shown in the figure moves to the left, the ball screw raceway pushes the nut 10 to move to the left at the same time through the ball, which is a gapless transmission; when the screw moves in the reverse direction, the external force drives the screw to rotate so that Figure 1 In the millisecond-level micro-period before the raceway cross section shown in the figure moves to the right, the first pressure adjustment system and the second pressure adjustment system are used to adjust the pressure of the pressure medium in the first pressure chamber 21 and the second pressure chamber 15, so that the pressure in the second pressure chamber 15 is greater than the pressure in the first pressure chamber 21, and the piston 5 will push the nut 10 along the axial direction of the screw or along the spiral raceway of the screw. Figure 3 The nut 10 will push the ball 24 to the left side of the screw raceway, and the nut 10 will push the ball 24 to the left side of the screw raceway. Figure 3 The principle is the same as shown. When the pressure in the first pressure chamber 21 and the second pressure chamber 15 are the same, or when the piston reaches the end of its stroke, the nut 10 stops moving, and the transmission is also gapless.

[0058] Compared with the prior art, the present invention provides a mechatronic pressure medium spring clearance eliminating kit, which can drive the lead screw nut connected thereto to slide along the axial direction of the lead screw and to perform spiral motion along the spiral raceway of the lead screw by adjusting the pressure in the first pressure chamber and the second pressure chamber. Therefore, when the lead screw moves in the opposite direction, the control system can make the nut move along the axial direction of the lead screw or to perform spiral motion along the spiral raceway of the lead screw before the lead screw drives it to move, while ensuring that the transmission position of the lead screw remains unchanged. This kit has high practicality and is worthy of promotion.

[0059] The above disclosures are only several specific embodiments of the present invention. However, the embodiments of the present invention are not limited thereto. Any changes that can be conceived by those skilled in the art should fall within the protection scope of the present invention.

Claims

1. A mechatronic pressure medium spring anti-backlash kit, characterized in that: include: Inner loop (1); An outer ring (2) is sleeved on the inner ring (1) and fixedly connected to the inner ring (1), so that an annular cavity is formed between the inner ring (1) and the outer ring (2); A piston (5) is inserted into the cavity and is slidably connected to the inner ring (1) and the outer ring (2); a first pressure chamber (21) is formed between one end of the piston (5), the outer ring (2) and the inner ring (1); An end face sealing pressure ring (7) is sleeved on the other end of the piston (5) and fixed on the outer ring, a second pressure chamber (15) is formed between the end face sealing pressure ring (7), the piston (5) and the outer ring (2), and the end face sealing pressure ring (7) is fixedly connected to the outer ring (2); A first pressure control assembly, connected to the first pressure chamber (21), and used to inject or discharge pressure medium into or out of the first pressure chamber (21), thereby pushing the piston (5) to move; A second pressure control assembly is communicated with the second pressure chamber (15) and is used to inject or discharge pressure medium into or out of the second pressure chamber (15) to push the piston (5) to move; and further includes: A connecting sleeve (9) is sleeved on an end of the piston (5) facing away from the inner ring (1), and the connecting sleeve (9) is fixedly connected to the piston (5); The first pressure control component comprises a first channel opened on the outer ring (2), one end of the first channel being in communication with the first pressure chamber (21), and the other end being provided with a first plug (4); and further comprises a first interface (3) arranged on the outer surface of the outer ring (2), one end of the first channel being in communication with the first channel, and the other end being in communication with an external first pressure medium source, and a first pressure adjustment system for adjusting the pressure of the medium in the first pressure chamber (21) being provided between the first pressure medium source and the first interface (3); The second pressure control component comprises a second channel opened on the outer ring (2), one end of the second channel being connected to the second pressure chamber (15), and the other end being provided with a second plug (17); and further comprises a second interface (20) provided on the outer surface of the outer ring (2), one end of the second channel being connected to the second channel, and the other end being connected to an external second pressure medium source, and a second pressure adjustment system for adjusting the pressure of the medium in the first pressure chamber (21) being provided between the second pressure medium source and the second interface (20).

2. The mechatronic pressure medium spring anti-backlash kit according to claim 1, characterized in that: The first pressure adjustment system and the second pressure adjustment system have the same structure. The first pressure adjustment system comprises a pressure sensor arranged on the first pressure chamber (21). The pressure sensor is connected to a signal of an external controller. The controller is electrically connected to a control valve on the first pressure medium source. The controller is electrically connected to a power supply via a control switch.

3. The mechatronic pressure medium spring anti-backlash kit according to claim 2, characterized in that: The first pressure adjustment system comprises an electro-hydraulic proportional overflow valve having one end connected to the outlet of a first pressure medium source, the other end of the electro-hydraulic proportional overflow valve being connected to one end of a reversing valve, the other end of the reversing valve being connected to the first interface (3), the electro-hydraulic proportional overflow valve being also electrically connected to a signal amplifier, the signal amplifier being connected to a signal of an external controller, and the controller being electrically connected to a power supply via a control switch.

4. The mechatronic pressure medium spring anti-backlash kit according to claim 1, characterized in that: Sealing structures are provided between the inner ring (1) and the outer ring (2), between the inner ring (1) and the piston (5), and between the piston (5) and the outer ring (2).

5. The mechatronic pressure medium spring anti-backlash kit according to claim 1, characterized in that: A retaining ring (6) is provided between the end face sealing pressure ring (7) and the piston (5), and the retaining ring (6) is sleeved on the piston (5).

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