Double-shaft precise sliding table cylinder

Abstract

The double-shaft precision sliding table cylinder comprises a base body, a cylinder body and a piston structure, the base body comprises a bottom plate and a vertical plate, the cylinder body is connected with the bottom plate in a sliding mode, a piston cavity is formed in the cylinder body, 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 of the piston rod is fixed to the piston body. The other end of the piston enters the piston cavity and is connected with the piston body, a tolerance gap is formed between the piston and the piston rod, and the piston is fixed to the piston rod through a correction sealing ring. Due to the arrangement of the tolerance clearance and the correction sealing ring, the piston rod can elastically float relative to the piston body, and therefore if acting force with lateral components is applied to the force application end, abrasion caused by the fact that the acting force directly acts on a cylinder body through the piston is avoided, and the service life of the piston structure is not affected.

Description

Technical Field

[0001] The invention relates to a mechanical component, and more particularly to a double-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 drives the dual piston rods through compressed air 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 and high-flow hydraulic components, which achieve mechanical energy output through air pressure conversion in the hydraulic system, and have micron-level positioning accuracy and excellent load stability. The traditional piston structure has significant defects: when the piston rod and the piston are mechanically fastened by the rotary riveting process, it is easy to cause seal failure (leakage) or deformation of the seal groove due to uneven riveting force; the riveting process may cause microscopic deformation of the piston rod (hidden damage), greatly reducing the life of the cylinder; in addition, the process requires multiple processing and testing procedures, which is inefficient and costly. These problems restrict the reliability performance of the slide cylinder 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 double-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 slidably 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 through a correction sealing ring.

[0005] Further: the piston rod has a first rod body and a second rod body, the first rod body is formed with a yield section at one end 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 arranged on the cylinder body, and the piston rod is connected to the cylinder body through the circulating ball bearing.

[0008] Further: A plurality of correction holes are provided at the bottom of the cylinder block. Each correction hole is threadedly connected with a correction bolt. The bottom plate is provided with an interface hole for taking out or installing the correction bolt into the correction hole.

[0009] Further: When the correction screw is fixed in 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] Further: Each piston rod corresponds to at least 5 correction holes, and the distance between adjacent correction holes is equal.

[0011] Further: The cylinder block is provided with two independent piston chambers. Correspondingly, the piston structure is provided with two.

[0012] Further: A positioning photosensitive array is provided at the bottom of the cylinder block. 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 positioning photosensitive array. When the positioning photosensitive array receives the infrared light, a deviation position signal is generated.

[0013] The technical effects of the present invention are mainly reflected in the following aspects: By setting like this, the setting of the tolerance gap and 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 at the force application end, it will not directly act on the cylinder block through the piston to cause wear and affect the service life of the piston structure. Description of the Drawings

[0014] Figure 1 : The external axonometric view of a double-axis precision slide cylinder of the present invention; Figure 2 : The partial sectional schematic diagram of a double-axis precision slide cylinder of the present invention; Figure 3 : The sectional side view of a double-axis precision slide cylinder of the present invention; Figure 4 : The top view of a double-axis precision slide cylinder of the present invention.

[0015] Reference numerals: 100, seat body; 110, bottom plate; 111, correction bolt; 112, correction hole; 113, correction seal cavity; 114, calibration hole; 120, vertical plate; 121, accommodation clamping groove; 200, cylinder block; 201, piston cavity; 210, circulating ball bearing; 211, first bearing seal ring; 212, second bearing seal ring; 221, infrared ray light source; 222, alignment photosensitive array; 300, piston structure; 310, first rod body; 311, fixed bolt groove; 312, relief section; 313, thread groove; 320, second rod body; 321, sealing section; 322, threaded rod; 330, piston body; 331, limiting flange; 332, fixed ring groove; 340, rod body fixing head; 341, rod body ring groove; 343, fixed screw; 343, step groove; 301, tolerance gap; 302, mating accommodation groove; 303, correction seal ring. Detailed implementation mode

[0016] The following further details the specific implementation mode of the present invention in conjunction with the attached drawings, so that the technical solution of the present invention is easier to understand and master.

[0017] Refer to Figures 1-4 As shown, a double-axis precision slide cylinder: includes a seat body, a cylinder block and a piston structure. The seat body includes a bottom plate and a vertical plate. The cylinder block is slidably connected to the floor and a piston cavity is formed inside the cylinder block. The piston structure includes a piston rod and a piston body. Refer to Figures 2-3 , one end of the piston rod is fixed to the vertical plate, 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 cylinder block is provided with two independent piston cavities. Correspondingly, the piston structure is provided with two. Specifically, the vertical plate and the bottom plate are fixed by bolts. An accommodation clamping groove is formed on the vertical plate. The end of the piston rod is provided with a rod body fixing head. The rod body fixing head is provided with a rod body ring groove. By clamping the rod body ring groove and the accommodation clamping groove, at the same time, the rod body fixing head is provided with a fixed screw. A fixed bolt groove is formed on the first rod body. The first rod body and the rod body fixing head are fixed by matching the fixed screw and the fixed bolt groove. In order to make the fixing effect better, a step groove is formed on the rod body fixing head for accommodating the end of the first rod body. In this way, relatively speaking, the rod body is restricted and fixed in four directions. The radial movement is restricted by the bearing and the piston body, and at the same time, it is fixed by the rod body fixing head.

[0018] The piston rod has a first rod body and a second rod body, wherein the first rod body has a clearance section formed at one end 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 clearance 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. The first rod body and the second rod body are connected by threads. Specifically, the second rod body is provided with a threaded rod, which can be fixed by cooperating with the thread groove on the first rod body. During the fixing process, the first rod body and the second rod body cooperate with each other to form a clamping connection relationship with the limiting flange part 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 10-20 threads, that is, the tolerance gap allows the piston rod to float radially relative to the piston body. Since other positions are rigidly connected or connected through a sealing ring, when the piston rod is subjected to force and has a radial component, this component will be transmitted to the correction sealing ring, and the correction of this component will be completed by the radial deformation of the correction sealing ring, so that this force will not continue to be transmitted to the piston body, so that the friction between the piston body and the piston cavity wall affects the sealing of the piston structure and thus affects the service life. It should be noted that there is no way to make each component accurately matched through processing, so the purpose of centering correction is achieved by reserving a tolerance gap and buffering the correction sealing ring. At the same time, this setting can ensure that the two chambers are still in a sealed state during the movement of the piston to complete the piston movement.

[0019] Reference Figures 2-3 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. The first bearing sealing ring and the second bearing sealing ring of the circulating ball bearing are respectively sealed with the piston rod and the cylinder body.

[0020] In another embodiment, due to this design, under the self-gravity of the piston rod, it is easy to squeeze and correct the sealing ring itself, which may easily cause fatigue deformation of the correction sealing ring, resulting in a slight downward offset of the first rod body. The present invention aims to solve this problem. A plurality of correction holes are provided at the bottom of the cylinder block, and each correction hole is threadedly connected with a correction bolt. The bottom plate is provided with an interface hole for taking out or installing the correction bolt into the correction hole. By adjusting the tightness of the correction hole, when the correction screw is fixed in the correction hole, a correction sealing cavity is formed between the correction bolt and the correction hole. The end of the correction bolt is provided with a lithium sulfide-based electrolyte layer. A conductive part is formed inside the correction bolt and a conductive contact is formed at the bottom of the correction bolt. With such a setting, gas can be released after being electrified, thus... Each piston rod corresponds to at least 5 correction holes, and the distance between adjacent correction holes is equal. Through the design of the correction holes, the inclination degree of the cylinder block can be finely adjusted. If the fixed stroke of the threaded holes is completely consistent in theory, then at least theoretically the cylinder block should be parallel to the bottom plate. However, if the tightness of the threaded holes is inconsistent, it may be slightly inclined. Due to process reasons, whether it is inclined now depends on the installation effect and the thread accuracy. At present, it is very common to have a slight inclination caused by process errors. The setting of the present invention aims to finely adjust under this accuracy, so as to avoid the influence on the service life caused by the slight downward offset of the first rod body. The principle is as follows: Each correction screw and the correction screw hole are in a mating relationship. However, due to errors, there will be a gap between the bolt and the screw hole. However, as a whole, due to the large number of threads, the overall space still has a high degree of sealing. If gas is generated in the internal space, expansion will occur, that is, a reverse thrust is applied to the screw from the cavity, thus completing the further tightening and sealing of the bolt during the tightening process. At the same time, the tightening degree of the bolt is also finely adjusted. If the bolts are arranged in an array, theoretically, inconsistent tightening degrees of the bolts will cause the entire cylinder block to be inclined relative to the bottom plate. Since the piston body and the cylinder block are sealed and fixed, the piston body will be inclined, so that the inclination of the first rod body can be corrected and the service life can be improved, and the deviation can be further corrected. Therefore, during continuous use, the tightening force is increased and finely adjusted by generating gas in the correction hole, so that the thread is tightened, and the inclination is formed to complete the balance of the micro data of the structure. Since if a higher-precision adjustment is required, a deviation data output is needed. A positioning photosensitive array is provided at the bottom of the cylinder block, and an infrared ray light source is provided on the piston body. When the infrared ray light source is electrified, it emits infrared light to the positioning photosensitive array. When the positioning photosensitive array receives the infrared light, a deviation position signal is generated.Infrared light is sent through the photosensitive array to the corresponding feedback to achieve the feedback of the deviation position. Because 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 through the output of the position signal, and then each correction bolt can be controlled to make corrections. It should be noted that during the entire correction process, the sliding table needs to move. Therefore, three calibration holes are provided on the base plate. By setting the three calibration holes, three correction bolts can be simultaneously controlled to release gas to increase the internal pressure. The three calibration holes can also manually tighten or loosen the correction bolts.

[0021] In another embodiment, the correction bolt is hollow inside. After the bolt is tightened through the calibration hole, structural adhesive can also be filled. The structural adhesive generates reverse pressure through excessive extrusion to improve the fixing effect. When the structural adhesive needs to be adjusted, the external heating wire is used to heat and melt the structural adhesive, and then the amount of the structural adhesive is adjusted, so as to adjust the slight inclination degree of the entire cylinder block.

[0022] The operation steps of the calibration method are as follows: S1. Connect to 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 according to the deviation signal; S3. Adjust the correction holes in turn from the direction of the piston rod to the piston body until the corresponding deviation signal falls within the range defined by the adjustment amount target.

[0023] The first implementation method: During installation, the correction bolt is threadedly connected to the correction hole of the cylinder block through the interface hole on the base plate, so that the end lithium sulfide-based electrolyte layer of the correction bolt faces the cylinder block direction, and the conductive contact is connected to the external circuit. When in use, connect to the power supply, the conductive part conducts to release gas from the electrolyte layer, form an expansion force in the correction seal cavity, and finely adjust the inclination degree of the cylinder block through thread fit. According to the deviation position signal fed back by the alignment photosensitive array, adjust each correction bolt in turn from the direction of the piston rod to the piston body until the deviation signal falls within the target range, and use the gas expansion force to realize the fine adjustment of the bolt tightening degree and the correction of the cylinder block inclination.

[0024] The second implementation method: During installation, first screw the correction bolt into the correction hole through the interface hole to a predetermined position, and inject structural adhesive into the hollow correction bolt through the calibration hole. The structural adhesive generates reverse pressure through excessive extrusion to enhance the fixing effect. When the inclination amount of the cylinder block needs to be adjusted during use, heat the structural adhesive with an external heating wire to melt it, and adjust the tightening degree of each correction bolt from the calibration hole according to the deviation adjustment amount target generated by the alignment photosensitive array to change the structural adhesive filling amount. After cooling, the structural adhesive solidifies to fix the position of the cylinder block, realizing the fine adjustment of the inclination.

[0025] Example 1: Gas expansion fine adjustment correction method Application scenario: A double-axis sliding table cylinder on a precision electronic component assembly line, with a required positioning accuracy of ±5μm and an initial horizontal deviation of the cylinder block of ±15μm.

[0026] Specific data: The single piston rod corresponds to 5 correction holes, which are distributed in a straight line array, and the distance between adjacent holes is 20 mm; The pitch of the correction bolt is 0.5 mm, and the single adjustment amount is 0.002 mm / turn (corresponding to a cylinder block tilt change of 0.0005°); After the lithium sulfide-based electrolyte layer is energized, the released gas pressure ranges from 0.1 to 0.3 MPa, and a bolt micro-displacement of 0.001 mm can be generated for every 10 kPa pressure change; The detection accuracy of the alignment photosensitive array is 0.1 μm, and the feedback period is 100 ms.

[0027] Operation process: In the initial state, the infrared light source emits a signal to the photosensitive array, and it is detected that the right side of the cylinder block is offset by 12 μm; The system generates adjustment targets: the right correction bolts need to be finely adjusted upward by 0.004 mm, 0.005 mm, 0.006 mm (corresponding to 2, 2.5, 3 turns), and the left bolts remain stationary; Starting from the first correction bolt close to the piston rod, the 3 bolts on the right side are energized in sequence, applying a voltage of 0.2 MPa, and each bolt is energized in 3 pulses (each energization is 50 ms, with an interval of 200 ms) to make the bolt move slightly upward; After adjusting each bolt, wait for 100 ms for the gas pressure to stabilize, and detect the deviation again until the final offset is reduced to 3 μm, meeting the accuracy requirements.

[0028] Example 2: Structural adhesive filling correction method: Application scenario: Precision slide cylinder for medical devices, requiring long-term stable accuracy of ±0.001°, and the initial tilt of the cylinder block is 0.02° (vertical deviation of 0.035 mm / 100 mm length).

[0029] Specific data: The correction bolt uses the M3×0.5 specification, with a hollow inner diameter of 1.5 mm, and the structural adhesive filling amount per hole is 50 mg; The heating wire power is 5 W, the heating temperature is 80 °C (the melting temperature of the structural adhesive is 65 °C), and the cooling and curing time is 30 minutes; Conversion of the screw-in depth of the bolt and the tilt angle: Each screw-in of 1 turn (0.5 mm) can correct a tilt of 0.003°; The alignment photosensitive array converts the angular deviation into a linear displacement signal, and 1° corresponds to 2000 μm.

[0030] Operation process: It is detected that the cylinder block is tilted backward by 0.018° (corresponding to a linear deviation of 36 μm), and it needs to be corrected forward by 0.015°; Heat the 3 rear correction bolts to 80°C to melt the structural adhesive, and turn the bolts counterclockwise (turn each bolt 2 turns, a total of 0.1 mm × 2 = 0.2 mm) to lift the front end of the cylinder block; Re-inject the structural adhesive (increase the filling amount by 20 mg per hole), and cool and cure for 30 minutes; The deviation of the second detection is reduced to 0.004°. For the remaining deviation of 0.001°, fine repair is completed by slightly screwing in a single bolt at the front end (0.5 turns, 0.25 mm), and the final deviation is stabilized within the range of ±0.0008°.

[0031] Of course, the above are only typical examples of the present invention. In addition, the present invention can also have many other specific implementation manners. Any technical solutions formed by equivalent replacement or equivalent transformation fall within the scope of protection required by the present invention.

Claims

1. A double-axis precision slide cylinder, characterized in that: It includes a seat body, a cylinder body and a piston structure, the seat body includes a bottom plate and a vertical plate, the cylinder body is slidably connected to the bottom plate 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 through a correction sealing ring.

2. The double-axis precision slide cylinder according to claim 1, characterized in that: The piston rod has a first rod body and a second rod body, wherein the first rod body is formed with a yield section at one end 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.

3. The double-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. A dual-axis precision slide cylinder as claimed in claim 1, wherein: 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. A double-axis precision slide cylinder according to claim 1, characterized in that: The bottom of the cylinder body is provided with a plurality of correction holes, each of which 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.

6. The double-axis precision slide cylinder according to claim 5, 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.

7. The double-axis precision slide cylinder according to claim 6, characterized in that: Each piston rod has at least 5 correction holes correspondingly, and the intervals between adjacent correction holes are equal.

8. A double-axis precision slide cylinder as described in claim 1, characterized in that: The cylinder body is provided with two independent piston chambers, and correspondingly, the piston structure is provided with two.

9. A double-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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