Screw vacuum pump detection device

Abstract

The invention relates to the technical field of vacuum pump detection, in particular to a screw vacuum pump detection device which comprises a test platform, a belt driving assembly and supporting frames installed on the left side and the right side of the test platform, a screw is placed between the two supporting frames, and the belt driving assembly comprises an installation frame, a transmission belt, a fixed pulley and a floating pulley; two chutes are formed in the mounting frame, the two chutes are symmetrically formed in the front side and the rear side of the screw rod, and at least one fixed pulley is connected with a driving motor used for driving the fixed pulley to rotate; the transmission belt sequentially passes through the two fixed pulleys and the two floating pulleys, and the two floating pulleys are provided with adjusting shafts; and the two floating pulleys symmetrically move along the chute through the elastic adjusting assembly and tension the transmission belt. The two floating pulleys are tensioned on the front side and the rear side of the screw rod through the elastic adjusting assembly, so that the driving of the transmission belt to the screw rod is relatively stable.

Description

Technical Field

[0001] The invention relates to the technical field of vacuum pump detection, and in particular to a screw vacuum pump detection device. Background Art

[0002] During the production and maintenance of screw vacuum pumps, dynamic balancing of the screw is a key step to ensure smooth operation of the pump body and reduce vibration and noise. Dynamic balancing measures evaluate the quality of the screw by measuring the imbalance of the screw during rotation. This process is of great significance for improving the overall performance and extending the service life of the screw vacuum pump. During the dynamic balancing test of the screw vacuum pump, it is usually necessary to install the screw on a special testing device and measure its imbalance by rotating it. During the test, it is necessary to accurately measure the vibration of the screw at different speeds, and adjust the balance of the screw accordingly to ensure that it can remain stable when rotating at high speeds.

[0003] A Chinese patent document with authorization announcement number CN214951973U discloses a vacuum pump screw dynamic balancing tester, including a test platform, a first support frame and a second support frame, the first support frame and the second support frame are arranged on the test platform relatively, the first support frame is provided with two support rollers in the horizontal direction, a first pressure wheel is arranged above the two support rollers, the first support frame is provided with a belt driving device, the second support frame is provided with two support rollers in the horizontal direction, the belt driving device includes a support plate, a belt and a motor, a side surface of the support plate is rotatably provided with a first pulley, a second pulley, a third pulley and a fourth pulley, the second pulley and the third pulley are located above the first pulley and the fourth pulley, the first pulley and the fourth pulley are respectively located on both sides of the support roller, the belt passes around the first pulley, the second pulley, the third pulley and the fourth pulley in turn, the motor can drive the first pulley to rotate to drive the belt transmission, and the screw is driven to rotate by the friction force of the belt on the side wall of the screw, so that the running state of the screw is detected by the sensor installed on the second support frame.

[0004] However, the first pulley, the second pulley, the third pulley and the fourth pulley are all rotatably connected to the support plate. When the belt passes through the first pulley, the second pulley, the third pulley in sequence, contacts the screw and then passes through the fourth pulley, the belt length is set to just abut against the screw. However, during the inspection process, the screw rotates. If the quality of the screw is unqualified, it may jump up and down. This jumping may cause the screw to separate from the belt, making it impossible for the belt to maintain good contact with the screw. In turn, this will cause the rotation speed of the screw to be unstable, affecting the accuracy of the screw imbalance detection, and providing an inaccurate basis for the subsequent adjustment of the balance state of the screw. Summary of the invention

[0005] The present invention provides a screw vacuum pump detection device, aiming to solve the problem in the related art that during the vacuum pump detection process, the screw cannot maintain good transmission with the belt when it jumps.

[0006] A screw vacuum pump detection device of the present invention comprises a test platform, a belt drive assembly and a support frame installed on the left and right sides of the test platform, a screw is placed between the two support frames, the support frame comprises two support wheels movably arranged in the vertical direction, the ends of the screw are supported on the two support wheels, and the belt drive assembly comprises a mounting frame, a transmission belt, a fixed pulley and a floating pulley; two inclined grooves are provided on the mounting frame, the two inclined grooves are symmetrically arranged on the front and rear sides of the screw, and the mounting frame is arranged on the test platform; two fixed pulleys and two floating pulleys are respectively arranged and symmetrically arranged on the front and rear sides of the screw, and the two floating pulleys are located above the fixed pulley, and at least one of the fixed pulleys is connected to a driving motor for driving the fixed pulley to rotate; the transmission belt passes through the two fixed pulleys and the two floating pulleys in sequence, and passes through the screw between the two floating pulleys, and the two floating pulleys are provided with adjustment shafts, which are inserted into the inclined grooves; the two floating pulleys move symmetrically along the inclined grooves through an elastic adjustment assembly arranged on the mounting frame, and the transmission belts are tensioned.

[0007] The effect is that when the screw needs to be inspected, the end of the screw is supported by the support wheels on the two support frames. The support wheels are movably arranged in the vertical direction. The transmission belt is connected through the fixed pulley and the floating pulley, and at the same time, the transmission belt bypasses the screw at the position between the two floating pulleys. When the driving motor drives a fixed pulley to rotate, the transmission belt will also rotate accordingly. At the same time, under the action of the elastic adjustment component, the floating pulley will move symmetrically along the inclined groove, so that the two floating pulleys can adjust the tension of the transmission belt at the same time. When the screw rotates and jumps up and down under the action of the transmission belt, the transmission belt connected to the screw can move up and down through the movement of the floating pulley in the inclined groove, thereby ensuring that the screw and the transmission belt maintain a good transmission connection. At the same time, the two floating pulleys tension the transmission belt on the front and rear sides of the screw respectively, and the tensioning amplitude is the same. Therefore, when the screw jumps up and down, the transmission belt has the same contraction on both sides of the screw, thereby ensuring that the transmission belt drives the screw stably.

[0008] Preferably, the elastic adjustment component includes a horizontal cross bar and an elastic member. The horizontal cross bar is vertically slidably connected to the mounting frame. A horizontal groove is opened on the horizontal cross bar. The opening position of the horizontal groove intersects with the oblique groove. The adjustment shaft is inserted into the intersection of the horizontal groove and the oblique groove. The elastic member is connected between the horizontal cross bar and the mounting frame to drive the horizontal cross bar to move vertically and tighten the transmission belt.

[0009] The effect is that: a horizontal groove is provided on the horizontal crossbar, and the adjusting shaft is inserted from the intersection of the horizontal groove and the inclined groove. In this way, when the horizontal crossbar moves in the vertical direction, it can drive the two floating pulleys to move at the same time, and the two move with the same amplitude, thereby ensuring the same tensioning effect on the transmission belts on both sides of the screw.

[0010] Preferably, a lifting assembly is provided in the mounting frame, and the lifting assembly includes a U-shaped frame, a guide rod, a connecting rod and a driving bar. The U-shaped opening of the U-shaped frame faces upward, and the U-shaped frame is directly below the screw rod. The guide rod is slidably connected to the mounting frame, the upper end of the guide rod is fixedly connected to the U-shaped frame, the lower end of the guide rod is rotatably connected to one end of the connecting rod, the driving bar is horizontally slidably connected to the mounting frame, and the end of the connecting rod away from the guide rod is rotatably connected to the driving bar.

[0011] The effect is that the U-shaped frame is fixed on the guide rod, and when the driving bar is moved horizontally, the driving bar can move the guide rod up and down through the connecting rod. When the U-shaped frame moves upward driven by the guide rod, it will drive the transmission belts on both sides of the screw rod to move upward together, so that the transmission belts are separated from the screw rod, which is convenient for removing the screw rod and installing the screw rod next time.

[0012] Preferably, a driving gear is coaxially fixed on the output shaft of the driving motor, the driving gear is connected to a driven gear via a synchronous toothed belt, a transmission gear is coaxially fixed on the driven gear, a movable rack along the front-to-back direction of the test platform is fixed on the driving bar, and the transmission gear is meshed with the movable rack.

[0013] The effect is that when the driving motor rotates in the reverse direction, it can drive the moving rack through the driving gear, the driven gear, and the transmission gear in sequence, so that the driving bar can move along the front and back direction of the test platform. In this way, the position of the transmission belt can be adjusted, so that the driving motor can automatically disengage or contact the transmission belt with the screw.

[0014] Preferably, a return spring is fixedly provided on the driving bar, and when the driving motor rotates in the opposite direction until the transmission gear and the movable rack are disengaged, the return spring maintains the position of the movable rack, and a hand push rod is fixedly provided on the driving bar for pushing the movable rack to engage with the transmission gear.

[0015] The effect is that when the transmission gear is disengaged from the moving rack, the return spring will maintain the position of the moving rack, thereby ensuring that the transmission gear will not accidentally contact the moving rack when the drive motor rotates forward. At this time, the moving rack can be meshed with the transmission gear again by the hand push rod, so that the moving rack can be smoothly driven when the drive motor rotates reversely.

[0016] Preferably, a moving seat is provided below the support frame, and the moving seat is slidably connected to the test platform along the left-right direction. The support frame is connected to the test platform through the moving seat. A moving gear is rotatably provided on the moving seat, and a worm wheel is coaxially provided on the moving gear. The worm wheel is meshed with a worm, and the worm wheel is rotatably connected to the moving seat. A fixed rack is fixedly provided on the test platform along the left-right direction, and the moving gear is meshed with the fixed rack.

[0017] The effect is that: the moving seat is provided with a rotating moving gear, and by rotating the worm, the worm will drive the worm wheel to rotate together, and because the worm wheel and the moving gear are coaxially fixedly connected, they will rotate at the same time. In this way, the moving seat can move along the left and right directions of the test platform, thereby adjusting the distance between the two support frames, and then being able to adapt to and detect screws of different sizes.

[0018] Preferably, a limiting assembly is provided on the support frame, and the limiting assembly includes a left limiting frame and a right limiting frame, the left limiting frame is fixed on the left support frame and abuts against the left end of the screw, the right limiting frame is fixed on the right support frame, a limiting rod is threadedly connected to the right limiting frame, and the end of the limiting rod is rotatably provided with an abutment wheel for abutting against the end of the screw.

[0019] Preferably, the abutment position between the abutment wheel and the end of the screw is offset from the center line of the screw.

[0020] The effect is that rotating the limiting rod can change the position of the abutment wheel so that the abutment wheel abuts against the end of the screw. When the screw rotates, the abutment wheel rotates accordingly, thereby preventing the limiting rod from rotating due to the rotation of the screw. In this way, the left limiting frame and the right limiting frame can effectively limit the two ends of the screw to prevent the screw from axial movement.

[0021] Preferably, the support frame also includes a frame body, a floating frame and a support spring. A accommodating cavity is arranged in the frame body. The floating frame is vertically slidably arranged in the accommodating cavity. The support spring is arranged in the accommodating cavity, and the upper end of the support spring is connected to the floating frame, and the lower end of the support spring is connected to the frame body. The two support wheels are rotatably connected to the floating frame.

[0022] Preferably, the length direction of the inclined groove is perpendicular to the line connecting the screw rod and the fixed pulley.

[0023] By adopting the above technical solution, the beneficial effects of the present invention are as follows: When the screw is rotated and jumps up and down under the action of the transmission belt, the transmission belt connected to the screw can move up and down through the movement of the floating pulley in the inclined groove, thereby ensuring that the screw and the transmission belt maintain a good transmission connection. At the same time, the two floating pulleys respectively tension the transmission belt on the front and rear sides of the screw, and the tensioning amplitude is the same. Therefore, when the screw jumps up and down, the transmission belt has the same contraction condition on both sides of the screw, thereby ensuring that the transmission belt drives the screw more stably. When the drive bar is moved horizontally, the drive bar can move the guide rod up and down through the connecting rod. When the U-shaped frame moves upward under the drive of the guide rod, it will drive the transmission belts on both sides of the screw to move upward together, thereby separating the transmission belt from the screw, which is convenient for removing the screw and also convenient for installing the screw next time. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the appearance of a screw vacuum pump detection device of the present invention; Figure 2 It is a front view of a screw vacuum pump detection device of the present invention; Figure 3 is a schematic diagram of the connection structure of the mobile base in an embodiment of the present invention; Figure 4 is a structural diagram of the support frame on the right side of an embodiment of the present invention; Figure 5 yes Figure 4 Sectional view in the AA direction; Figure 6 is a schematic diagram of the connection structure of the support wheels in an embodiment of the present invention; Figure 7 is a schematic diagram of the internal structure of the mounting frame in an embodiment of the present invention; Figure 8 is a structural diagram of an elastic adjustment component in an embodiment of the present invention.

[0025] Reference numerals: 1. Test platform; 11. T-slot; 2. Support frame; 21. Frame; 22. Support wheel; 23. Floating frame; 24. Support spring; 25. Accommodating chamber; 3. Belt drive assembly; 31. Mounting frame; 311. Inclined groove; 32. Transmission belt; 33. Fixed pulley; 34. Floating pulley; 35. Drive motor; 36. Adjustment shaft; 4. Screw; 5. Limit assembly; 51. Left limit frame; 52. Right limit frame; 53. Limit rod; 54. Abutment wheel; 6. Moving seat; 61. Fixed rack; 62. Moving gear; 63. Worm wheel; 64. Worm; 7. Elastic adjustment assembly; 71. Horizontal cross bar; 72. Elastic member; 73. Guide rail; 74. Horizontal groove; 8. Lifting assembly; 81. U-shaped frame; 82. Guide rod; 83. Connecting rod; 84. Driving bar; 85. Roller; 91. Moving rack; 92. Slide rail; 93. Driving gear; 94. Driven gear; 95. Transmission gear; 96. Reset spring; 97. Push rod. DETAILED DESCRIPTION

[0026] Combine the following Figures 1 to 8 Embodiments of the present invention are described in detail, examples of which are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be construed as limiting the present invention.

[0027] This embodiment discloses a screw vacuum pump detection device, such as Figure 1 and Figure 2 As shown, the device includes a test platform 1 and two support frames 2 installed on the test platform 1. The two support frames 2 are respectively located on the left and right sides of the test platform 1 and are arranged symmetrically, and are used to support the screw 4 so that the two ends of the screw 4 are placed on the upper part of the support frames 2. A belt drive assembly 3 is arranged between the two support frames 2. The belt drive assembly 3 is arranged close to the support frame 2 on the right side of the test platform 1, and is used to drive the screw 4 to rotate. At the same time, a sensor is also fixedly arranged on the support frame 2 on the left side. The sensor is a photoelectric type and is used to detect the rotation speed and angle of the screw 4. During detection, a label needs to be pasted on the side wall of the screw 4, and the sensor recognizes the label.

[0028] refer to Figure 1 and Figure 2, a limit assembly 5 is provided on the support frame 2. The limit assembly 5 includes a left limit frame 51 and a right limit frame 52. The left limit frame 51 is fixed on the support frame 2 on the left side, and the right limit frame 52 is fixed on the support frame 2 on the right side. The left limit frame 51 is plate-shaped and is used to block the left end of the screw rod 4; the right limit frame 52 is also plate-shaped, and a limit rod 53 is threadedly connected to the right limit frame 52. The length direction of the limit rod 53 is parallel to the length direction of the screw rod 4, and one end thereof abuts against the right end face of the screw rod 4. In addition, an abutment wheel 54 can be rotatably provided at the end of the limit rod 53, the axis of the abutment wheel 54 is perpendicular to the limit rod 53, and the abutment wheel 54 is connected to the side wall of the limit rod 53, so that when the abutment wheel 54 abuts against the end of the screw rod 4, it is set away from the center line of the screw rod 4. In this way, when the screw rod 4 is placed on the two support frames 2, its two ends are respectively limited by the left limiting frame 51 and the right limiting frame 52, so that the position of the screw rod 4 in the axial direction is fixed. At the same time, the abutment wheel 54 rotates under the drive of the screw rod 4, which can prevent the screw rod 4 from generating a loosening or tightening torque on the limiting rod 53 when rotating, thereby ensuring that the limiting assembly 5 positions the axis of the screw rod 4.

[0029] refer to Figure 1 A movable seat 6 is fixedly provided below the support frame 2, and the movable seat 6 is slidably connected to the test platform 1 along the left-right direction. A T-slot 11 is provided on the upper surface of the test platform 1, and the length direction of the T-slot 11 extends along the left-right direction of the test platform 1. A T-block is provided below the movable seat 6, and the T-block is slidably connected in the T-slot 11, so that the movable seat 6 can slide along the T-slot 11. At the same time, a fixed rack 61 is fixedly provided on the upper surface of the test platform 1, and the fixed rack 61 is provided parallel to the length direction of the T-slot 11. A movable gear 62 is rotatably provided inside each movable seat 6, and the movable gear 62 is located at the lower part of the movable seat 6 and at a position corresponding to the fixed rack 61. When the movable seat 6 is connected to the test platform 1, the movable gear 62 is meshed with the fixed rack 61. A worm wheel 63 is coaxially fixedly connected to the moving gear 62, and a worm 64 is meshed with the worm wheel 63. The worm 64 is rotatably connected to the moving seat 6, and one end of the worm 64 extends from the side wall of the moving seat 6, so that the staff can rotate the worm 64 conveniently. When the worm 64 is rotated, the worm 64 drives the worm wheel 63 to rotate, and the worm wheel 63 then drives the moving gear 62 to roll on the fixed rack 61, so that the moving seat 6 can move the support frame 2 in the left and right directions along the test platform 1. In this way, screws 4 of different lengths can be tested, and through the self-locking effect of the worm 64 and the worm wheel 63, the two support frames 2 will not move along the test platform 1 by themselves.

[0030] refer to Figure 1The support frame 2 includes a frame body 21, a support wheel 22, a floating frame 23 and a support spring 24. The frame body 21 is fixed on the upper surface of the moving seat 6, and a receiving chamber 25 is arranged inside the frame body 21. The floating frame 23 is connected to the receiving chamber 25 along the vertical sliding direction. At the same time, the support spring 24 is vertically arranged in the receiving chamber 25, and its lower end is fixed to the bottom of the receiving chamber 25, and the upper end is fixed to the lower part of the floating frame 23. The elastic force of the support spring 24 generates an upward force on the floating frame 23. Two support wheels 22 are arranged on each floating frame 23, and the two support wheels 22 are arranged at intervals, and the axis of the support wheel 22 is parallel to the left and right direction of the test platform 1. The two support wheels 22 are arranged on the floating frame 23 to rotate around their own axes. The screw rod 4 is placed between the two support wheels 22, so that the screw rod 4 is supported on the two support wheels 22, and when the screw rod 4 rotates, the support wheel 22 also rotates. When the screw rod 4 bounces due to imbalance, the support spring 24 can adapt to the up and down movement of the floating frame 23. The imbalance of the screw rod 4 can be determined by detecting the up and down bounce amplitude of the floating frame 23. The highest position of the two support wheels 22 can be limited by the natural length of the support spring 24, or a vertical limit groove can be opened on the side wall of the frame 21 so that the rotating shaft of the support wheel 22 extends into the limit groove for limitation. In this way, after the screw rod 4 is lifted, the support wheel 22 can stop at the highest position to prevent it from falling off the frame 21.

[0031] refer to Figure 2The belt drive assembly 3 includes a mounting frame 31, a transmission belt 32, a fixed pulley 33 and a floating pulley 34. Two fixed pulleys 33 and two floating pulleys 34 are provided, and the mounting frame 31 is slidably connected in the T-slot 11. Two T-slots 11 are arranged at intervals and in parallel on the upper surface of the test platform 1, so that the mounting frame 31 can be stably connected in the two T-slots 11. The two fixed pulleys 33 are both rotatably connected to the lower part of the mounting frame 31, and their axes are parallel to the left and right directions of the test platform 1. The two floating pulleys 34 are located above the two fixed pulleys 33, and the distance between the two fixed pulleys 33 is greater than the distance between the two floating pulleys 34. The vertical plane at the middle position of the two support wheels 22 is a symmetry plane, and the center line of the screw 4 is on the symmetry plane. The two fixed pulleys 33 and the two floating pulleys 34 are symmetrically arranged about this symmetry plane, that is, the two fixed pulleys 33 are symmetrically arranged at the front and rear positions of the screw 4, and the two floating pulleys 34 are also symmetrically arranged at the front and rear positions of the screw 4. Two floating pulleys 34 are connected to the mounting frame 31 through an elastic adjustment component 7, and the elastic adjustment component 7 can adjust the positions of the two floating pulleys 34 at the same time. The transmission belt 32 passes through the two fixed pulleys 33 and the two floating pulleys 34 in turn for transmission connection, and passes through the screw rod 4 between the two floating pulleys 34. When the two floating pulleys 34 are tensioned by the elastic adjustment component 7, the transmission belt 32 will also abut against the side wall of the screw rod 4 downward. A driving motor 35 is connected to a fixed pulley 33, and the driving motor 35 is fixed to the mounting frame 31. The output shaft of the driving motor 35 is coaxially fixed with the connected fixed pulley 33. The driving motor 35 can be a servo motor or a stepping motor to realize its forward and reverse rotation function. When the driving motor 35 rotates forward, the screw rod 4 can be driven to rotate through the transmission belt 32.

[0032] refer to Figure 2, an inclined groove 311 is provided on the mounting frame 31, and two inclined grooves 311 are symmetrically arranged about the symmetry plane. An adjusting shaft 36 is provided at the center of the floating pulley 34, and the end of the adjusting shaft 36 is inserted into the inclined groove 311. The two inclined grooves 311 are arranged in an inverted eight-shaped or inverted V-shaped manner, and the length direction of the inclined groove 311 can be perpendicular to the connecting line from the screw rod 4 to the fixed pulley 33. When the adjusting shaft 36 of the floating pulley 34 moves downward along the inclined groove 311, the floating pulley 34 can squeeze the transmission belt 32 between the screw rod 4 and the fixed pulley 33 in the tensioning direction. The elastic adjustment component 7 includes a horizontal cross bar 71 and an elastic member 72, wherein the elastic member 72 is a tension spring. Guide rails 73 are provided at both ends of the horizontal cross bar 71, and the guide rails 73 are vertically arranged so that the horizontal cross bar 71 can slide vertically through the guide rails 73. The guide rails 73 are fixed on the mounting frame 31. The length direction of the horizontal cross bar 71 is perpendicular to the screw rod 4, and a horizontal groove 74 is provided on the horizontal cross bar 71. The opening position of the horizontal groove 74 is within the height range of the inclined groove 311 to ensure that the end of the adjustment shaft 36 can be inserted into the horizontal groove 74 and the inclined groove 311 at the same time. One end of the elastic member 72 is fixed on the horizontal cross bar 71, and the other end is fixed on the mounting frame 31. An elastic member 72 can be fixed on each end of the horizontal cross bar 71, and the elastic force of the elastic member 72 is used to drive the horizontal cross bar 71 to move downward, thereby tensioning the transmission belt 32. When the screw rod 4 jumps up and down during the rotation process, the elastic member 72 can drive the two floating pulleys 34 to adjust at the same time, and the adjustment amplitudes on the front and rear sides of the screw rod 4 are the same. Such a structural design can enable the transmission belt 32 to stably drive the screw rod 4, and even compared with only setting the floating pulley 34 on one side, it can provide a more stable tensioning effect of the transmission belt 32, thereby reducing the possibility of instantaneous speed fluctuation of the screw rod 4 and ensuring the accuracy of detection. At the same time, when the screw rod 4 jumps, the two floating pulleys 34 can adjust the transmission belt 32 at the same time to maintain good contact between the transmission belt 32 and the screw rod 4.

[0033] refer to Figure 2In order to facilitate the removal of the screw rod 4 after the inspection, a lifting assembly 8 is also provided in the mounting frame 31. The function of the lifting assembly 8 is to lift the transmission belt 32 so that the position where the transmission belt 32 abuts against the screw rod 4 moves upward, thereby allowing the transmission belt 32 to break away from the restraint on the screw rod 4. The lifting assembly 8 includes a U-shaped frame 81, a guide rod 82, a connecting rod 83 and a driving bar 84. The opening of the U-shaped frame 81 faces upward, and rollers 85 are rotatably installed at both ends, and the rollers 85 are used to support the inner side of the transmission belt 32. The U-shaped frame 81 is located directly below the screw rod 4, and the two rollers 85 are symmetrically arranged on the front and rear sides of the screw rod 4. The guide rod 82 is vertically arranged, and the guide rod 82 passes through and can slide vertically on the horizontal cross bar 71. At the same time, the guide rod 82 can also be arranged to slide vertically on the mounting frame 31. The driving bar 84 is horizontally slidably connected to the mounting frame 31, and one end of the connecting rod 83 is rotatably connected to the lower end of the guide rod 82, and the other end is rotatably connected to the driving bar 84. Therefore, when the driving bar 84 slides horizontally, it can push and pull the guide rod 82 through the connecting rod 83, thereby adjusting the position of the guide rod 82 in the vertical direction. When the driving bar 84 drives the guide rod 82 to move upward, the U-shaped frame 81 can support the transmission belt 32 on both sides of the screw rod 4, so that the transmission belt 32 is lifted upward. At the same time, the two floating pulleys 34 will also move upward along the inclined groove 311.

[0034] refer to Figure 2 , a moving rack 91 is fixedly provided on the driving bar 84, and the moving rack 91 is parallel to the sliding direction of the driving bar 84. In the present embodiment, the moving rack 91 is arranged along the front-back direction of the test platform 1. A slide rail 92 is fixedly provided inside the mounting frame 31, and the driving bar 84 is slidably connected to the slide rail 92, so that it can move along the slide rail 92. At the same time, a driving gear 93 is also fixedly provided on the output shaft of the driving motor 35, and the driving gear 93 is connected to a driven gear 94 through a synchronous toothed belt transmission. A transmission gear 95 is coaxially fixedly provided on the driven gear 94, and the transmission gear 95 is meshed with the moving rack 91. The transmission gear 95 and the driven gear 94 are both rotatably connected to the mounting frame 31. Through the reverse rotation of the driving motor 35, the driving gear 93, the synchronous toothed belt, the driven gear 94 and the transmission gear 95 can be driven, thereby driving the driving bar 84 to slide. Therefore, after the screw 4 is inspected, the drive belt 32 can be automatically separated from the screw 4 by the reverse rotation of the drive motor 35, so that the inspected screw 4 can be conveniently removed. In addition, the drive motor 35 has an internal self-locking function, that is, when the drive motor 35 stops rotating, its drive shaft will no longer rotate. This function can keep the position of the drive belt 32 stable, so that the screw 4 can be smoothly inserted into the drive belt 32 when the screw 4 is inspected next time.

[0035] refer to Figure 2, a reset spring 96 is fixedly arranged on the driving bar 84. One end of the reset spring 96 is fixedly connected to the driving bar 84, and the other end is fixedly connected to the mounting bracket 31. The reset spring 96 is arranged parallel to the driving bar 84. When the driving motor 35 rotates forward, it will first drive the guide rod 82 downward through the driving gear 93, the synchronous toothed belt, the driven gear 94 and the transmission gear 95, so that the transmission belt 32 abuts against the screw 4. Until the moving rack 91 is completely separated from the transmission gear 95, the reset spring 96 is used to maintain the separation state of the moving rack 91 and the transmission gear 95, so as to prevent the moving rack 91 from contacting the transmission gear 95 when the driving motor 35 rotates forward to detect the screw 4. At the same time, a hand push rod 97 is also fixedly arranged on the driving bar 84. The push rod 97 is arranged parallel to the driving bar 84, and when the movable rack 91 is separated from the transmission gear 95, one end of the push rod 97 will extend out from the mounting frame 31, so that after the inspection of the screw rod 4 is completed, the staff can push the push rod 97 to make the movable rack 91 mesh with the transmission gear 95 again, so that the driving motor 35 can drive the lifting assembly 8 when it reverses.

[0036] The working process of this embodiment is as follows: First, after the screw rod 4 is placed on the two support wheels 22, the drive motor 35 starts to rotate in the forward direction. At this time, under the action of the downward movement of the guide rod 82, the elastic adjustment component 7 will automatically pull the transmission belt 32 downward to the position abutting against the screw rod 4, so that the drive motor 35 can drive the screw rod 4 to rotate through the transmission belt 32. During the rotation of the screw rod 4, if the screw rod 4 jumps up and down, the elastic adjustment component 7 can correspondingly make the transmission belt 32 move with the screw rod 4 to ensure stable driving of the screw rod 4. When the screw rod 4 completes the detection, the drive motor 35 rotates in the opposite direction and drives the lifting component 8 to lift the transmission belt 32 located at the position of the screw rod 4 upward, so that the transmission belt 32 is separated from the screw rod 4. At this time, the screw rod 4 can be easily taken out, and it is also convenient to put the screw rod 4 in next time.

[0037] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A screw vacuum pump detection device, comprising a test platform, a belt drive assembly and support frames installed on the left and right sides of the test platform, a screw is placed between the two support frames, the support frame comprises two support wheels movably arranged in the vertical direction, the ends of the screw are supported on the two support wheels, characterized in that: The belt drive assembly includes a mounting frame, a drive belt, a fixed pulley, and a floating pulley; The mounting frame is provided with two inclined slots, which are symmetrically arranged at the front and rear sides of the screw rod, and the mounting frame is arranged on the test platform; Two fixed pulleys and two floating pulleys are provided and are symmetrically arranged on the front and rear sides of the screw rod, respectively. The two floating pulleys are located above the fixed pulleys, and at least one of the fixed pulleys is connected to a driving motor for driving the fixed pulley to rotate; The transmission belt passes through two fixed pulleys and two floating pulleys in sequence, and passes through a screw rod between the two floating pulleys. The two floating pulleys are provided with adjustment shafts, which are inserted into the inclined grooves. The two floating pulleys move symmetrically along the inclined groove through an elastic adjustment component arranged on the mounting frame, and tension the transmission belt.

2. A screw vacuum pump detection device according to claim 1, characterized in that: The elastic adjustment component includes a horizontal cross bar and an elastic member. The horizontal cross bar is vertically slidably connected to the mounting frame. A horizontal groove is opened on the horizontal cross bar. The opening position of the horizontal groove intersects with the oblique groove. The adjustment shaft is inserted into the intersection of the horizontal groove and the oblique groove. The elastic member is connected between the horizontal cross bar and the mounting frame, and is used to drive the horizontal cross bar to move vertically and tighten the transmission belt.

3. A screw vacuum pump detection device according to claim 2, characterized in that: A jacking assembly is arranged in the mounting frame, and the jacking assembly includes a U-shaped frame, a guide rod, a connecting rod and a driving bar. The U-shaped opening of the U-shaped frame faces upward, and the U-shaped frame is directly below the screw rod. The guide rod is slidably connected to the mounting frame, the upper end of the guide rod is fixedly connected to the U-shaped frame, the lower end of the guide rod is rotatably connected to one end of the connecting rod, the driving bar is horizontally slidably connected to the mounting frame, and the end of the connecting rod away from the guide rod is rotatably connected to the driving bar.

4. A screw vacuum pump detection device according to claim 3, characterized in that: A driving gear is coaxially fixed on the output shaft of the driving motor, the driving gear is connected to a driven gear through a synchronous toothed belt, a transmission gear is coaxially fixed on the driven gear, a moving rack along the front and rear direction of the test platform is fixed on the driving bar, and the transmission gear is meshed with the moving rack.

5. A screw vacuum pump detection device according to claim 4, characterized in that: A return spring is fixedly arranged on the driving bar. When the driving motor rotates in the reverse direction until the transmission gear and the moving rack are disengaged, the return spring maintains the position of the moving rack. A hand push rod for pushing the moving rack to engage with the transmission gear is fixedly arranged on the driving bar.

6. A screw vacuum pump detection device according to claim 1, characterized in that: A moving seat is arranged below the support frame, and the moving seat is connected to the test platform by sliding along the left-right direction. The support frame is connected to the test platform through the moving seat. A moving gear is rotatably arranged on the moving seat, and a worm wheel is coaxially arranged on the moving gear. The worm wheel is meshed with a worm, and the worm wheel is rotatably connected to the moving seat. A fixed rack is fixedly arranged on the test platform along the left-right direction, and the moving gear is meshed with the fixed rack.

7. A screw vacuum pump detection device according to claim 6, characterized in that: A limit assembly is provided on the support frame, and the limit assembly includes a left limit frame and a right limit frame. The left limit frame is fixed on the left support frame and abuts against the left end of the screw rod, and the right limit frame is fixed on the right support frame. A limit rod is threadedly connected to the right limit frame, and an abutment wheel is rotatably provided at the end of the limit rod for abutting against the end of the screw rod.

8. A screw vacuum pump detection device according to claim 7, characterized in that: The abutment position between the abutment wheel and the end of the screw is offset from the center line of the screw.

9. A screw vacuum pump detection device according to claim 1, characterized in that: The support frame also includes a frame body, a floating frame and a support spring. A accommodating cavity is arranged in the frame body. The floating frame is vertically slidably arranged in the accommodating cavity. The support spring is arranged in the accommodating cavity, and the upper end of the support spring is connected to the floating frame, and the lower end of the support spring is connected to the frame body. The two support wheels are rotatably connected to the floating frame.

10. A screw vacuum pump detection device according to claim 1, characterized in that: The length direction of the inclined groove is perpendicular to the connecting line between the screw rod and the fixed pulley.

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