A dual-axis precision slide cylinder

Abstract

The present invention relates to a dual-axis precision slide cylinder, comprising a base, a cylinder body, and a piston structure, wherein the base comprises a bottom plate and a vertical plate, the cylinder body and the bottom plate are slidably connected, and a piston cavity is formed inside the cylinder body, and the piston structure comprises a piston rod and a piston body, one end of the piston rod is fixed to the vertical plate, and the other end enters the piston cavity and is connected to the piston body, a tolerance gap is formed between the piston and the piston rod, and the piston is fixed to the piston rod by a correction sealing ring. The setting of the tolerance gap and the correction sealing ring can make the piston rod elastically float relative to the piston body, so that if a force with a lateral component is applied to the force-applying end, it will not directly act on the cylinder body through the piston to cause wear, thereby affecting the service life of the piston structure.

Description

Technical Field

[0001] The present invention relates to mechanical components, and more particularly to a dual-axis precision slide cylinder. Background Art

[0002] The dual-axis precision slide cylinder is a precision drive device that integrates linear guides and pneumatic actuators. It uses compressed air to drive dual piston rods to achieve high-precision linear motion and is widely used in automated assembly lines, medical device manufacturing and other fields. Its core components include high-pressure, high-flow hydraulic elements, which achieve mechanical energy output through air pressure conversion in the hydraulic system, with micron-level positioning accuracy and excellent load stability. The traditional piston structure has significant defects: when the piston rod and piston are mechanically fastened using a rotary riveting process, uneven riveting force can easily lead to seal failure (air leakage) or deformation of the sealing groove; the riveting process may cause microscopic deformation of the piston rod (hidden damage), significantly reducing the life of the cylinder; in addition, the process requires multiple processing and testing steps, which is inefficient and costly. These problems restrict the reliability performance of slide cylinders in precision industrial scenarios. Summary of the Invention

[0003] In view of this, an object of the present invention is to provide a dual-axis precision slide cylinder.

[0004] In order to solve the above technical problems, the technical solution of the present invention is: a dual-axis precision sliding cylinder: including a base body, a cylinder body and a piston structure, the base body including a base plate and a vertical plate, the cylinder body and the base plate are slidingly connected and a piston cavity is formed inside the cylinder body, the piston structure includes a piston rod and a piston body, one end of the piston rod is fixed to the vertical plate, and the other end enters the piston cavity and is connected to the piston body, a tolerance gap is formed between the piston and the piston rod, and the piston is fixed to the piston rod by a correction sealing ring.

[0005] Furthermore: the piston rod includes a first rod body and a second rod body, a yield section is formed on one end of the first rod body close to the piston body, a limiting flange is formed on the piston body, and a sealing section is formed on the second rod body. When the piston body and the piston rod are fixed, the yield section and the sealing section cooperate to form a matching accommodating groove for accommodating the limiting flange, and a fixing ring groove is formed on the limiting flange, and the fixing ring groove is used to accommodate the correction sealing ring.

[0006] Furthermore: the first rod body and the second rod body are connected by threads.

[0007] Furthermore: a circulating ball bearing is provided on the cylinder body, and the piston rod is connected to the cylinder body through the circulating ball bearing.

[0008] Furthermore: a plurality of correction holes are provided at the bottom of the cylinder body, each correction hole is threadedly connected with a correction bolt, and the bottom plate is provided with an interface hole for taking out or installing the correction bolt to the correction hole.

[0009] Furthermore: when the correction screw is fixed to the correction hole, a correction sealing cavity is formed between the correction bolt and the correction hole, a lithium sulfide-based electrolyte layer is provided at the end of the correction bolt, a conductive part is formed inside the correction bolt and a conductive contact is formed at the bottom of the correction bolt.

[0010] Furthermore: each piston rod corresponds to at least 5 correction holes, and the intervals between adjacent correction holes are equal.

[0011] Furthermore: the cylinder body is provided with two independent piston chambers, and correspondingly, the piston structures are provided in two.

[0012] Furthermore: a positioning photosensitive array is provided at the bottom of the cylinder body, and an infrared light source is provided on the piston body. When the infrared light source is powered on, it emits infrared light to the positioning photosensitive array, and the positioning photosensitive array generates a deviation position signal when receiving the infrared light.

[0013] The technical effects of the present invention are mainly reflected in the following aspects: through such a setting, the tolerance gap and the setting of the correction sealing ring can make the piston rod elastically float relative to the piston body. In this way, if a force with a lateral component is applied to the force-applying end, it will not directly act on the cylinder body through the piston to cause wear, thereby affecting the service life of the piston structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 : Axonometric view of a dual-axis precision slide cylinder according to the present invention;

[0015] Figure 2 : A partial cross-sectional schematic diagram of a dual-axis precision slide cylinder of the present invention;

[0016] Figure 3 : A sectional side view of a dual-axis precision slide cylinder of the present invention;

[0017] Figure 4 : A top view of a dual-axis precision slide cylinder of the present invention.

[0018] Reference numerals: 100, seat; 110, bottom plate; 111, correction bolt; 112, correction hole; 113, correction sealing chamber; 114, calibration hole; 120, vertical plate; 121, receiving and snapping groove; 200, cylinder body; 201, piston chamber; 210, circulating ball bearing; 211, first bearing sealing ring; 212, second bearing sealing ring; 221, infrared ray light source; 222, alignment photosensitive array; 300, piston structure; 3 10. First rod body; 311. Fixing bolt groove; 312. Giving way section; 313. Threaded groove; 320. Second rod body; 321. Sealing section; 322. Threaded rod; 330. Piston body; 331. Limiting flange; 332. Fixing ring groove; 340. Rod body fixing head; 341. Rod body ring groove; 343. Fixing screw; 343. Step groove; 301. Tolerance gap; 302. Matching accommodating groove; 303. Correction sealing ring. DETAILED DESCRIPTION

[0019] The specific embodiments of the present invention are further described below in conjunction with the accompanying drawings to make the technical solutions of the present invention easier to understand and grasp.

[0020] Reference Figure 1-4 As shown, a dual-axis precision slide cylinder includes a base, a cylinder and a piston structure. The base includes a bottom plate and a vertical plate. The cylinder and the bottom plate are slidably connected and a piston cavity is formed inside the cylinder. The piston structure includes a piston rod and a piston body. Figure 2-3 One end of the piston rod is fixed to the vertical plate, and the other end enters the piston cavity and is connected to the piston body. A tolerance gap is formed between the piston and the piston rod, and the piston is fixed to the piston rod by a correction seal. The cylinder body is provided with two independent piston cavities, and correspondingly, the piston structure is provided with two. Specifically, the vertical plate and the bottom plate are fixed by bolts, and a receiving clamping groove is formed on the vertical plate. The end of the piston rod is provided with a rod body fixing head, and the rod body fixing head is provided with a rod body ring groove. At the same time, the rod body ring groove and the receiving clamping groove are clamped together, and the rod body fixing head is provided with a fixing screw. A fixing bolt groove is formed on the first rod body. The first rod body is fixed to the rod body fixing head by the combination of the fixing screw and the fixing bolt groove. In order to achieve a better fixing effect, a step groove is formed on the rod body fixing head to accommodate the end of the first rod body. In this way, relative to the rod body, it is restricted and fixed in all four directions. The radial movement is restricted by the bearing and the piston body, and it is also fixed by the rod body fixing head.

[0021] The piston rod includes a first rod body and a second rod body. The first rod body has a clearance section formed at one end near the piston body. The piston body has a limit flange formed on the second rod body. When the piston body and piston rod are fixed, the clearance section and the sealing section cooperate to form a matching accommodating groove for accommodating the limit flange. The limit flange has a fixing ring groove formed on the fixing ring groove for accommodating the correction sealing ring. The first and second rod bodies are connected by threads. Specifically, the second rod body is provided with a threaded rod, which cooperates with the threaded groove on the first rod body to achieve fixation. During the fixation process, the first and second rod bodies cooperate with each other to form a clamping connection with the limiting flange portion of the piston body, and a tolerance gap is formed relative to the radial direction of the rod body. The tolerance gap is preferably between 10 and 20 threads. In other words, the tolerance gap allows the piston rod to float radially relative to the piston body. Since other parts are rigidly connected or connected through sealing rings, when the piston rod is subjected to a radial force component, this component will be transmitted to the correction seal ring, and the correction seal ring will correct this component through radial deformation. In this way, this force will not continue to be transmitted to the piston body, causing friction between the piston body and the piston cavity wall, affecting the sealing performance of the piston structure and thus shortening its service life. It should be noted that it is impossible to achieve a very accurate and precise fit of each component through machining, so the tolerance gap is reserved and the correction seal ring is used as a buffer to achieve the purpose of centering correction. At the same time, this arrangement ensures that the two chambers remain sealed during the piston movement, completing the piston movement.

[0022] Reference Figure 2-3 The cylinder body is provided with a recirculating ball bearing, and the piston rod is connected to the cylinder body through the recirculating ball bearing. The first bearing sealing ring and the second bearing sealing ring provided in the recirculating ball bearing respectively achieve sealing with the piston rod and the cylinder body.

[0023] In another embodiment, because of this design, the piston rod itself is prone to squeezing the correction seal ring under its own weight, which causes the correction seal ring to be prone to fatigue deformation, and causes the first rod body to be prone to slight downward displacement. The present invention is to solve this problem. The bottom of the cylinder body is provided with a plurality of correction holes, each correction hole is threadedly connected to a correction bolt, and the bottom plate is provided with an interface hole for removing or installing the correction bolt to the correction hole. By adjusting the tightness of the correction hole, when the correction screw is fixed to the correction hole, a correction sealing cavity is formed between the correction bolt and the correction hole, and a lithium sulfide-based electrolyte layer is provided at the end of the correction bolt, a conductive part is formed inside the correction bolt, and a conductive contact is formed at the bottom of the correction bolt. Through such an arrangement, gas can be released after power is applied, thereby. Each piston rod corresponds to at least 5 correction holes, and the spacing between adjacent correction holes is equal. By designing the correction hole, the degree of inclination of the cylinder body can be fine-tuned. If the fixed stroke of the threaded hole is completely consistent in theory, then at least in theory the cylinder body should be parallel to the base plate. However, if the tightness of the threaded hole is inconsistent, it may be slightly tilted. Due to process reasons, whether it is tilted now depends on the installation effect and thread accuracy. At present, slight tilting caused by process errors is very common. The setting of the present invention is intended to perform fine-tuning at this accuracy, so that the service life of the first rod body is affected by the slight downward offset. The principle is as follows: each correction screw and correction screw hole are in a matching relationship, but due to errors, This will result in a gap between the bolt and the screw hole, but overall, due to the large number of threads, the overall space remains highly sealed. If gas is generated in the internal space, it will expand, which in turn applies thrust from the cavity back to the screw, thus further compressing and sealing the bolt during tightening, while also fine-tuning the tightening degree of the bolt. If the bolts are arranged in an array, theoretically, inconsistent tightening of the bolts will cause the entire cylinder to tilt relative to the base plate. Since the piston body and cylinder body are sealed and fixed, this will cause the piston body to tilt, thus correcting the tilt of the first rod body, improving service life and further correcting deviation. Therefore, during continuous use, by generating gas in the correction hole to increase the tightening force and fine-tune the screw thread, the tilt is formed to achieve structural micro-data balance. Since more precise adjustment is required, deviation data output is required. The bottom of the cylinder body is provided with a positioning photosensitive array, and the piston body is provided with an infrared light source. When energized, the infrared light source emits infrared light to the positioning photosensitive array, and the positioning photosensitive array generates a deviation position signal when receiving the infrared light.The feedback of the deviation position is realized by sending infrared light to the corresponding feedback through the photosensitive array. If the first rod body deviates, the position signal output by the photosensitive array will change. In this way, the deviation amount can be judged by the output of the position signal, and correction can be made by controlling each correction bolt. It should be noted that the slide needs to move during the entire correction process, so three calibration holes are set on the bottom plate. Through the setting of the three calibration holes, the three correction bolts can be controlled to release gas at the same time to increase the internal pressure. The three calibration holes can also be used to manually tighten or loosen the correction bolts.

[0024] In another embodiment, the hollow interior of the bolt is corrected, and after the bolt is tightened through the calibration hole, it can also be filled with structural adhesive. The structural adhesive generates reverse pressure through excessive extrusion to improve the fixing effect. When the structural adhesive needs to be adjusted, the structural adhesive is heated and melted by an external heating wire, and then the amount of the structural adhesive is adjusted, thereby achieving the effect of adjusting the slight tilt degree of the entire cylinder body.

[0025] At the same time, the operating steps of the calibration method are as follows: S1. Connect the external power supply to turn on the infrared photosensitive array to receive the deviation signal; S2. Generate the adjustment amount target for each correction hole based on the deviation signal; S3. Adjust the correction holes in sequence from the piston rod to the piston body until the corresponding deviation signal falls within the range defined by the adjustment amount target.

[0026] The first implementation method involves threading a correction bolt into the cylinder body's correction hole through the baseplate interface hole during installation, with the lithium sulfide-based electrolyte layer at the bolt's end facing the cylinder body, and the conductive contact connected to an external circuit. When connected to a power source, the conductive portion conducts, causing the electrolyte layer to release gas, generating an expansion force within the correction seal chamber. This allows the threaded connection to fine-tune the cylinder body's tilt. Based on the deviation position signal fed back by the alignment photosensitive array, each correction bolt is adjusted sequentially from the piston rod to the piston body until the deviation signal falls within the target range. This gas expansion force is then used to fine-tune the bolt tightening and correct the cylinder body's tilt.

[0027] The second method involves screwing the correction bolts through the interface holes into the correction holes to the desired position. Structural adhesive is then injected into the hollow correction bolts through the calibration holes. Excessive compression of the adhesive creates reverse pressure, enhancing the securing effect. During use, the cylinder tilt needs to be adjusted. External heating wires heat the adhesive to melt it. Based on the deviation adjustment target generated by the alignment photosensitive array, the tightening of each correction bolt through the calibration holes changes the adhesive filling level. After cooling, the adhesive solidifies and secures the cylinder position, achieving micro-tilt correction.

[0028] Example 1: Gas Expansion Fine-Tuning Correction Method

[0029] Application scenario: Double-axis slide cylinder for precision electronic component assembly line, requiring positioning accuracy of ±5μm and initial horizontal deviation of the cylinder body of ±15μm.

[0030] Specific data:

[0031] A single piston rod corresponds to 5 correction holes, which are distributed in a linear array, with a spacing of 20mm between adjacent holes;

[0032] Correction bolt pitch 0.5mm, single adjustment amount 0.002mm / turn (corresponding to cylinder tilt change 0.0005°);

[0033] When the lithium sulfide-based electrolyte layer is energized, the gas pressure released ranges from 0.1 to 0.3 MPa. Every 10 kPa pressure change can produce a 0.001 mm bolt micro-displacement.

[0034] The detection accuracy of the alignment photosensitive array is 0.1μm, and the feedback cycle is 100ms.

[0035] Operation process:

[0036] In the initial state, the infrared light source transmits a signal to the photosensitive array, which detects that the cylinder body is offset to the right by 12 μm;

[0037] The system generates adjustment targets: the right correction bolt needs to be fine-tuned upward by 0.004mm, 0.005mm, and 0.006mm (corresponding to 2, 2.5, and 3 turns), while the left bolt remains stationary.

[0038] Starting from the first correction bolt close to the piston rod, energize the three bolts on the right side in sequence, apply 0.2MPa voltage, and pulse each bolt three times (50ms each time, 200ms interval), so that the bolt moves up slightly;

[0039] After adjusting each bolt, wait 100ms for the gas pressure to stabilize and then check the deviation again until the final offset is reduced to 3μm, meeting the accuracy requirements.

[0040] Example 2: Structural adhesive filling correction method: Application scenario: Precision slide cylinder for medical equipment, requiring long-term stable accuracy of ±0.001°, and initial cylinder tilt of 0.02° (vertical deviation 0.035mm / 100mm length).

[0041] Specific data:

[0042] The correction bolts are of M3×0.5 specification, with a hollow inner diameter of 1.5mm and a structural adhesive filling amount of 50mg per hole;

[0043] Heating wire power 5W, heating temperature 80℃ (structural adhesive melting temperature 65℃), cooling and curing time 30 minutes;

[0044] Conversion between bolt screw-in depth and tilt angle: Each screw-in turn (0.5mm) can correct the tilt by 0.003°;

[0045] The alignment photosensitive array converts the angular deviation into a linear displacement signal, with 1° corresponding to 2000μm.

[0046] Operation process:

[0047] The test found that the cylinder body was tilted 0.018° backward (corresponding to a linear deviation of 36μm), and a correction of 0.015° forward was required;

[0048] Heat the three rear correction bolts to 80°C to melt the structural adhesive, and unscrew the bolts counterclockwise (unscrew each bolt 2 turns, a total of 0.1mm×2=0.2mm) to lift the front end of the cylinder body;

[0049] Re-inject structural glue (add 20 mg filling amount per hole) and cool and solidify for 30 minutes;

[0050] The secondary inspection deviation was reduced to 0.004°. For the remaining 0.001° deviation, fine-tuning was completed by slightly screwing in a single bolt at the front end (0.5 turns, 0.25mm). The final deviation was stabilized within the range of ±0.0008°.

[0051] Of course, the above are only typical examples of the present invention. In addition, the present invention may also have many other specific implementation methods. Any technical solutions formed by equivalent replacement or equivalent transformation fall within the scope of protection required by the present invention.

Claims

1. A dual-axis precision slide cylinder, characterized by: The base comprises a base, a cylinder and a piston structure. The base comprises a bottom plate and a vertical plate. The cylinder is slidably connected to the bottom plate and a piston cavity is formed inside the cylinder. The piston structure comprises a piston rod and a piston body. One end of the piston rod is fixed to the vertical plate, and the other end enters the piston cavity and is connected to the piston body. A tolerance gap is formed between the piston and the piston rod. The piston is fixed to the piston rod through a correction seal ring. The bottom of the cylinder body is provided with a plurality of correction holes, each correction hole is threadedly connected with a correction bolt, and the bottom plate is provided with an interface hole for taking out or installing the correction bolt to the correction hole.

2. The dual-axis precision slide cylinder according to claim 1, characterized in that: The piston rod includes a first rod body and a second rod body. A yield section is formed on one end of the first rod body close to the piston body. A limiting flange is formed on the piston body. A sealing section is formed on the second rod body. When the piston body and the piston rod are fixed, the yield section and the sealing section cooperate to form a matching accommodating groove for accommodating the limiting flange. A fixing ring groove is formed on the limiting flange, and the fixing ring groove is used to accommodate the correction sealing ring.

3. The dual-axis precision slide cylinder according to claim 2, characterized in that: The first rod body and the second rod body are connected by threads.

4. The dual-axis precision slide cylinder according to claim 1, characterized in that: The cylinder body is provided with a circulating ball bearing, and the piston rod is connected to the cylinder body through the circulating ball bearing.

5. The dual-axis precision slide cylinder according to claim 1, characterized in that: When the correction screw is fixed to the correction hole, a correction sealing cavity is formed between the correction bolt and the correction hole, a lithium sulfide-based electrolyte layer is provided at the end of the correction bolt, a conductive part is formed inside the correction bolt and a conductive contact is formed at the bottom of the correction bolt.

6. The dual-axis precision slide cylinder according to claim 5, characterized in that: Each piston rod has at least five correction holes, and the spacing between adjacent correction holes is equal.

7. The dual-axis precision slide cylinder according to claim 1, characterized in that: The cylinder body is provided with two independent piston chambers, and correspondingly, the number of the piston structures is set to two.

8. The dual-axis precision slide cylinder according to claim 1, characterized in that: The bottom of the cylinder body is provided with an alignment photosensitive array, and the piston body is provided with an infrared ray light source. When the infrared ray light source is powered on, it emits infrared light to the alignment photosensitive array, and the alignment photosensitive array generates a deviation position signal when receiving the infrared light.

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