A screw vacuum pump detection device

Abstract

The present invention relates to the technical field of vacuum pump detection, and particularly relates to a screw vacuum pump detection device, which includes 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 belt drive assembly includes a mounting frame, a transmission belt, a fixed pulley, and a floating pulley; two inclined grooves are formed on the mounting frame, and the two inclined grooves are symmetrically arranged on the front and rear sides of the screw. At least one fixed pulley is connected to a drive motor for driving the fixed pulley to rotate; the transmission belt sequentially passes through the two fixed pulleys and the two floating pulleys, and an adjustment shaft is arranged on the two floating pulleys; the two floating pulleys symmetrically move along the inclined grooves through an elastic adjustment assembly and tension the transmission belt. The present invention tensions the two floating pulleys on the front and rear sides of the screw through the elastic adjustment assembly, so that the driving of the transmission belt on the screw 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 detection device for a screw vacuum pump, aiming to solve the problem in the related art that during the detection of the vacuum pump, when the screw jumps, it is impossible to maintain good transmission with the belt.

[0006] A detection device for a screw vacuum pump according to the present invention includes 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 includes two support wheels movably arranged in the vertical direction, and the ends of the screw are supported on the two support wheels. The belt drive assembly includes a mounting frame, a transmission belt, fixed pulleys, and floating pulleys. Two inclined slots are formed in the mounting frame, and the two inclined slots are symmetrically arranged on the front and rear sides of the screw. 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. The two floating pulleys are located above the fixed pulleys. At least one fixed pulley is connected to a drive 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. Adjusting shafts are arranged on the two floating pulleys, and the adjusting shafts are inserted into the inclined slots. The two floating pulleys move symmetrically along the inclined slots through an elastic adjustment assembly arranged on the mounting frame to tension the transmission belt.

[0007] The effect is as follows: When it is necessary to detect the screw, the ends of the screw are 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 pulleys and the floating pulleys. At the same time, the transmission belt bypasses the screw at the position between the two floating pulleys. When the drive motor drives one fixed pulley to rotate, the transmission belt will also rotate accordingly. At the same time, under the action of the elastic adjustment assembly, the floating pulleys will move symmetrically along the inclined slots, so that the two floating pulleys simultaneously adjust the tension of the transmission belt. When the screw rotates under the action of the transmission belt and generates vertical jumping, the transmission belt connected to the screw can move up and down through the movement of the floating pulleys in the inclined slots, so as to ensure good transmission connection between the screw and the transmission belt. 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 amplitudes are the same. Therefore, when the screw jumps up and down, the transmission belt has the same contraction situation on both sides of the screw, so as to ensure stable driving of the transmission belt on the screw.

[0008] Preferably, the elastic adjustment assembly includes a horizontal cross bar and an elastic member. The horizontal cross bar is vertically slidably connected to the mounting frame. A horizontal slot is formed in the horizontal cross bar, and the position where the horizontal slot is formed intersects with the inclined slot. The adjusting shaft is inserted into the position where the horizontal slot intersects with the inclined slot. The elastic member is connected between the horizontal cross bar and the mounting frame for driving the horizontal cross bar to move vertically and tension the transmission belt.

[0009] The effect is as follows: a horizontal groove is formed in the horizontal cross bar, and the adjusting shaft is inserted from the intersection position of the horizontal groove and the inclined groove. In this way, when the horizontal cross bar moves in the vertical direction, it can drive the two floating pulleys to move simultaneously, and the moving amplitudes of the two are the same, so as to ensure the same tensioning effect on the transmission belts on both sides of the screw rod.

[0010] Preferably, a jacking assembly is arranged in the mounting frame. The jacking assembly includes a U-shaped frame, a guide rod, a connecting rod and a driving strip. The opening of the U-shaped frame in the shape of a U faces upward, and the U-shaped frame is located 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 strip 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 strip.

[0011] The effect is as follows: the U-shaped frame is fixed on the guide rod. When the driving strip moves horizontally, the driving strip 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 rod to move upward together, so that the transmission belts are separated from the screw rod. This is convenient for removing the screw rod and also facilitates the installation of the screw rod next time.

[0012] Preferably, a driving gear is coaxially and fixedly arranged 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 and fixedly arranged on the driven gear. A moving rack along the front-back direction of the test platform is fixedly arranged on the driving strip. The transmission gear meshes with the moving rack.

[0013] The effect is as follows: when the driving motor rotates in the reverse direction, it can drive the moving rack in sequence through the driving gear, the driven gear and the transmission gear, so that the driving strip can move along the front-back direction of the test platform. In this way, the position of the transmission belt can be adjusted, so as to realize that the driving motor automatically disengages or contacts the transmission belt from the screw rod.

[0014] Preferably, a return spring is fixedly arranged on the driving strip. When the driving motor rotates in the reverse direction until the transmission gear disengages from the moving rack, the return spring keeps the position of the moving rack. A hand push rod for pushing the moving rack to mesh with the transmission gear is fixedly arranged on the driving strip.

[0015] The effect is as follows: when the transmission gear disengages from the moving rack, the return spring will keep the position of the moving rack, so as to ensure that when the driving motor rotates in the forward direction, the transmission gear will not accidentally contact the moving rack. At this time, the moving rack can be meshed with the transmission gear again through the hand push rod, so that the moving rack can be driven smoothly when the driving motor rotates in the reverse direction.

[0016] Preferably, a moving seat is arranged below the support frame. The moving seat is slidably connected to the test platform in 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. A worm gear is coaxially arranged on the moving gear. The worm gear meshes with a worm. The worm is rotatably connected to the moving seat. A fixed rack is fixedly arranged on the test platform in the left-right direction. The moving gear meshes with the fixed rack.

[0017] The effect is as follows: A rotating moving gear is arranged on the moving seat. By rotating the worm, the worm will drive the worm gear to rotate together. Since the worm gear is coaxially and fixedly connected to the moving gear, they will rotate simultaneously. In this way, the moving seat can move along the left-right direction of the test platform, so as to realize the adjustment of the distance between the two support frames, and further can adapt to and detect screws of different sizes.

[0018] Preferably, a limiting component is arranged on the support frame. The limiting component 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. A contact wheel for abutting against the end of the screw is rotatably arranged at the end of the limiting rod.

[0019] Preferably, the contact position of the contact wheel with the end of the screw deviates from the center line of the screw.

[0020] The effect is as follows: Rotating the limiting rod can change the position of the contact wheel so that the contact wheel abuts against the end of the screw. When the screw rotates, the contact wheel will rotate accordingly, thus 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 and prevent the screw from axially moving.

[0021] Preferably, the support frame further includes a frame body, a floating frame and a support spring. An accommodation cavity is arranged in the frame body. The floating frame is vertically slidably arranged in the accommodation cavity. The support spring is arranged in the accommodation cavity. 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. Two support wheels are rotatably connected to the floating frame.

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

[0023] By adopting the above technical solutions, the beneficial effects of the present invention are:

[0024] 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

[0025] Figure 1 It is a schematic diagram of the appearance of a screw vacuum pump detection device of the present invention;

[0026] Figure 2 It is a front view of a screw vacuum pump detection device of the present invention;

[0027] Figure 3 is a schematic diagram of the connection structure of the mobile base in an embodiment of the present invention;

[0028] Figure 4 is a structural diagram of the support frame on the right side of an embodiment of the present invention;

[0029] Figure 5 yes Figure 4 Sectional view in the AA direction;

[0030] Figure 6 is a schematic diagram of the connection structure of the support wheels in an embodiment of the present invention;

[0031] Figure 7 is a schematic diagram of the internal structure of the mounting frame in an embodiment of the present invention;

[0032] Figure 8 is a structural diagram of an elastic adjustment component in an embodiment of the present invention.

[0033] Reference numerals:

[0034] 1. Test platform; 11. T-shaped groove; 2. Support frame; 21. Frame body; 22. Support wheel; 23. Floating frame; 24. Support spring; 25. Accommodation cavity; 3. Belt drive assembly; 31. Mounting frame; 311. Inclined groove; 32. Transmission belt; 33. Fixed pulley; 34. Floating pulley; 35. Drive motor; 36. Adjusting shaft; 4. Screw; 5. Limit assembly; 51. Left limiting frame; 52. Right limiting frame; 53. Limiting rod; 54. Abutting wheel; 6. Moving seat; 61. Fixed rack; 62. Moving gear; 63. Worm gear; 64. Worm; 7. Elastic adjusting 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. Drive bar; 85. Roller; 91. Moving rack; 92. Slide rail; 93. Driving gear; 94. Driven gear; 95. Transmission gear; 96. Return spring; 97. Hand push rod. Detailed implementation manners

[0035] The following Figures 1 to 8 describes the embodiments of the present invention in detail. The examples of the embodiments are shown in the drawings. The embodiments described below by referring to the drawings are exemplary and are intended to explain the present invention, and should not be construed as a limitation to the present invention.

[0036] This embodiment discloses a screw vacuum pump detection device. As Figure 1 and Figure 2 shown, the device includes a test platform 1 and two support frames 2 installed on the test platform 1. These two support frames 2 are respectively located on the left and right sides of the test platform 1 and are symmetrically arranged to support the screw 4 so that both ends of the screw 4 are placed on the upper parts 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 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, an identification mark needs to be pasted on the side wall of the screw 4, and the sensor identifies the identification mark.

[0037] Refer to Figure 1 and Figure 2, a limit component 5 is arranged on the support frame 2. The limit component 5 includes a left limit frame 51 and a right limit frame 52. The left limit frame 51 is fixed on the left support frame 2, and the right limit frame 52 is fixed on the right support frame 2. 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 of the limit rod 53 abuts against the right end face of the screw rod 4. In addition, an abutting wheel 54 can be rotatably arranged at the end of the limit rod 53. The axis of the abutting wheel 54 is perpendicular to the limit rod 53, and the abutting wheel 54 is connected to the side wall of the limit rod 53, so that when the abutting wheel 54 abuts against the end of the screw rod 4, it is arranged offset 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 limited by the left limit frame 51 and the right limit frame 52 respectively, so that the position of the screw rod 4 in the axial direction is fixed. At the same time, the abutting wheel 54 rotates driven by the screw rod 4, which can avoid generating a loosening or tightening torque on the limit rod 53 when the screw rod 4 rotates, so as to ensure the axial positioning of the screw rod 4 by the limit component 5.

[0038] Reference Figure 1 , a moving seat 6 is fixedly arranged below the support frame 2, and the moving seat 6 is slidably connected to the test platform 1 in the left-right direction. A T-shaped groove 11 is formed on the upper surface of the test platform 1, and the length direction of the T-shaped groove 11 extends along the left-right direction of the test platform 1. A T-shaped block is arranged below the moving seat 6, and the T-shaped block is slidably connected in the T-shaped groove 11, so that the moving seat 6 can slide along the T-shaped groove 11. At the same time, a fixed rack 61 is fixedly arranged on the upper surface of the test platform 1, and the fixed rack 61 is arranged parallel to the length direction of the T-shaped groove 11. A moving gear 62 is rotatably arranged inside each moving seat 6, and the moving gear 62 is located at the lower part of the moving seat 6 and corresponds to the position of the fixed rack 61. When the moving seat 6 is connected to the test platform 1, the moving gear 62 meshes with the fixed rack 61. A worm gear 63 is coaxially and fixedly connected to the moving gear 62, and the worm gear 63 meshes with a worm 64. The worm 64 is rotatably connected to the moving seat 6, and one end of the worm 64 extends out from the side wall of the moving seat 6, which is convenient for the staff to rotate the worm 64. When the worm 64 is rotated, the worm 64 drives the worm gear 63 to rotate, and the worm gear 63 then drives the moving gear 62 to roll on the fixed rack 61, so as to realize the movement of the support frame 2 along the left-right direction of the test platform 1 by the moving seat 6. In this way, screws 4 of different length dimensions can be tested, and due to the self-locking effect of the worm 64 and the worm gear 63, the two support frames 2 will not move along the test platform 1 by themselves.

[0039] Reference Figure 1, the support frame 2 includes a frame body 21, support wheels 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 an accommodation cavity 25 is provided inside the frame body 21. The floating frame 23 is slidably connected to the accommodation cavity 25 in the vertical direction. At the same time, the support spring 24 is vertically arranged in the accommodation cavity 25, with its lower end fixed to the bottom of the accommodation cavity 25 and its upper end fixed to the lower part of the floating frame 23. The elastic force of the support spring 24 exerts an upward force on the floating frame 23. Two support wheels 22 are arranged on each floating frame 23, the two support wheels 22 are spaced apart, and the axis of the support wheel 22 is parallel to the left-right direction of the test platform 1. The two support wheels 22 are rotatably arranged on the floating frame 23 around their own axes. A screw rod 4 is placed at the position 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 wheels 22 also rotate accordingly. When the screw rod 4 jumps due to imbalance, the support spring 24 can adapt to the up and down movement of the floating frame 23. The imbalance amount of the screw rod 4 can be judged by detecting the up and down jump 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 limiting groove can be opened on the side wall of the frame body 21, so that the rotating shaft of the support wheel 22 extends into the limiting groove for limitation. In this way, after the screw rod 4 is lifted, the support wheels 22 can stop at the highest position to prevent them from disengaging from the frame body 21.

[0040] Reference Figure 2, the belt drive assembly 3 includes a mounting bracket 31, a drive belt 32, a fixed pulley 33, and a floating pulley 34. There are two fixed pulleys 33 and two floating pulleys 34. The mounting bracket 31 is slidably connected in the T-shaped groove 11. Two T-shaped grooves 11 are arranged at intervals and in parallel on the upper surface of the test platform 1, so that the mounting bracket 31 can be stably connected in the two T-shaped grooves 11. The two fixed pulleys 33 are both rotatably connected to the lower part of the mounting bracket 31, and their axes are parallel to the left-right direction 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 exact middle position of the two support wheels 22 is the 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 with respect to this symmetry plane, that is, the two fixed pulleys 33 are symmetrically arranged in the front and rear positions of the screw 4, and the two floating pulleys 34 are also symmetrically arranged in the front and rear positions of the screw 4. The two floating pulleys 34 are connected to the mounting bracket 31 through an elastic adjustment assembly 7, and the elastic adjustment assembly 7 can adjust the positions of the two floating pulleys 34 simultaneously. The drive belt 32 is sequentially wound around the two fixed pulleys 33 and the two floating pulleys 34 for drive connection, and passes through the screw 4 between the two floating pulleys 34. When the two floating pulleys 34 are tensioned by the elastic adjustment assembly 7, the drive belt 32 will also abut against the side wall of the screw 4 downward. A drive motor 35 is connected to one of the fixed pulleys 33, and the drive motor 35 is fixed on the mounting bracket 31. The output shaft of the drive motor 35 is coaxially and fixedly arranged with the connected fixed pulley 33. The drive motor 35 can be a servo motor or a stepper motor to achieve its forward and reverse functions. When the drive motor 35 rotates forward, the screw 4 can be driven to rotate through the drive belt 32.

[0041] Reference 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.

[0042] refer to Figure 2, To facilitate the removal of the inspected screw 4, a jacking assembly 8 is further provided within the mounting frame 31. The function of the jacking assembly 8 is to jack up the drive belt 32, causing the position where the drive belt 32 abuts against the screw 4 to move upward, thereby enabling the drive belt 32 to release its restraint on the screw 4. The jacking assembly 8 includes a U-shaped frame 81, guide rods 82, connecting rods 83, and a drive bar 84. The opening of the U-shaped frame 81 faces upward, and rollers 85 are rotatably installed at both ends thereof. The rollers 85 are used to support the inner side of the drive belt 32. The U-shaped frame 81 is located directly below the screw 4, and the two rollers 85 are symmetrically arranged on the front and rear sides of the screw 4 respectively. The guide rods 82 are vertically arranged, penetrate through and can slide vertically on the horizontal crossbar 71. At the same time, the guide rods 82 can also be arranged to slide vertically on the mounting frame 31. The drive bar 84 is horizontally slidably connected to the mounting frame 31. 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 drive bar 84. Therefore, when the drive 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 drive bar 84 drives the guide rod 82 to move upward, the U-shaped frame 81 can support the drive belt 32 on both sides of the screw 4, causing the drive belt 32 to lift upward. At the same time, the two floating pulleys 34 will also move upward along the inclined groove 311.

[0043] Reference Figure 2 , A moving rack 91 is fixedly provided on the drive bar 84. The moving rack 91 is parallel to the sliding direction of the drive bar 84. In this embodiment, the moving rack 91 is arranged along the front-rear direction of the test platform 1. A slide rail 92 is fixedly provided inside the mounting frame 31. The drive bar 84 is slidably connected to the slide rail 92 and can thus move along the slide rail 92. At the same time, a driving gear 93 is fixedly provided on the output shaft of the driving motor 35. The driving gear 93 is drivingly connected to a driven gear 94 through a synchronous toothed belt. The driven gear 94 is coaxially fixedly provided with a transmission gear 95. The transmission gear 95 meshes with the moving rack 91. Both the transmission gear 95 and the driven gear 94 are rotatably connected to the mounting frame 31. By reversely rotating the driving motor 35, the driving gear 93, synchronous toothed belt, driven gear 94, and transmission gear 95 can be driven, thereby driving the drive bar 84 to slide. Therefore, after the screw 4 is inspected, the drive belt 32 can be automatically separated from the screw 4 by reversely rotating the driving motor 35, facilitating the removal of the inspected screw 4. In addition, the driving motor 35 has an internal self-locking function, that is, when the driving motor 35 stops rotating, its drive shaft will no longer rotate. This function can keep the position of the drive belt 32 stable, facilitating the smooth insertion of the screw 4 into the drive belt 32 during the next inspection of the screw 4.

[0044] Reference Figure 2, a return spring 96 is fixedly arranged on the drive bar 84. One end of the return spring 96 is fixedly connected to the drive bar 84, and the other end is fixedly connected to the mounting bracket 31. The return spring 96 is arranged parallel to the drive bar 84. When the drive motor 35 rotates forward, it will first drive the guide rod 82 to move downward through the transmission of the driving gear 93, the synchronous belt, the driven gear 94 and the transmission gear 95, so that the transmission belt 32 abuts against the screw rod 4. Until the moving rack 91 is completely separated from the transmission gear 95, at this time, the return spring 96 is used to maintain the separated state of the moving rack 91 and the transmission gear 95, preventing the moving rack 91 from contacting the transmission gear 95 when the drive motor 35 rotates forward to detect the screw rod 4. At the same time, a hand push rod 97 is also fixedly arranged on the drive bar 84. The hand push rod 97 is arranged parallel to the drive bar 84, and after the moving rack 91 is separated from the transmission gear 95, one end of the hand push rod 97 will extend out of the mounting bracket 31, which is convenient for the staff to push the hand push rod 97 to make the moving rack 91 mesh with the transmission gear 95 again after the detection of the screw rod 4 is completed, so that the drive motor 35 can drive the lifting assembly 8 when it rotates in reverse.

[0045] 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 forward. At this time, under the action of the downward movement of the guide rod 82, the elastic adjustment assembly 7 will automatically pull the transmission belt 32 downward to the position where it abuts 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 assembly 7 can correspondingly make the transmission belt 32 move with the screw rod 4 to ensure the stable drive of the screw rod 4. After the detection of the screw rod 4 is completed, the drive motor 35 rotates in reverse and drives the lifting assembly 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 conveniently taken out, and it is also convenient to put the screw rod 4 in next time.

[0046] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those of ordinary skill in the art can make changes, modifications, substitutions and variations to 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 transmission belt, a fixed pulley and a floating pulley; two inclined grooves are provided on the mounting frame, and 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 adjusting shafts, and the adjusting shafts are inserted into the inclined grooves; the two floating pulleys are symmetrically moved along the inclined grooves by the elastic adjustment assembly arranged on the mounting frame, and the transmission belt is tensioned; 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 strip, and the U-shaped frame is The U-shaped opening faces upward, and the U-shaped frame is directly below the screw, 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; a driving gear is coaxially fixed on the output shaft of the driving motor, the driving gear is connected to the driven gear through a synchronous toothed belt, and the driven gear is coaxially fixed with a transmission gear, and 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; a reset spring is fixed on the driving bar, and when the driving motor rotates in the opposite direction until the transmission gear and the moving rack are disengaged, the reset spring maintains the position of the moving rack, and a hand push rod for pushing the moving rack to engage with the transmission gear is fixed on the driving bar.

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 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.

4. A screw vacuum pump detection device according to claim 3, 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.

5. A screw vacuum pump detection device according to claim 4, 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.

6. 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.

7. 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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