Laser cladding equipment for vacuum pump body

Abstract

The present invention relates to a laser cladding device for a vacuum pump body, belonging to the technical field of laser cladding equipment. The present invention includes a frame, a positioning member, a cladding assembly, a rotation drive mechanism, and a vertical feed mechanism. The positioning member includes a positioning platform and a positioning protrusion arranged on the top surface of the positioning platform. The positioning protrusion includes two circular segments. The cladding assembly is provided with two groups spaced apart from left to right, including a sleeve and a cladding head connected to the bottom end of the sleeve. The two sleeves in the two groups of cladding assemblies are respectively coaxial with the two circular segments in the positioning protrusion. The rotation drive mechanism is mounted on the frame and is used to drive the sleeves in the two groups of cladding assemblies to rotate alternately in the form of one circle forward and one circle reverse around their own axes. The vertical feed mechanism is mounted on the frame and is used to drive the two groups of cladding assemblies to move up or down a set distance after each circle. The present invention can improve the efficiency of laser cladding processing of the pump body of a spiral vacuum pump.

Description

Technical Field

[0001] The present invention relates to the technical field of laser cladding equipment, and in particular to laser cladding equipment for a vacuum pump body. Background Art

[0002] A vacuum pump is a device used to extract gas molecules from a closed system, creating a partial or complete vacuum. They are widely used in a variety of fields, including industrial manufacturing, scientific research, medical equipment, and laboratories. Vacuum pumps can be divided into several types based on their operating principles and technical parameters, each with its own specific application scenarios and advantages.

[0003] A screw vacuum pump is a highly efficient dry vacuum pump that utilizes a pair of intermeshing screw rotors to compress and exhaust air, thereby creating a vacuum environment. Screw vacuum pumps are widely used due to their high efficiency and low maintenance requirements. The pump body of a screw vacuum pump is the core of the entire device. It not only supports one or more pairs of intermeshing screw rotors but also forms a sealed working chamber, ensuring that gas can be effectively compressed and exhausted.

[0004] The design and manufacturing quality of the inner wall of the screw vacuum pump directly affects the sealing, durability and overall performance of the pump. In order to improve the surface quality of the inner wall of the screw vacuum pump, laser cladding is usually used to clad a layer of coating with specific properties on the inner wall of the pump body.

[0005] The pump body of a screw vacuum pump usually includes two cylindrical inner cavities with overlapping parts. In the existing technology, when laser cladding is performed on the surface or inner hole of a cylindrical part, since the rear end of the laser cladding head is usually connected to multiple pipes for conveying protective gas and metal powder, the rotation of the laser cladding head will cause the rear end pipe lines to become entangled. Therefore, the part is generally driven to rotate and the laser cladding head is driven to move along the axial direction of the part to perform laser cladding on the part surface.

[0006] For example, the patent with authorization announcement number CN116575024B discloses a laser cladding equipment for metal surface modification, which includes a frame, a three-jaw chuck and a laser cladding equipment body. A three-jaw chuck and a locking rod are respectively provided on both sides of the upper end of the frame. The side of the locking rod is connected to the electric push rod. A moving mechanism is provided inside the table of the frame, and a robotic arm is provided on the outside of the moving mechanism. The laser cladding equipment body is provided at one end of the robotic arm. When the equipment is in use, the moving mechanism drives the robotic arm to move, thereby driving the laser cladding equipment body to move along the axis of the cylindrical workpiece. The three-jaw chuck clamps the cylindrical workpiece and drives the cylindrical workpiece to rotate, finally completing the laser cladding of the surface of the cylindrical workpiece.

[0007] However, if the above-mentioned method of driving the laser cladding equipment to move along the axial direction of the cylindrical workpiece and driving the cylindrical workpiece to rotate is used to process the pump body of the screw vacuum pump, since the pump body of the screw vacuum pump has two cylindrical inner cavities, the rotation axis of the pump body of the screw vacuum pump needs to be switched during the processing. In this way, the clamping state of the pump body needs to be adjusted during the processing. Since the pump body is heavy, the adjustment will consume more manpower and time, affecting the processing efficiency. Summary of the Invention

[0008] The present invention provides a laser cladding device for a vacuum pump body to solve the technical problem in the prior art that when performing laser cladding processing on the inner wall of the pump body of a screw vacuum pump, the clamping state of the pump body needs to be adjusted, which consumes a lot of manpower and time and affects the processing efficiency.

[0009] To solve the above problems, the present invention provides a vacuum pump body laser cladding equipment adopting the following technical solutions:

[0010] A laser cladding device for a vacuum pump body, comprising:

[0011] The rack also includes:

[0012] The positioning member is horizontally arranged on the frame, and includes a positioning platform and a positioning protrusion arranged on the top surface of the positioning platform. The positioning protrusion includes two circular segments with overlapping portions. The positioning protrusion is adapted to be inserted into the bottom end of the pump body, and the top surface of the positioning platform is used for the bottom surface of the pump body to abut against.

[0013] There are two sets of cladding components spaced from left to right, including sleeves and cladding heads connected to the bottom ends of the sleeves, with the output ends of the cladding heads facing the inner wall of the pump body. The two sleeves in the two sets of cladding components are coaxial with the two circular segments in the positioning protrusions respectively;

[0014] The rotation drive mechanism is installed on the frame and is used to drive the sleeves in the two sets of cladding assemblies to rotate alternately in the form of one circle each in the forward and reverse directions around their own axes;

[0015] The vertical feeding mechanism is installed on the frame and is used to drive the two sets of cladding components to move up or down a set distance after each rotation.

[0016] Using the above-mentioned technical solution, the pump body is sleeved on the outer side of the positioning protrusion, and the bottom surface of the pump body rests on the top surface of the positioning platform, thereby positioning the pump body and preventing movement of the pump body during the laser cladding process. Two sets of cladding assemblies are provided, and the two sets of laser cladding assemblies simultaneously perform laser cladding processing on the two cylindrical cavities in the pump body, which can shorten the processing time by half and improve processing efficiency. During the processing, the pump body is stationary, and the laser cladding processing of the inner surface of the pump body is achieved by driving the cladding assembly to rotate and move up and down. Compared with the processing method of driving the workpiece to rotate in the prior art, there is no need to waste manpower and time to adjust the position of the pump body to change the rotation axis during processing, making the processing process easier, less time-consuming, and more efficient. By driving the sleeve in the cladding assembly to rotate alternately around its own axis in a forward and reverse rotation pattern through a rotation drive mechanism, it can prevent the cladding assembly from continuously rotating in the same direction, causing entanglement in the gas and metal powder conveying pipes connected to the cladding assembly.

[0017] Furthermore, there is a fixed height difference between the two groups of cladding components, so that when one of the cladding heads points to the bottom of the cladding area inside the pump body, the other cladding head points to the top of the cladding area inside the pump body. The vertical feeding mechanism can drive the two groups of cladding components to move up and down a set distance in an alternating manner after each rotation.

[0018] By adopting the above technical solution, there is a height difference between the two groups of cladding components. After the two groups of cladding components are inserted into the inner cavity of the pump body, one of the cladding heads is facing the top of the cladding area, and the other cladding head is facing the bottom of the cladding area. During the laser cladding process, the two cladding heads are driven to move up and down alternately by the vertical feed mechanism. In this way, during the processing, a cladding area is formed from top to bottom in one of the cylindrical inner cavities in the pump body, and a cladding area is formed from bottom to top in the other cylindrical inner cavity. In this way, the two heated areas in the pump body will not be concentrated at the same height. The two heated areas are separated for most of the time, which is conducive to better heat dissipation and avoids the influence of concentrated heat on the overall performance of the pump body.

[0019] Furthermore, the vertical feeding mechanism includes:

[0020] A double-thread screw extending vertically comprises two thread segments arranged one above the other with opposite thread rotation directions;

[0021] The connecting piece is provided with two pieces, which are installed on the frame with upper and lower guide slides, and are respectively spirally sleeved on the two threaded sections and connected to the two sets of cladding components;

[0022] The second driving motor is installed on the frame and is used to drive the double-thread screw to rotate around its own axis to drive the two connecting parts to move upward and downward toward each other.

[0023] By adopting the above technical solution, the double-thread screw is driven to rotate, which drives the two groups of cladding components to move up and down alternately, so that the size of the cladding components moving up and down each time is more precise.

[0024] Furthermore, a lifting drive mechanism is installed on the frame, which is used to drive the two groups of cladding components to move up and down synchronously, so that the two groups of laser cladding can leave the inner cavity of the pump body from bottom to top or insert into the inner cavity of the pump body from top to bottom.

[0025] By adopting the above technical solution, the lifting drive mechanism drives the two groups of cladding components to move upward or downward synchronously as a whole, so that the two cladding heads with a height difference can be inserted into the inner cavity of the pump body before the laser cladding process begins, and the two cladding heads can be pulled out from the inner cavity of the pump body after the laser cladding is completed, thereby facilitating the removal of the pump body from the frame.

[0026] Furthermore, the rotation drive mechanism includes a drive motor and a transmission assembly, and the transmission assembly includes:

[0027] The tooth frame is slidably mounted on the frame in the left-right direction, and meshing teeth are provided on two inner side walls and a rear side wall of the tooth frame facing each other.

[0028] Gear 1 is connected to the output end of drive motor 1. Part of the outer ring of gear 1 is provided with meshing teeth. Gear 1 is located inside the gear frame. During the rotation process, gear 1 meshes with the meshing teeth on the front and rear sides of the gear frame in turn to drive the gear frame to move back and forth.

[0029] Gear 2 is provided with two, respectively, anti-rotation sleeves arranged on the outside of the two sleeves. The sleeves can slide up and down relative to gear 2. Both gears 2 are engaged with the meshing teeth on the rear side wall of the gear frame, so that they are driven to rotate alternately in the form of one circle each in the forward and reverse directions during the reciprocating movement of the gear frame.

[0030] By adopting the above technical solution and setting up a transmission component, the driving motor can drive the sleeves in the two groups of cladding components to rotate alternately in the form of one circle forward and one circle reverse by keeping rotating in the same direction. There is no need to rotate the driving motor alternately in the forward and reverse directions, which is beneficial to extending the service life of the motor.

[0031] Furthermore, the positioning piece is elastically slidably installed on the frame, and a blanking port is provided on the positioning piece, which passes through the positioning piece. A collecting chamber for accommodating metal powder is provided on the frame below the positioning piece, and the blanking port is connected to the collecting chamber.

[0032] By adopting the above technical solution, during the laser cladding process, some of the metal powder sprayed from the cladding head will inevitably splash and scatter and fail to cover the metal surface. By opening a blanking port and setting a collection chamber, these scattered metal powders can be collected in the collection chamber, which can avoid waste. The accumulated metal powder can be processed and reused, which can save resources.

[0033] Furthermore, there are two blanking ports, which are respectively opened on two circular segments. The blanking ports are in the shape of long strips extending radially along the circular segments. Scrapers are installed on the tops of the two circular segments and rotate around the central axis of the circular segments. The scrapers extend radially along the circular segments. The scrapers can rotate to scrape the metal powder falling on the top surface of the circular segments into the blanking ports.

[0034] By adopting the above technical solution, both circular segments are provided with a drop opening and a scraper. The scraper can scrape the metal powder falling on the surface of the circular segment into the drop opening and then fall into the collection box, making it more convenient to collect the scattered metal powder.

[0035] Furthermore, a sleeve is rotated through the center of each of the two circular segments, and the upper and lower positions of the sleeve and the circular segment are relatively fixed. The top of the sleeve extends to the top of the circular segment and is connected to the scraper. Two trigger rods 1 that are coaxial with the two sleeves are provided in the collection chamber. The trigger rod 1 is inserted into the corresponding sleeve and cooperates with the sleeve in a spiral transmission. When the positioning part moves up and down, the sleeve rotates in a spiral cooperation with the trigger rod 1 to drive the scraper to scrape the metal powder into the drop port.

[0036] By adopting the above technical solution, when the pump body is placed on the positioning part and when the pump body is removed from the positioning part, the positioning part can move up and down under the elastic action, and the sleeve cooperates with the trigger rod in a spiral transmission, so that the sleeve can be driven to rotate, so that the scraper can be driven by the sleeve to rotate, and the metal powder on the surface of the circular segment is automatically scraped into the drop port. There is no need to set a driving mechanism to drive the scraper to rotate, nor to push the scraper to rotate by hand. The metal powder fallen on the circular segment can be collected uniformly only in the process of removing the pump body after each pump body processing is completed. The structure is ingenious and can save power costs.

[0037] Furthermore, a movable frame is installed in the collection chamber, the rear end of the movable frame is open, and a collection box with an open top is inserted into the movable frame from back to front. The bottom end of the feed port is connected to a feed channel, and the bottom end of the feed channel passes through the top side wall of the movable frame and extends into the inner cavity of the collection box.

[0038] By adopting the above technical solution, by setting up a movable frame and a collecting box, the metal powder will fall into the collecting box. By pulling out the collecting box, the collected metal powder can be taken out, and the method of taking out the metal powder is simpler.

[0039] Furthermore, the moving frame is elastically slidably installed on the frame left and right, and a push-bearing member is connected to the front side of the moving frame. A cam is installed in the collecting chamber in front of the moving frame and rotates around a vertically extending rotation axis. The cam is pressed on the push-bearing member, and a vertically extending spiral slot is provided in the cam. The bottom of the positioning member is connected to a trigger rod 2, which is inserted in the spiral slot and cooperates with the cam spiral transmission. When the positioning member moves in the up and down directions, the trigger rod 2 drives the cam to rotate through the spiral transmission, thereby driving the moving frame to swing left and right by pushing the push-bearing member.

[0040] With this technical solution, as the positioning member moves up and down, the cam is driven to rotate, thereby shifting the thrust plate, causing it to rock left and right, which in turn causes the movable frame and the collection box to rock left and right. During this rocking process, the metal powder that has fallen into the collection box is spread out, preventing the metal powder from concentrating in the same location within the collection box and failing to fill the internal space. By rocking the collection box to spread the metal powder, rather than using a guide ramp to concentrate the metal powder that has fallen from the two conveying channels to the same location, the collection box can be made flatter because the guide ramp is not needed. This reduces the height of the positioning member and makes it easier to place the pump body on the positioning member.

[0041] The beneficial effects of the laser cladding equipment for a vacuum pump body provided by the present invention are as follows: two groups of cladding components are provided, and the two groups of cladding components are driven to rotate and move in the up and down directions to perform laser cladding processing on the inner wall of the pump body of the screw vacuum pump. During the processing, there is no need to adjust the state of the pump body, which can save manpower and improve processing efficiency. The cladding components rotate alternately in the form of one circle forward and one circle reverse, and there will be no entanglement of the pipes used to transport protective gas and metal powder. The metal powder scattered on the circular segment is automatically collected by the elastic movement of the positioning part up and down, thereby avoiding powder waste. The elastic movement of the positioning part up and down drives the collection box to swing left and right, thereby improving the effective utilization rate of the inner cavity of the collection box, simplifying the structure, and saving power costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 Schematic diagram of the three-dimensional structure of a laser cladding device for a vacuum pump body provided by the present invention Figure 1 ;

[0043] Figure 2 Schematic diagram of the three-dimensional structure of a laser cladding device for a vacuum pump body provided by the present invention Figure 2 ;

[0044] Figure 3 A front view of a laser cladding device for a vacuum pump body provided by the present invention;

[0045] Figure 4 This is a left side view of a laser cladding device for a vacuum pump body provided by the present invention;

[0046] Figure 5 A rear view of a laser cladding device for a vacuum pump body provided by the present invention;

[0047] Figure 6 A top view of a frame in a laser cladding device for a vacuum pump body provided by the present invention;

[0048] Figure 7 for Figure 6 Cross-sectional view at AA in the middle;

[0049] Figure 8 for Figure 7 A magnified schematic diagram of the structure at B in the middle;

[0050] Figure 9 A schematic diagram of the three-dimensional structure of a positioning member in a laser cladding device for a vacuum pump body provided by the present invention, viewed from a top perspective;

[0051] Figure 10 This is a schematic diagram of the three-dimensional structure from a bottom-up perspective of a positioning member in a laser cladding device for a vacuum pump body provided by the present invention.

[0052] Description of reference numerals:

[0053] 1. Frame; 101. Base; 102. Vertical beam; 103. Square socket; 104. Support plate; 105. Collection chamber; 2. Pump body; 3. Top channel section; 4. Casing; 5. Cladding head; 6. Positioning piece; 601. Positioning protrusion; 602. Positioning platform; 603. Positioning base; 604. Blanking port; 7. Double-thread screw; 8. Gear frame; 9. Gear 1; 10. Gear 2; 11. Lifting cylinder; 12. Slider 1; 13. Slider 2; 14. Support Support frame; 15. Driving motor 2; 16. Pushing member; 17. Connecting rod; 18. Collecting box; 19. Handle; 20. Elastic member 2; 21. Moving frame; 22. Support plate; 23. Cam; 24. Trigger rod 1; 25. Elastic member 1; 26. Bottom channel section; 27. Insert plate; 28. Scraper; 29. Arc baffle; 30. Sleeve; 31. Trigger rod 2; 32. Connecting plate 2; 33. Extension plate; 34. Sliding frame; 35. Connecting plate 1; 36. Push plate. DETAILED DESCRIPTION

[0054] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Those skilled in the art should know that the embodiments described below are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative efforts shall fall within the scope of protection of the present invention.

[0055] The following is one embodiment of a laser cladding device for a vacuum pump body provided by the present invention:

[0056] like Figures 1-10 As shown, a laser cladding device for a vacuum pump body includes a frame 1, a positioning member 6, a cladding assembly, a rotation drive mechanism, a vertical feeding mechanism, a lifting drive mechanism and a collecting mechanism.

[0057] like Figure 1-Figure 5 As shown, the frame 1 includes a base 101 and two vertical beams 102 connected to the front end of the base 101. Figure 6 、 Figure 7 As shown, the base 101 is provided with an open-top, figure-8-shaped collection chamber 105. A square socket 103 is provided on the rear side of the base 101, communicating with the collection chamber 105. A support plate 22 and two vertically extending trigger rods 24 are also connected to the base 101 within the collection chamber 105. The support plate 22 is located to the left of the square socket 103, and the two trigger rods 24 are located to the right of the support plate 22 and spaced apart in the left-right direction.

[0058] The two vertical beams 102 are spaced apart from each other from left to right, and a sliding groove with a T-shaped cross section extending vertically is provided on each side of the two vertical beams 102 close to each other. Figure 2 、 Figure 5 As shown, a slider 12 and a slider 2 13 are arranged sequentially from top to bottom between the two vertical beams 102. Both sliders 12 and 13 are guided and slid between the two vertical beams 102 via chutes on the two vertical beams 102. An L-shaped support frame 14 is connected to the bottom of the slider 2 13. A horizontal support plate 104 is fixedly connected to the rear side of the two vertical beams 102. The support plate 104 is located above the base 101, and the distance between the support plate 104 and the base 101 is greater than the height of the pump body 2 to be processed.

[0059] Two connecting rods 17 are connected between the sliding member 12 and the sliding member 2 13 , and the upper and lower positions of the sliding member 12 and the sliding member 2 13 are kept relatively fixed by the connecting rods 17 .

[0060] like Figure 9 、 Figure 10As shown, the positioning member 6 is connected to the base 101. The positioning member 6 includes a positioning protrusion 601, a positioning platform 602, and a positioning base 603 connected in sequence from top to bottom. The positioning protrusion 601 is in the shape of an "8", including two circular segments with overlapping parts arranged in the left and right directions. The shape and size of the positioning protrusion 601 are adapted to the shape and size of the inner cavity of the pump body 2 to be processed. The positioning platform 602 is a plate-like structure in the shape of an "8". The positioning platform 602 is coaxially connected to the positioning protrusion 601 at the bottom of the positioning protrusion 601. The external dimensions of the positioning platform 602 are larger than the external dimensions of the positioning protrusion 601. The positioning base 603 is an annular structure in the shape of an "8". The external dimensions of the positioning base 603 are slightly smaller than the external dimensions of the positioning platform 602. The positioning base 603 is adapted and inserted into the collection chamber 105 from top to bottom.

[0061] like Figure 9 As shown, each of the circular segments is provided with a blanking opening 604 , which is in the shape of a strip extending radially along the circular segment, and passes through the entire positioning member 6 in the up-down direction.

[0062] like Figure 6 、 Figure 7 As shown, an elastic member 25 is connected between the positioning platform 602 and the bottom cavity wall of the collecting chamber 105. The elastic member 25 is a compression spring that can be extended and retracted up and down. When the elastic member 25 is in a natural state, the positioning platform 602 is located above the top surface of the base 101. When the pump body 2 is placed on the positioning platform 602, the elastic member 25 is compressed, and the positioning member 6 moves downward as a whole, so that the positioning platform 602 is pressed against the top surface of the base 101.

[0063] like Figure 10 As shown, a second trigger rod 31 is vertically connected to the bottom of the positioning platform 602 , and the second trigger rod 31 is located at the front side of the area between the central axes of the two circular segments.

[0064] A sleeve 30 is rotatably mounted at the center of each circular segment. Sleeve 30 is fixedly positioned vertically on positioning member 6. The top end of sleeve 30 is closed, while the bottom end is open. The top of sleeve 30 protrudes upward from positioning member 6 and is connected to a scraper 28 extending radially along the circular segment. The end of scraper 28, facing away from sleeve 30, is connected to an arc-shaped baffle 29 coaxial with the circular segment.

[0065] The two trigger rods 1 (24) are inserted upward from bottom to top within the two sleeves 30, and engage with the sleeves 30 in a screw-driven manner. When the positioning member 6 moves vertically, the trigger rods 1 (24) and the sleeves 30 are screw-driven, driving the sleeves 30 to rotate. The sleeves 30 then rotate the scrapers 28, which scrape the metal powder on the surface of the positioning protrusions 601 into the discharge port 604. The arc-shaped baffle 29 blocks the metal powder and prevents it from spilling from the end of the positioning protrusions 601.

[0066] like Figure 1 As shown, there are two groups of cladding assemblies, which are spaced apart in the left-right direction. The cladding assemblies include a vertically extending sleeve 4 and a cladding head 5 connected to the bottom end of the sleeve 4. A vertically extending guide groove is provided on the outer wall of the sleeve 4. The direction of the output end of the cladding head 5 forms an obtuse angle with the axial direction of the sleeve 4. The two sleeves 4 in the two groups of cladding assemblies are coaxial with the two circular segments mentioned above.

[0067] like Figure 1 、 Figure 2 As shown, the rotation drive mechanism includes a drive motor and a transmission assembly.

[0068] The driving motor 1 is fixedly mounted on the bottom of the supporting plate 104 , and the driving motor 1 is not shown in the figure.

[0069] The transmission assembly includes a gear frame 8, gear 1 9 and gear 2 10.

[0070] The tooth frame 8 is rectangular, and meshing teeth are provided on the two inner side walls facing each other and the rear side wall of the tooth frame 8. The tooth frame 8 is located at the top of the above-mentioned support plate 104 and is installed on the support plate 104 with left and right guide sliding. The tooth frame 8 is fixed in the upper and lower positions on the support plate 104.

[0071] Gear 109 is rotatably mounted on the support plate 104 around a vertically extending rotation axis. The upper and lower positions of gear 109 on the support plate 104 are fixed. Gear 109 is located on the inner side of the gear frame 8. Part of the outer ring of gear 109 is provided with meshing teeth. Gear 109 is connected to the drive motor 1 for rotation by the drive motor 1. During the rotation of gear 109, the meshing teeth on it mesh with the meshing teeth on the front and rear inner walls of the gear frame 8 in turn to drive the gear frame 8 to move back and forth in the left and right directions.

[0072] There are two gears 10, and both gears 10 are rotatably mounted on the support plate 104 around a vertically extending rotation axis. The upper and lower positions of the gear 10 on the support plate 104 are fixed. A protrusion is provided in the inner ring of the gear 10. The above-mentioned two sleeves 4 pass through the two gears 10 from top to bottom respectively, and the protrusions on the gear 10 are inserted into the guide grooves on the outer sides of the corresponding sleeves 4. The cooperation between the protrusions and the guide grooves prevents the gear 10 and the sleeve 4 from rotating against each other, and the gear 10 does not affect the up and down sliding of the sleeve 4.

[0073] like Figure 1-Figure 5 As shown, the vertical feeding mechanism includes a driving motor 2 15, a double-thread screw 7 and a connecting piece.

[0074] The driving motor 2 15 is installed on the above-mentioned support frame 14, and the double-thread screw 7 extends vertically and is rotatably connected between the above-mentioned sliding member 12 and the sliding member 2 13. The double-thread screw 7 and the sliding member 12 and the sliding member 2 13 are relatively fixed in the up and down directions. The double-thread screw 7 has two thread sections with opposite rotation directions arranged at an upper and lower intervals. The double-thread screw 7 is transmission-connected to the above-mentioned driving motor 2 15 so as to be driven by the driving motor 2 15 to rotate.

[0075] There are two connecting parts, namely connecting part 1 and connecting part 2 arranged in sequence from top to bottom. Connecting part 1 includes a sliding frame 34, a connecting plate 1 35 and a connecting plate 2 32. The sliding frame 34 is slidably mounted on the outside of one of the vertical beams 102. The connecting plate 1 35 extends in the front-to-back direction and is used to be connected to the sleeve 4. The positions of the connecting plate 1 35 and the sleeve 4 in the up and down directions are relatively fixed. The sleeve 4 can be rotatably connected to the connecting plate 1 35. The connecting plate 2 32 is connected to the side of the sliding frame 34 close to the other vertical beam 102. The connecting plate 2 32 is spirally mounted on the upper threaded section of the double-thread screw 7.

[0076] The structure of the second connector is similar to that of the first connector, except that a vertically extending extension plate 33 is connected between the sliding frame 34 in the second connector and the second connecting plate 32. The extension plate 33 creates a height difference between the sliding frame 34 in the second connector and the second connecting plate 32. The second connecting plate 32 in the second connector is spirally mounted on the lower threaded section of the double-thread screw 7.

[0077] The second driving motor 15 can drive the double-thread screw 7 to rotate, so as to drive the first connecting member to move downward and the second connecting member to move upward, thereby driving the two cladding heads 5 in the two cladding assemblies to move up and down alternately, that is, the two cladding heads 5 move toward each other's initial positions.

[0078] like Figure 2 、 Figure 5As shown, the lifting drive mechanism includes two lifting cylinders 11 arranged at intervals on the left and right. The two lifting cylinders 11 are respectively arranged on the front sides of the two vertical beams 102. A U-shaped push piece 16 is connected to the driving output end of the two lifting cylinders 11. The push piece 16 is connected to the above-mentioned support frame 14. The lifting cylinder 11 can drive the push piece 16 to move up and down, so as to drive the vertical feeding mechanism as a whole to move in the up and down direction.

[0079] like Figure 3 、 Figure 6 、 Figure 7 As shown, the collecting mechanism includes a moving frame 21 , a collecting box 18 and a cam 23 .

[0080] The movable frame 21 is located within the collection chamber 105. The rear end of the movable frame 21 is open, and two square feed openings are spaced apart on the top sidewall. A thrust member is connected to the front sidewall of the movable frame 21, and the thrust member is a vertically extending thrust plate 36. The movable frame 21 is mounted on the base 101 in a guided sliding manner in the left and right directions. A support plate 22 is fixedly connected to the base 101 within the collection chamber 105. The support plate 22 is located on the left side of the movable frame 21 and is connected to the movable frame 21 by an elastic member 20. The elastic member 20 is a tension spring that can expand and contract in the left and right directions.

[0081] like Figure 7 、 Figure 8 、 Figure 10 As shown, a feed channel is connected between the movable frame 21 and the two above-mentioned blanking ports 604, and the feed channel includes a top channel section 3 and a bottom channel section 26 that are plugged in together. The top channel section 3 is fixedly connected to the bottom of the positioning platform 602, and a group of double-layer plug-in plates are connected to the left and right sides of the bottom channel section 26. The double-layer plug-in plates include two horizontal plug-in plates 27 arranged at intervals up and down. The double-layer plug-in plates on both sides of the bottom channel section 26 are respectively inserted into the top side walls of the movable frame 21 located on the left and right sides of the square feed port, so that the bottom channel section 26 can slide left and right on the movable frame 21 without exposing the square feed port.

[0082] The top of the collection box 18 is open, and a handle 19 is connected to the back side. The collection box 18 is adapted to be inserted into the movable frame 21 from back to front. The cooperation between the collection box 18 and the movable frame 21 requires a certain pulling force to be applied to the collection box 18 in order to pull the collection box 18 out of the movable frame 21.

[0083] The cam 23 is located in the collecting chamber 105 and at the front side of the movable frame 21. The cam 23 has two oppositely arranged protrusions. The cam 23 is rotatably mounted on the base 101 around a vertically extending rotation axis. The protrusions of the cam 23 are pressed against the thrust plate.

[0084] A vertically extending spiral slot is provided in the middle of the cam 23. The aforementioned trigger lever 31 is inserted into the spiral slot and engages the cam 23's spiral transmission. As the trigger lever 31 moves up and down, the spiral transmission drives the cam 23 to rotate. The two protrusions of the cam 23 sequentially move the push plate 36, causing the movable frame 21 to shake left and right. As the movable frame 21 shakes left and right, the metal powder that has fallen into the collection box 18 shakes and disperses, preventing the fallen metal powder from accumulating in one place and blocking the square feed port.

[0085] When the present invention is in use, in the initial state, the two cladding heads 5 in the two groups of cladding assemblies are in a state of one high and one low, and the height difference between the two cladding heads 5 is equal to the height dimension of the area requiring laser cladding in the pump body 2 of the screw vacuum pump to be processed. There is a gap between the lower cladding head 5 and the positioning member 6, and the gap dimension is greater than the height dimension of the pump body 2 of the screw vacuum pump.

[0086] Then, the pump body 2 of the screw vacuum pump to be processed is placed on the positioning part 6 by manual or robot-assisted transportation. The bottom of the pump body 2 is mounted on the outside of the positioning protrusion 601 from top to bottom. The positioning part 6 moves downward under the pressure of the pump body 2, and finally moves to the bottom surface of the positioning platform 602 and abuts against the top surface of the base 101.

[0087] During the downward movement of the positioning member 6, the sleeve 30 and the trigger rod 1 24 are screw-driven, and the sleeve 30 is driven to rotate, thereby driving the scraper 28 to rotate. The scraper 28 scrapes the metal powder that was not scraped clean on the top surface of the positioning protrusion 601 during the previous round of laser cladding processing again into the drop port 604, and the metal powder falls into the collection box 18 through the feeding channel. At the same time, the downward moving positioning member 6 also drives the trigger rod 2 31 to cooperate with the cam 23 in screw-driven mode, and the cam 23 is driven to rotate. The protrusion in the cam 23 drives the movable frame 21 to rock left and right through the push plate, causing the metal powder that has fallen into the collection box 18 to rock left and right, making the metal powder in the collection box 18 more dispersed, avoiding blockage at the square feed port, and allowing the collection box 18 to accommodate more metal powder.

[0088] Then the lifting drive mechanism is started, and the two lifting cylinders 11 drive the vertical feed mechanism and the sliding member 12 and the sliding member 2 13 to move downward synchronously as a whole, so that the two laser cladding heads 5 in the two groups of laser cladding assemblies are inserted into the inner cavity of the pump body 2, and the output end of the higher cladding head 5 is directed toward the top end of the area to be laser clad in the inner wall of one of the cylindrical sections in the pump body 2, and the output end of the lower cladding head 5 is directed toward the bottom end of the area to be laser clad in the other cylindrical section in the pump body 2.

[0089] After that, the laser cladding process is started, the laser cladding component is controlled to start working, and the drive motor 1 is started. The drive motor 1 drives the two sleeves 4 to rotate in an alternating manner of one forward rotation and one reverse rotation through the transmission component. After each rotation of the sleeve 4, the drive motor 1 is stopped, and the drive motor 2 15 is started. The drive motor 2 15 drives the double-thread screw 7 to rotate, and the double-thread screw 7 drives the connecting parts 1 and 2 thereon to approach each other, and drives the two cladding heads 5 to move toward each other a set distance. After that, the drive motor 2 15 is stopped, the drive motor 1 is started again, and the above steps are repeated to finally complete the laser cladding process of the areas that need to be laser clad in the two cylindrical inner cavities of the pump body 2.

[0090] After the laser cladding process is completed, the lifting cylinder 11 is started again, and the lifting cylinder 11 drives the vertical feed mechanism, slide 12, and slide 2 13 to move upward as a whole, so that the two cladding heads 5 in the two sets of laser cladding assemblies leave the inner cavity of the pump body 2. The pump body 2 that has completed laser cladding can then be removed from the positioning member 6 by manual handling or robot-assisted handling. During the removal of the pump body 2, the pressure on the positioning member 6 is reduced, the elastic member 1 25 gradually recovers its deformation, and the positioning member 6 gradually moves upward. During the movement, the cam 23 and the scraper 28 are driven to rotate again. The scraper 28 scrapes the metal powder that falls on the top surface of the positioning protrusion 601 during the laser cladding process into the drop port 604. The cam 23 drives the movable frame 21 to shake, so that the metal powder that falls into the collection box 18 becomes more dispersed.

[0091] Then continue to repeat the above steps and perform laser cladding processing on the next pump body 2. After more pump bodies 2 have been processed and the collecting box 18 is filled with metal powder, the collecting box 18 is pulled out from the movable frame 21 through the handle 19, and the collected metal powder is poured out for processing. Then, the empty collecting box 18 is inserted into the movable frame 21 again to continue to be used to collect metal powder.

[0092] The present invention can simultaneously perform laser cladding on the inner sidewalls of the two cylindrical cavities in the pump body 2 of a screw vacuum pump, thereby improving processing efficiency. During the processing, the two cladding heads 5 will not be located at the same height position on the pump body 2 for most of the time, avoiding excessive concentration of the heated area of the pump body 2 and improving the heating condition of the pump body 2. The present invention can also automatically recover the metal powder scattered during the laser cladding process, saving resources. The recovery method is simple and does not consume a lot of manpower.

[0093] In this embodiment, the rotation drive mechanism includes a drive motor 1 and a transmission assembly. The output shaft of the drive motor 1 rotates unidirectionally, and drives the two groups of cladding assemblies through the transmission assembly to realize forward and reverse reversing rotation. In other embodiments, the two gears 2 10 of the anti-rotation sleeves on the outside of the two sleeves 4 can also be engaged with each other, and a gear 3 is connected to the output end of the drive motor 1 so that the gear 3 is engaged with one of the gears 2 10 for transmission, and the drive motor 1 is controlled to rotate forward and backward, thereby driving the two gears 2 10 to rotate forward and backward, so as to realize the cladding assembly to rotate alternately in the form of one forward rotation and one reverse rotation.

[0094] In this embodiment, the transmission assembly includes a gear frame 8, gear 1 9, and two gear 2s 10. In other embodiments, the transmission assembly includes a gear frame 8, gear 1 9, one gear 2 10, and a belt transmission assembly. In this case, the gear frame 8, gear 1 9, and gear 2 10 are mounted on the support plate 104 in the same manner as in this embodiment, with the difference being that only one of the sleeves 4 is fixedly inserted into gear 2 10, and this gear 2 10 is driven to rotate by the left-right moving gear frame 8. The belt transmission assembly includes two pulleys and a transmission belt sleeved on the outside of the two pulleys. One pulley is coaxial with gear 2 10 and fixedly connected above gear 2 10, and can be driven to rotate by gear 2 10. The other pulley is rotatably mounted on the support plate 104 and is relatively fixed in an upper and lower position on the support plate 104. The other sleeve 4 is fixedly inserted into the other pulley to be driven to rotate by the other pulley. At this time, since the gear frame 8 is only meshed with one gear 2 10, compared with the embodiment in which the gear frame 8 is simultaneously meshed with two gears 2 10, the processing accuracy requirements for the gear frame 8 and the gear 2 10 are lower, which can reduce the processing costs of the gear frame 8 and the gear 2 10.

[0095] In this embodiment, the vertical feeding mechanism includes a double-thread screw 7, a drive motor 15 and a connecting piece. In other embodiments, the vertical feeding mechanism includes two cylinders with output ends that can move vertically, and two sleeves 4 are respectively connected to the output ends of the two cylinders. The two cylinders respectively drive two groups of cladding components to move intermittently up and down a set distance to realize the feeding of the cladding components.

Claims

1. A laser cladding device for a vacuum pump body, comprising: The rack is characterized by further comprising: The positioning member is horizontally arranged on the frame, and includes a positioning platform and a positioning protrusion arranged on the top surface of the positioning platform. The positioning protrusion includes two circular segments with overlapping portions. The positioning protrusion is adapted to be inserted into the bottom end of the pump body, and the top surface of the positioning platform is used for the bottom surface of the pump body to abut against. There are two sets of cladding components spaced from left to right, including sleeves and cladding heads connected to the bottom ends of the sleeves, with the output ends of the cladding heads facing the inner wall of the pump body. The two sleeves in the two sets of cladding components are coaxial with the two circular segments in the positioning protrusions respectively; The rotation drive mechanism is installed on the frame and is used to drive the sleeves in the two sets of cladding assemblies to rotate alternately in the form of one circle each in the forward and reverse directions around their own axes; A vertical feed mechanism is mounted on the frame and is used to drive the two cladding assemblies to move up or down a set distance after each rotation. There is a fixed height difference between the two cladding assemblies, so that when one cladding head points to the bottom of the cladding area inside the pump body, the other cladding head points to the top of the cladding area inside the pump body. The vertical feed mechanism can drive the two cladding assemblies to move up and down a set distance in an alternating manner after each rotation. The rotation drive mechanism includes a drive motor and a transmission assembly, and the transmission assembly includes: The tooth frame is slidably mounted on the frame in the left-right direction, and meshing teeth are provided on two inner side walls and a rear side wall of the tooth frame facing each other. Gear 1 is connected to the output end of drive motor 1. Part of the outer ring of gear 1 is provided with meshing teeth. Gear 1 is located inside the gear frame. During the rotation process, gear 1 meshes with the meshing teeth on the front and rear sides of the gear frame in turn to drive the gear frame to move back and forth. Gear 2 is provided with two, respectively, anti-rotation sleeves arranged on the outside of the two sleeves. The sleeves can slide up and down relative to gear 2. Both gears 2 are engaged with the meshing teeth on the rear side wall of the gear frame, so that they are driven to rotate alternately in the form of one circle each in the forward and reverse directions during the reciprocating movement of the gear frame.

2. The laser cladding equipment for a vacuum pump body according to claim 1, characterized in that: The vertical feeding mechanism includes: A double-thread screw extending vertically comprises two thread segments arranged one above the other with opposite thread rotation directions; The connecting piece is provided with two pieces, which are installed on the frame with upper and lower guide slides, and are respectively spirally sleeved on the two threaded sections and connected to the two sets of cladding components; The second driving motor is installed on the frame and is used to drive the double-thread screw to rotate around its own axis to drive the two connecting parts to move upward and downward toward each other.

3. The laser cladding equipment for a vacuum pump body according to claim 2, characterized in that: The frame is also equipped with a lifting drive mechanism, which is used to drive the two sets of cladding components to move up and down synchronously, so that the two sets of laser cladding components can leave the inner cavity of the pump body from bottom to top or insert into the inner cavity of the pump body from top to bottom.

4. A laser cladding equipment for a vacuum pump body according to any one of claims 1 to 3, characterized in that: The positioning piece is elastically slidably installed on the frame, and a blanking port is provided on the positioning piece, and a collecting chamber for accommodating metal powder is provided below the positioning piece on the frame, and the blanking port is communicated with the collecting chamber.

5. The laser cladding equipment for a vacuum pump body according to claim 4, characterized in that: There are two blanking ports, which are respectively opened on two circular segments. The blanking ports are in the shape of long strips extending radially along the circular segments. Scrapers are installed on the tops of the two circular segments and rotate around the central axis of the circular segments. The scrapers extend radially along the circular segments and can rotate to scrape the metal powder falling on the top surface of the circular segments into the blanking ports.

6. The laser cladding equipment for a vacuum pump body according to claim 5, characterized in that: A sleeve is rotated through the center of the two circular segments, and the upper and lower positions of the sleeve and the circular segment are relatively fixed. The top of the sleeve extends to the top of the circular segment and is connected to the scraper. Two trigger rods 1 coaxial with the two sleeves are provided in the collection chamber. The trigger rod 1 is inserted into the corresponding sleeve and cooperates with the sleeve spiral transmission. When the positioning part moves up and down, the sleeve and the trigger rod 1 rotate in spiral cooperation to drive the scraper to scrape the metal powder into the drop port.

7. The laser cladding equipment for a vacuum pump body according to claim 6, characterized in that: A movable frame is installed in the collecting chamber, the rear end of the movable frame is open, and a collecting box with an open top is inserted into the movable frame from back to front. The bottom end of the feed port is connected to a feed channel, and the bottom end of the feed channel passes through the top side wall of the movable frame and extends into the inner cavity of the collecting box.

8. The laser cladding equipment for a vacuum pump body according to claim 7, characterized in that: The moving frame is elastically slidably installed on the frame left and right, and a push piece is connected to the front side of the moving frame. A cam is installed in the collecting chamber in front of the moving frame and rotates around a vertically extending rotation axis. The cam is pressed on the push piece, and a vertically extending spiral slot is provided in the cam. The bottom of the positioning piece is connected to a trigger rod 2, which is inserted in the spiral slot and cooperates with the cam spiral transmission. When the positioning piece moves in the up and down directions, the trigger rod 2 drives the cam to rotate through the spiral transmission, thereby driving the moving frame to swing left and right by pushing the push piece.

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