A device for steadily screening belts of equal length by gravity

Abstract

The device disclosed in the present invention for smoothly screening equal-length belts by gravity comprises a platform, a cylinder, a linear rail slider assembly, a small pulley, a large pulley and a weight. The lower part of the large centering shaft is mounted in the large connecting plate through an axial hole. A pressure gauge plate is fixed on the side of the large connecting plate. A dial indicator or a position sensor is fixed on the top of the platform. The large connecting plate is fixedly connected to the slider. The driving shaft fixed at the front end of the piston rod comprises a front limit section, a middle section and a rear limit section. A driving block is fixed on the large connecting plate. The driving handle at the lower part of the driving block is sleeved on the outer side of the middle section. One end of the chain is fixed on the chain fixing block, and the other end droops naturally and fixes the weight. The device can convert the tension force of the belt during use into the gravity of the weight, so as to prevent impact, smoothly measure and screen equal-length belts. The device is easy to operate and the screening results are reliable. By changing the position of the small connecting plate and the size of the weight, the measurement and screening of belts of different specifications can be achieved.

Description

Technical Field

[0001] The invention relates to a belt screening device, in particular to a device for steadily screening belts of equal length by relying on gravity. Background Art

[0002] Belt drive is a common transmission method on CNC machine tools. For example, the power of the motor is transmitted to the machine tool spindle through the belt. Belts in CNC machine tools are mostly used in groups, and the length of a group of belts must be consistent to ensure the torque transmission effect. Belts are purchased from machine tool manufacturers and must be screened for equal length before installation on CNC machine tools. That is, the circumference of the belt is measured by a tape measure in a natural state. Because it is difficult for the tape measure to fit the belt completely during measurement, and it is quite different from the actual use state, the length consistency of the grouped belts screened by this equal length screening method is not good, which leads to poor motor torque transmission effect during use after installation. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a device for stably screening belts of equal length by gravity, which is simple to operate and has reliable screening results, in view of the deficiencies of the prior art.

[0004] The technical solution adopted by the present invention to solve the above technical problems is: a device for smoothly screening equal-length belts by gravity, comprising a platform, a cylinder, a linear rail slider assembly, a small pulley, a large pulley and a weight, the cylinder and the linear rail slider assembly are respectively horizontally mounted on the top of the platform, the small pulley is mounted on the rear side of the top of the platform through a small centering shaft arranged upright, a small tray is fixed to the bottom of the small pulley, the large pulley is mounted on the front side of the top of the platform through a large centering shaft arranged upright, a large tray is fixed to the bottom of the large pulley, the lower part of the large centering shaft is mounted in the large connecting plate through an axial hole, a pressure gauge plate is fixed on the side of the large connecting plate, a dial indicator or a position sensor is fixed on the top of the platform, the dial indicator or the position sensor is located in front of the pressure gauge plate, the large connecting plate is fixedly connected to the slider of the linear rail slider assembly, the cylinder The piston rod is arranged parallel to the linear rail of the linear rail slider assembly, and a reversing valve for controlling the telescopic action of the piston rod is installed on the platform. A pushing shaft is coaxially fixed to the front end of the piston rod, and the pushing shaft includes a front limit segment, an intermediate segment and a rear limit segment which are arranged in sequence in a front-rear manner, and the outer diameter of the intermediate segment is smaller than the outer diameter of the front limit segment and the rear limit segment. A pushing block is fixed on the large connecting plate, and the lower part of the pushing block is a pushing handle, which is sleeved on the outer side of the intermediate segment and limited between the front limit segment and the rear limit segment. A chain fixing block is fixed on the front end of the large connecting plate, and a sprocket is installed on the platform. The chain fixing block is connected to the weight via a chain, and one end of the chain is fixed on the chain fixing block, and the other end of the chain naturally droops around the sprocket, and the weight is fixed to the other end of the chain.

[0005] The working principle of the device of the present invention is as follows: before measuring, the belt to be measured is placed on the outside of the large pulley and the small pulley, and the belt is supported by the large tray and the small tray; during measuring, by adjusting the extension speed of the piston rod, the front end face of the pushing handle is kept in contact with the rear end face of the front limit segment during the process in which the piston rod pushes the pushing handle through the pushing shaft, so that the pushing block, the large connecting plate, the large centering shaft, the large pulley and the large tray and other components move forward synchronously, the heavy object is controlled to fall smoothly, and the tensioning force of the belt during use is converted into the gravity of the heavy object. In the early stage of the falling of the heavy object, the front end face of the pushing handle is kept in contact with the rear end face of the front limit segment, and the heavy object reaches the preset position. After the belt is stationary, the piston rod continues to extend forward until the front end face of the push handle is disengaged from the rear end face of the front limit section. At this point, the belt is only affected by the gravity of the weight. The weight drags the large connecting plate, the push block, the large centering shaft, the large pulley and the large tray along the linear track through the chain to tighten the belt. During the belt tightening process, the pressure plate squeezes the dial gauge or the position sensor, causing the reading of the dial gauge to change or triggering the position sensor to send a signal. After the belt is stationary, the reading of the dial gauge or the signal of the position sensor is recorded, and the measurement is completed. After the measurement is completed, the piston rod retracts and the weight is pulled up. When the belt reaches a relaxed state, the belt can be removed. Repeat the above actions to measure the length of the next belt. Finally, compare the recorded values ​​to select belts of equal length.

[0006] The large and small pulleys are installed through the large and small centering shafts to ensure the consistency of the measured values ​​each time. The sprocket is conducive to the smooth movement of heavy objects.

[0007] For machine tool manufacturers, the measurement results of the dial indicator are intuitive; when using a position sensor, combined with electrical control, the belt length can be automatically measured, recorded and compared, achieving semi-automatic screening. For belt manufacturers, by adding mechanisms such as manipulators, fully automated grouping screening and testing of belt length can be achieved.

[0008] Preferably, an upright adjustment bolt is fixed to the other end of the chain, the adjustment bolt is threadedly connected to the weight, and the adjustment bolt is locked by a locking nut. By rotating and adjusting the adjustment bolt, the upper and lower positions of the weight can be fine-tuned to further ensure the accuracy of the measurement results.

[0009] Preferably, a support block is fixed to the rear side of the top of the platform, a small connecting plate is fixed to the top of the support block, the lower part of the small centering shaft is installed in the small connecting plate through the shaft hole, the small pulley is installed in the upper part of the small centering shaft, a small cover plate is fixed to the top of the small centering shaft, the small cover plate presses the small pulley downward, and an air path connected to the cylinder is provided in the support block to reduce exposure of the air pipe.

[0010] Preferably, threaded holes are processed at different positions on the top of the support block, and the small connecting plate is fixedly connected to the support block by screws. Threaded holes are processed at different positions on the top of the support block to facilitate changing the position of the small connecting plate and achieve measurement and screening of belts of different lengths.

[0011] Preferably, the large pulley is installed on the upper part of the large centering shaft, and a large cover plate is fixed on the top of the large centering shaft, and the large cover plate presses the large pulley downward.

[0012] Preferably, a limiting bracket is installed on the top of the platform, and the limiting bracket is used to limit the backward movement of the large connecting plate.

[0013] Preferably, the platform is mounted on a movable vehicle body, thereby facilitating movement of the vehicle body and achieving screening of belts of equal length at different locations.

[0014] Preferably, a limit cover is installed on the front side of the platform, and the weight is located inside the limit cover. When the weight moves up and down, the limit cover can limit the swing amplitude of the weight to ensure that the weight falls and rises steadily.

[0015] Compared with the prior art, the present invention has the following advantages: the device for smoothly screening equal-length belts by gravity adjusts the extension speed of the piston rod of the cylinder, controls the weight to fall steadily and stretches the belt steadily, and converts the tension during the use of the belt into the gravity of the weight, thereby achieving the purpose of preventing impact, smoothly measuring and screening equal-length belts. The device of the present invention is easy to operate and has more reliable results than other screening methods. By changing the position of the small connecting plate and the size of the weight, the measurement and screening of belts of different specifications can be achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a top view of the device in the embodiment;

[0017] Figure 2 It is a partial cross-sectional front view of the device in the embodiment;

[0018] Figure 3 for Figure 2 The enlarged image at point I in the middle;

[0019] Figure 4 To correspond to Figure 3 A view in which the middle portion is not cut away but the upper portion is cut away;

[0020] Figure 5 for Figure 4 Middle AA section view. DETAILED DESCRIPTION

[0021] The present invention is further described in detail below with reference to the accompanying drawings.

[0022] The embodiment of the device for smoothly screening belts of equal length by gravity, such as Figure 1~Figure 5 As shown, it includes a platform 1, a cylinder 2, a linear rail slider assembly 3, a small pulley 4, a large pulley 5 and a weight 6. The platform 1 is installed on a movable vehicle body 11. The cylinder 2 and the linear rail slider assembly 3 are respectively installed horizontally on the top of the platform 1. The small pulley 4 is installed on the rear side of the top of the platform 1 through a small centering shaft 41 arranged upright. A small tray 42 is fixed to the bottom of the small pulley 4. The large pulley 5 is installed on the front side of the top of the platform 1 through a large centering shaft 51 arranged upright. The bottom of the large pulley 5 is fixed There is a large tray 52, the lower part of the large centering shaft 51 is installed in the large connecting plate 55 through the shaft hole, a pressure gauge plate 53 is fixed on the side of the large connecting plate 55, a dial indicator 54 is fixed on the top of the platform 1, and the dial indicator 54 is located in front of the pressure gauge plate 53. The lower part of the large centering shaft 51 is installed in the large connecting plate 55 through the shaft hole. The large connecting plate 55 is fixedly connected to the slider of the linear rail slider assembly 3. The piston rod 21 of the cylinder 2 is arranged parallel to the linear rail of the linear rail slider assembly 3. The platform 1 is installed with The reversing valve 13 is used to control the telescopic action of the piston rod 21. The front end of the piston rod 21 is coaxially fixed with a driving shaft 22. The driving shaft 22 includes a front limit segment 23, a middle segment 24 and a rear limit segment 25 which are arranged in sequence in front and back. The outer diameter of the middle segment 24 is smaller than the outer diameters of the front limit segment 23 and the rear limit segment 25. A driving block 56 is fixed on the large connecting plate 55. The lower part of the driving block 56 is a driving handle 57. The driving handle 57 is sleeved on the outer side of the middle segment 24 and is limited to the front limit segment 23 and the rear limit segment 25. Between the limiting sections 25, a chain fixing block 58 is fixed to the front end of the large connecting plate 55, a sprocket 14 is installed on the platform 1, the chain fixing block 58 is connected to the weight 6 via the chain 7, one end of the chain 7 is fixed to the chain fixing block 58, the other end of the chain 7 is naturally drooped around the sprocket 14, and the weight 6 is fixed to the other end of the chain 7. Specifically, an upright adjusting bolt 71 is fixed to the other end of the chain 7, the adjusting bolt 71 is threadedly connected to the weight 6, and the adjusting bolt 71 is locked by a locking nut 72.

[0023] In this embodiment, a limiting bracket 12 is installed on the top of the platform 1, and the limiting bracket 12 is used to limit the backward movement of the large connecting plate 55; a limiting cover 15 is installed on the front side of the platform 1, and the weight 6 is located on the inner side of the limiting cover 15.

[0024] In this embodiment, a support block 16 is fixed to the rear side of the top of the platform 1, and threaded holes are processed at different positions of the top of the support block 16. A small connecting plate 43 is fixedly connected to the top of the support block 16 by screws, and the lower part of the small centering shaft 41 is installed in the small connecting plate 43 through the shaft hole, and the small pulley 4 is installed on the upper part of the small centering shaft 41. A small cover plate 44 is fixed on the top of the small centering shaft 41, and the small cover plate 44 presses the small pulley 4 downward. An air path connected to the cylinder 2 is provided in the support block 16; the large pulley 5 is installed on the upper part of the large centering shaft 51, and a large cover plate 59 is fixed on the top of the large centering shaft 51, and the large cover plate 59 presses the large pulley 5 downward.

[0025] In this embodiment, the dial gauge 54 can be replaced by a position sensor, and with the help of electrical control, the automatic measurement, recording and comparison of the belt length can be realized, thereby realizing semi-automatic screening. For belt manufacturers, by adding a manipulator and other mechanisms, fully automated grouping screening and detection of belt length can be realized.

[0026] Before measurement, the belt 8 to be measured is placed on the outside of the large pulley 5 and the small pulley 4, and the belt 8 is supported by the large tray 52 and the small tray 42; during measurement, by adjusting the extension speed of the piston rod 21, the front end face a of the pushing handle 57 is kept in contact with the rear end face b of the front limit segment 23 during the process in which the piston rod 21 pushes the pushing handle 57 through the pushing shaft 22, so that the pushing block 56, the large connecting plate 55, the large centering shaft 51, the large pulley 5 and the large tray 52 and other components move forward synchronously, and the weight 6 is controlled to fall smoothly, and the tensioning force of the belt 8 during use is converted into the gravity of the weight 6. In the early stage of the falling of the weight 8, the front end face a of the pushing handle 57 is kept in contact with the rear end face b of the front limit segment 23. After the weight 6 reaches the preset position and stops, the piston rod 21 continues to extend forward until the front end face a of the pushing handle 57 is disengaged from the rear end face b of the front limit segment 23 (such as Figure 4 As shown), at this point, the belt 8 is only affected by the gravity of the weight 6. The weight 6 drags the large connecting plate 55, the push block 56, the large centering shaft 51, the large pulley 5 and the large tray 52 along the linear track through the chain 7 to tighten the belt 8; during the tightening process of the belt 8, the pressure gauge plate 53 squeezes the dial gauge 54, causing the reading of the dial gauge 54 to change. After the belt 8 is stationary, the reading of the dial gauge 54 is recorded, and the measurement is completed; after the measurement is completed, the piston rod 21 retracts, the weight 6 is pulled up, and the belt 8 can be removed when it reaches a relaxed state. Repeat the above actions to measure the length of the next belt. Finally, compare the recorded values ​​to select belts of equal length.

[0027] The device is easy to operate and more reliable than the results of other screening methods. By changing the position of the small connecting plate 43 and the size of the weight 6, the measurement and screening of belts of different specifications can be realized.

Claims

1. A device for steadily screening belts of equal length by gravity, characterized in that: The present invention comprises a platform, a cylinder, a linear rail slider assembly, a small pulley, a large pulley and a weight, wherein the cylinder and the linear rail slider assembly are respectively horizontally mounted on the top of the platform, the small pulley is mounted on the rear side of the top of the platform through a small centering shaft arranged upright, a small tray is fixed to the bottom of the small pulley, the large pulley is mounted on the front side of the top of the platform through a large centering shaft arranged upright, a large tray is fixed to the bottom of the large pulley, the lower part of the large centering shaft is mounted in a large connecting plate through an axial hole, a pressure gauge plate is fixed to the side of the large connecting plate, a dial indicator or a position sensor is fixed to the top of the platform, the dial indicator or the position sensor is located in front of the pressure gauge plate, the large connecting plate is fixedly connected to the slider of the linear rail slider assembly, the piston rod of the cylinder is arranged parallel to the linear rail of the linear rail slider assembly A reversing valve for controlling the telescopic action of the piston rod is installed on the platform, a pushing shaft is coaxially fixed to the front end of the piston rod, the pushing shaft comprises a front limit section, an intermediate section and a rear limit section which are arranged integrally in sequence front and back, the outer diameter of the intermediate section is smaller than the outer diameters of the front limit section and the rear limit section, a pushing block is fixed to the large connecting plate, the lower part of the pushing block is a pushing handle, the pushing handle is sleeved on the outer side of the intermediate section and limited between the front limit section and the rear limit section, a chain fixing block is fixed to the front end of the large connecting plate, a sprocket is installed on the platform, the chain fixing block is connected to the weight via a chain, one end of the chain is fixed to the chain fixing block, the other end of the chain bypasses the sprocket and naturally droops, and the weight is fixed to the other end of the chain.

2. A device for steadily screening belts of equal length by gravity according to claim 1, characterized in that: The other end of the chain is fixed with an upright adjusting bolt, the adjusting bolt is threadedly connected with the weight, and the adjusting bolt is locked by a locking nut.

3. The device for screening belts of equal length by gravity according to claim 1, characterized in that: A support block is fixed to the rear side of the top of the platform, a small connecting plate is fixed to the top of the support block, the lower part of the small centering shaft is installed in the small connecting plate through the shaft hole, the small pulley is installed on the upper part of the small centering shaft, a small cover plate is fixed to the top of the small centering shaft, the small cover plate presses the small pulley downward, and an air path connected to the cylinder is provided in the support block.

4. The device for screening belts of equal length by gravity according to claim 3, characterized in that: Threaded holes are processed at different positions on the top of the support block, and the small connecting plate is fixedly connected to the support block by screws.

5. The device for screening belts of equal length by gravity according to claim 1, characterized in that: The large belt pulley is installed on the upper part of the large centering shaft, and a large cover plate is fixed on the top of the large centering shaft, and the large cover plate presses the large belt pulley downwards.

6. The device for screening belts of equal length by gravity according to claim 1, characterized in that: A limiting bracket is installed on the top of the platform, and the limiting bracket is used to limit the backward movement of the large connecting plate.

7. The device for screening belts of equal length by gravity according to claim 1, characterized in that: The platform is installed on a movable vehicle body.

8. The device for stably screening belts of equal length by gravity according to claim 1, characterized in that: A limiting cover is installed on the front side of the platform, and the heavy object is located on the inner side of the limiting cover.

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