High-speed smooth electromagnetic linear feeder

Abstract

The application provides a high-speed stable electromagnetic linear feeder. The high-speed stable electromagnetic linear feeder comprises a supporting table, a shock absorber is installed on the top of the supporting table, and a feeding hopper is movably sleeved on the top of the shock absorber. The high-speed stable electromagnetic linear feeder provided by the application is provided with a driving mechanism. When the amplitude of the feeder vibration needs to be greatly adjusted, the rotating motor is started to drive the first toothed belt wheel to rotate through the second toothed belt wheel, so that the threaded column is rotated. At this time, the two threaded columns drive the first electromagnetic vibrator to reciprocate through the first sliding block, the first electromagnetic vibrator drives the driving chuck to be sleeved in the first clamping groove, the operation is repeated, the rotating motor drives the second electromagnetic vibrator to reciprocate, and the driving chuck is driven to move out of the second clamping groove, so that the replacement and alternation of the two groups of electromagnetic vibrators are achieved, and the universality of the linear feeder in the use environment is greatly improved.

Description

Technical Field

[0001] This invention relates to the field of electromagnetic linear feeders, and more particularly to a high-speed, stable electromagnetic linear feeder. Background Technology

[0002] A linear feeder is an auxiliary device for automated assembly machinery, primarily achieving automated feeding through electromagnetic vibration. The working effect of a linear feeder mainly depends on the combination of an electromagnet and a spring plate. In existing installation methods, the different installation angles of the electromagnet and the spring plate prevent the forces generated by them from maintaining a relative balance. This can easily lead to unstable feeding force and affect the operating efficiency of the equipment. Furthermore, the asymmetry of forces can cause the spring plate to break easily, and the electromagnet's high energy consumption reduces its lifespan.

[0003] In existing technologies, such as the Chinese patent application CN107720132B entitled "A Linear Feeder," a mounting base plate, two side panels, and an aviation socket are included. Two sets of elastic components are connected to the mounting base plate by screws. A support beam and a track mounting template are respectively connected to the two sets of elastic components by screws. The track mounting template is located above the support beam, with one end protruding from the connection point between the elastic components and the track mounting template. An adjusting bracket is connected to the support beam by screws, and an electromagnet is welded to the adjusting bracket. The electromagnet is connected to the aviation socket via an electrical wire. A magnetic block is connected to the track mounting template by screws. The adjusting bracket, electromagnet, and magnetic block are on the same axis, with a gap between the electromagnet and the magnetic block. Mounting holes are correspondingly provided on the support beam and side panels. The two side panels are fixedly connected to both sides of the support beam by screws and mounting holes. The aviation socket is fixed to one of the side panels. The linear feeder of this invention ensures the feeding stability of the product and improves the product's operating efficiency.

[0004] When using electromagnetic feeders in existing technologies, the fixed size of the electromagnetic feeder means that the vibration amplitude can only be controlled by the input current, resulting in extremely limited vibration adjustment range. This leads to low efficiency in conveying large-volume materials. Furthermore, when the electromagnetic feeder is supported by a single spring plate, the feeding track is prone to disordered fluctuations, resulting in low material conveying stability.

[0005] Therefore, it is necessary to provide a high-speed, stable electromagnetic linear feeder to solve the above-mentioned technical problems. Summary of the Invention

[0006] To solve the above-mentioned technical problems, the present invention provides a high-speed and stable electromagnetic linear feeder, including a support platform, a shock absorber installed on the top of the support platform, a feeding hopper movably sleeved on the top of the shock absorber, a vibrating beam fixedly connected to the bottom of the feeding hopper, a first slot on one side of the vibrating beam, a second slot on the other side of the vibrating beam, a first sliding groove on the top of the support platform, and a second sliding groove on the top of the support platform. A first sliding block is movably sleeved inside the first sliding groove, and a second sliding block is movably sleeved inside the second slot. A first electromagnetic vibrator is fixedly installed on the top of the sliding block, a second electromagnetic vibrator is fixedly installed on the top of the second sliding block, a drive clamp is fixedly connected to the top of the first electromagnetic vibrator, a drive mechanism is provided at the bottom of the support platform, a positioning seat is fixedly connected to the top of the support platform, a spring is movably sleeved on the top of the positioning seat, a support block is movably sleeved on the top of the spring, a positioning groove is opened on one side of the bottom of the inner cavity of the feeding hopper, a sorting screen is movably sleeved inside the positioning groove, an auxiliary mechanism is provided on one side of the feeding hopper, and a moving mechanism is provided at the bottom of the support platform.

[0007] The driving mechanism includes a threaded column, which is threadedly sleeved inside the first sliding block. One end of the threaded column is fixedly sleeved with a first toothed pulley. A rotary motor is fixedly installed at the bottom of the support platform. A second toothed pulley is fixedly sleeved on the output shaft of the rotary motor. The first toothed pulley and the second toothed pulley are connected by a toothed belt drive.

[0008] Preferably, the first sliding block is adapted to the first sliding groove, and the front shape of the first sliding groove is I-shaped, and the number of the first sliding blocks is two.

[0009] Preferably, the support blocks and positioning seats are symmetrically distributed about the spring as the axis of symmetry, and the support blocks are fixedly connected to the bottom of the feeding hopper, and the number of support blocks is six.

[0010] Preferably, the shock absorbers are perpendicular to the feed hopper, and there are six shock absorbers evenly distributed below the feed hopper.

[0011] Preferably, the drive card head is adapted to the first card slot, the front shape of the drive card head is T-shaped, and the material of the drive card head is chromium-nickel alloy.

[0012] Preferably, the sorting screen is adapted to the positioning groove, and the sorting screen is made of stainless steel.

[0013] Preferably, the auxiliary mechanism includes a magnet block that is fixedly sleeved on one side of the bottom of the inner cavity of the feeding hopper, the magnet block is tightly adsorbed on the bottom of the sorting screen, and an anti-slip groove is provided on one side of the top of the sorting screen.

[0014] Preferably, the length of the first slot is half the width of the vibration beam, and the length of the first slot is the same as the length of the second slot.

[0015] Preferably, the moving mechanism includes a support column, which is fixedly connected to the bottom of the support platform, and a sliding wheel is installed at the bottom of the support column.

[0016] Compared with related technologies, the high-speed and stable electromagnetic linear feeder provided by the present invention has the following beneficial effects:

[0017] This invention provides a high-speed, stable electromagnetic linear feeder. By setting up a drive mechanism, when a significant adjustment of the feeder's vibration amplitude is required, a rotary motor is started. This rotary motor drives two toothed pulleys (number one) to rotate via a second toothed pulley and a toothed belt, thereby rotating two threaded columns. At this time, the two threaded columns drive a first electromagnetic vibrator to reciprocate through a first sliding block. This causes the first electromagnetic vibrator to move and engage the drive clamp head inside the first slot. Then, a rotary motor on the other side of the support platform is started, causing a second electromagnetic vibrator to reciprocate and move the drive clamp head out of the second slot. This achieves the alternating effect of two sets of electromagnetic vibrators, allowing for the replacement of electromagnetic vibrators of different specifications. This facilitates a significant adjustment of the feeder's vibration amplitude and greatly improves the versatility of the linear feeder in various application environments.

[0018] By setting up a shock absorber, when the No. 1 electromagnetic vibrator drives the feeding hopper to vibrate through the vibrating beam, the shock absorber can limit and dampen the shaking feeding hopper, thus avoiding the problem of the feeding hopper shaking on both sides when the driving force of the No. 1 electromagnetic vibrator is uneven. This allows the feeding hopper to maintain stable up and down vibration, thus preventing the material inside the feeding hopper from moving to both sides during conveying, thereby improving the stability of material conveying in a straight line.

[0019] By setting up a sorting screen, when materials are being conveyed in a straight line, the sorting screen is fitted inside the positioning slot, allowing the sorting screen to screen the materials being conveyed inside the hopper. This allows smaller materials to pass through the sorting screen and fall, thus achieving the screening effect during the straight-line conveying of materials and improving the functionality of the electromagnetic linear feeder. Attached Figure Description

[0020] Figure 1 A schematic diagram of a preferred embodiment of a high-speed, stable electromagnetic linear feeder provided by the present invention;

[0021] Figure 2 for Figure 1The image shows a bottom view of the vibrating beam in a high-speed, stable electromagnetic linear feeder.

[0022] Figure 3 for Figure 1 The image shows a side view of the support platform in a high-speed, stable electromagnetic linear feeder.

[0023] Figure 4 for Figure 1 The image shows a front view of the feeding hopper in a high-speed, stable electromagnetic linear feeder.

[0024] Figure 5 for Figure 1 The image shows a front view of the drive mechanism in a high-speed, stable electromagnetic linear feeder.

[0025] Figure 6 for Figure 1 The image shows a top view of the support platform in a high-speed, stable electromagnetic linear feeder.

[0026] Figure 7 for Figure 1 The image shows a front view of a high-speed, stable electromagnetic linear feeder.

[0027] The diagram is labeled as follows: 1. Support platform; 2. Shock absorber; 3. Feed hopper; 4. Vibrating beam; 5. No. 1 slot; 6. No. 2 slot; 7. No. 1 sliding groove; 8. No. 2 sliding groove; 9. No. 1 sliding block; 10. No. 2 sliding block; 11. No. 1 electromagnetic vibrator; 12. No. 2 electromagnetic vibrator; 13. Drive chuck; 14. Drive mechanism; 141. Threaded column; 142. No. 1 toothed belt pulley; 143. Rotary motor; 144. No. 2 toothed belt pulley; 15. Positioning seat; 16. Spring; 17. Support block; 18. Positioning groove; 19. Sorting screen; 20. Auxiliary mechanism; 201. Magnet block; 202. Anti-slip groove; 21. Moving mechanism; 211. Support column; 212. Sliding wheel. Detailed Implementation

[0028] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0029] Please refer to the following: Figure 1-7A high-speed, stable electromagnetic linear feeder includes a support platform 1. A shock absorber 2 is mounted on the top of the support platform 1. A feeding hopper 3 is movably sleeved on the top of the shock absorber 2. A vibrating beam 4 is fixedly connected to the bottom of the feeding hopper 3. A first slot 5 is opened on one side of the vibrating beam 4, and a second slot 6 is opened on the other side. A first sliding groove 7 and a second sliding groove 8 are opened on the top of the support platform 1. A first sliding block 9 is movably sleeved inside the first sliding groove 7, and a second sliding block 10 is movably sleeved inside the second slot 6. An electromagnetic vibrator 11 is fixedly mounted on the top of the first sliding block 9, and the second sliding block 10... A second electromagnetic vibrator 12 is fixedly installed on the top of the support platform 1. A drive chuck 13 is fixedly connected to the top of the first electromagnetic vibrator 11. A drive mechanism 14 is provided at the bottom of the support platform 1. A positioning seat 15 is fixedly connected to the top of the support platform 1. A spring 16 is movably sleeved on the top of the positioning seat 15. A support block 17 is movably sleeved on the top of the spring 16. A positioning groove 18 is opened on one side of the bottom of the inner cavity of the feeding hopper 3. A sorting screen 19 is movably sleeved inside the positioning groove 18. An auxiliary mechanism 20 is provided on one side of the feeding hopper 3. A moving mechanism 21 is provided at the bottom of the support platform 1. The drive mechanism 14 includes a threaded column 141, which is threadedly sleeved... Inside the first sliding block 9, one end of the threaded post 141 is fixedly sleeved with a first toothed pulley 142. A rotary motor 143 is fixedly installed at the bottom of the support platform 1. A second toothed pulley 144 is fixedly sleeved on the output shaft of the rotary motor 143. The first toothed pulley 142 and the second toothed pulley 144 are connected by a toothed belt drive. By setting the drive mechanism 14, when a large adjustment of the feeder vibration amplitude is required, the rotary motor 143 is started, so that the rotary motor 143 drives the two first toothed pulleys 142 to rotate through the second toothed pulley 144 and the toothed belt, that is, drives the two threaded posts 141 to rotate. At this time, the two threaded posts 141 rotate. The column 141 drives the first electromagnetic vibrator 11 to reciprocate through the first sliding block 9, causing the first electromagnetic vibrator 11 to drive the drive clamp 13 to move and fit into the first clamp slot 5. At this time, the rotary motor 143 on the other side of the support platform 1 is started, so that the rotary motor 143 drives the second electromagnetic vibrator 12 to reciprocate and then drives the drive clamp 13 to move out of the second clamp slot 6. This achieves the effect of alternating the two sets of electromagnetic vibrators, that is, the effect of changing electromagnetic vibrators of different specifications. This brings convenience to the large-scale adjustment of the vibration amplitude of the feeder, thereby greatly improving the versatility of the linear feeder in various environments.

[0030] The first sliding block 9 is adapted to the first sliding groove 7, and the front shape of the first sliding groove 7 is I-shaped, and there are two first sliding blocks 9. By setting the first sliding block 9, when the first sliding block 9 moves, the first sliding groove 7 can limit the movement of the first sliding block 9, that is, limit the movement of the first electromagnetic vibrator 11. This avoids the problem that the drive chuck 13 is difficult to accurately enter the first chuck 5 when the position of the first electromagnetic vibrator 11 deviates during movement, thereby improving the stability when replacing the electromagnetic vibrator.

[0031] The support block 17 and the positioning seat 15 are symmetrically distributed about the spring 16 as the axis of symmetry. The support block 17 is fixedly connected to the bottom of the feeding hopper 3, and there are six support blocks 17. By setting the support block 17, when the spring 16 is replaced, the shock absorber 2 is disassembled and the feeding hopper 3 is lifted, so that the feeding hopper 3 can drive the support block 17 and remove the top of the spring 16. This allows the spring 16 to be quickly removed from the top of the positioning seat 15, which facilitates the disassembly of the spring 16 and the replacement of the spring 16.

[0032] The shock absorbers 2 are perpendicular to the feeding hopper 3, and there are six shock absorbers 2 evenly distributed below the feeding hopper 3. By setting the shock absorbers 2, when the first electromagnetic vibrator 11 drives the feeding hopper 3 to vibrate through the vibrating beam 4, the shock absorbers 2 can limit and dampen the shaking of the feeding hopper 3, thus avoiding the problem of the feeding hopper 3 shaking on both sides due to uneven driving force of the first electromagnetic vibrator 11. This allows the feeding hopper 3 to maintain stable up and down vibration, thus preventing the material inside the feeding hopper 3 from moving to both sides during conveying, thereby improving the stability of the material during linear conveying.

[0033] The drive head 13 is adapted to the first slot 5. The front of the drive head 13 is T-shaped and made of chromium-nickel alloy. By setting the drive head 13, when the first electromagnetic vibrator 11 drives the vibration beam 4 to vibrate through the drive head 13, the drive head 13 can protect the drive end of the first electromagnetic vibrator 11. This avoids the problem of rapid wear of the output end of the first electromagnetic vibrator 11 when it vibrates inside the first slot 5 for a long time, thereby improving the service life of the first electromagnetic vibrator 11, that is, improving the service life of the electromagnetic linear feeder.

[0034] The sorting screen 19 is adapted to the positioning groove 18, and the sorting screen 19 is made of stainless steel. By setting the sorting screen 19, when the material is being conveyed in a straight line, the sorting screen 19 is fitted inside the positioning groove 18, so that the sorting screen 19 can screen the material being conveyed inside the feeding hopper 3, allowing smaller materials to fall through the sorting screen 19, thereby achieving the screening effect during the material conveying in a straight line, and thus improving the functionality of the electromagnetic linear feeder.

[0035] The auxiliary mechanism 20 includes a magnet block 201. The magnet block 201 is fixedly sleeved on one side of the bottom of the inner cavity of the feeding hopper 3. The magnet block 201 is tightly adsorbed on the bottom of the sorting screen 19. An anti-slip groove 202 is provided on one side of the top of the sorting screen 19. By setting the auxiliary mechanism 20, when the sorting screen 19 is installed, the sorting screen 19 is horizontally inserted into the positioning groove 18, so that the magnet block 201 can adsorb and fix the sorting screen 19, thereby fixing the sorting screen 19 inside the positioning groove 18. At this time, pushing the anti-slip groove 202 allows the sorting screen 19 to be moved out of the positioning groove 18, thus facilitating the disassembly of the sorting screen 19.

[0036] The length of slot 5 is half the width of the vibrating beam 4, and the length of slot 5 is the same as that of slot 6. By setting slot 5, when the electromagnetic vibrator 11 drives the drive head 13 to move, slot 5 can limit the movement of the drive head 13, so that the drive head 13 stops when it moves to one end of slot 5, and stops when it moves directly under the vibrating beam 4. This avoids the problem of drive force deviation when the working position of the drive head 13 is offset.

[0037] The moving mechanism 21 includes a support column 211, which is fixedly connected to the bottom of the support platform 1. A sliding wheel 212 is installed at the bottom of the support column 211. By setting the moving mechanism 21, when the linear feeder needs to move and convey, the support platform 1 is pushed, so that the sliding wheel 212 can drive the support platform 1 to move horizontally through the support column 211, that is, drive the feeding hopper 3 to move horizontally, thereby achieving the moving and conveying effect of the electromagnetic linear feeder, and thus bringing convenience to the adjustment of the working position of the electromagnetic linear feeder.

[0038] The working principle of the high-speed and stable electromagnetic linear feeder provided by this invention is as follows:

[0039] When a significant adjustment of the feeder vibration amplitude is required, the rotary motor 143 is activated. This motor, via the second toothed pulley 144 and the toothed belt, drives the two first toothed pulleys 142 to rotate, which in turn drives the two threaded posts 141 to rotate. The two threaded posts 141 then drive the first electromagnetic vibrator 11 to reciprocate via the first sliding block 9. This causes the first electromagnetic vibrator 11 to move the drive chuck 13 and engage it inside the first slot 5. Simultaneously, the rotary motor 143 on the other side of the support platform 1 is activated. This motor drives the second electromagnetic vibrator 12 to reciprocate, thereby moving the drive chuck 13 out of the second slot 6. This achieves the alternating effect of the two sets of electromagnetic vibrators, thus realizing… The replacement of electromagnetic vibrators of different specifications facilitates the significant adjustment of the feeder's vibration amplitude, thereby greatly improving the versatility of the linear feeder in various environments. When the first sliding block 9 moves, the first sliding groove 7 limits its movement, thus limiting the movement of the first electromagnetic vibrator 11. This prevents the drive chuck 13 from failing to accurately enter the first slot 5 when the first electromagnetic vibrator 11 shifts position, improving the stability during vibrator replacement. When replacing the spring 16, the shock absorber 2 is disassembled and the feeding hopper 3 is lifted, allowing the feeding hopper 3 to move the support block 17, thereby removing the top of the spring 16 and allowing it to quickly move from its fixed position. The removal of the top of the seat 15 facilitates the disassembly and replacement of the spring 16. When the first electromagnetic vibrator 11 drives the feeding hopper 3 to vibrate via the vibrating beam 4, the shock absorber 2 limits and dampens the swaying feeding hopper 3, preventing the feeding hopper 3 from swaying due to uneven driving force of the first electromagnetic vibrator 11. This ensures that the feeding hopper 3 maintains stable up-and-down vibration, preventing the material inside the feeding hopper 3 from moving to the sides during conveying, thus improving the stability of linear material conveying. When the first electromagnetic vibrator 11 drives the vibrating beam 4 to vibrate via the drive clamp 13, the drive clamp 13 protects the drive end of the first electromagnetic vibrator 11. This avoids the problem of rapid wear at the output end of the No. 1 electromagnetic vibrator 11 when it vibrates for a long time inside the No. 1 slot 5, thus improving the service life of the No. 1 electromagnetic vibrator 11, and consequently the service life of the electromagnetic linear feeder. During linear material conveying, the sorting screen 19 is fitted inside the positioning slot 18, allowing it to screen the material moving inside the feeding hopper 3. Smaller materials can pass through the sorting screen 19, achieving the screening effect during linear material conveying and improving the functionality of the electromagnetic linear feeder. When installing the sorting screen 19, it is horizontally inserted into the positioning slot 18, allowing the magnet block 201 to attract and fix the sorting screen 19.This allows the sorting screen 19 to be fixed inside the positioning groove 18. Pushing the anti-slip groove 202 then allows the sorting screen 19 to move out of the positioning groove 18, facilitating its disassembly. When the first electromagnetic vibrator 11 drives the drive chuck 13 to move, the first chuck groove 5 limits its movement, stopping the drive chuck 13 at one end of the groove 5. This prevents the drive chuck 13 from shifting its working position and causing a deviation in driving force. When linear feeder movement is required, pushing the support platform 1 causes the sliding wheel 212 to move horizontally via the support column 211, thus moving the feeding hopper 3 horizontally. This achieves the electromagnetic linear feeder's movement and facilitates adjustment of its working position.

[0040] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A high-speed, stable electromagnetic linear feeder, comprising a support platform (1), characterized in that: A shock absorber (2) is installed on the top of the support platform (1). A feeding hopper (3) is movably sleeved on the top of the shock absorber (2). A vibrating beam (4) is fixedly connected to the bottom of the feeding hopper (3). A first slot (5) is opened on one side of the vibrating beam (4), and a second slot (6) is opened on the other side of the vibrating beam (4). A first sliding groove (7) is opened on the top of the support platform (1), and a second sliding groove (8) is opened on the top of the support platform (1). A first sliding block (9) is movably sleeved inside the first sliding groove (7), and a second sliding block (10) is movably sleeved inside the second slot (6). A first electromagnetic vibrator (11) is fixedly installed on the top of the first sliding block (9). The top of the moving block (10) is fixedly installed with a second electromagnetic vibrator (12), the top of the first electromagnetic vibrator (11) is fixedly connected with a drive chuck (13), the bottom of the support platform (1) is provided with a drive mechanism (14), the top of the support platform (1) is fixedly connected with a positioning seat (15), the top of the positioning seat (15) is movably sleeved with a spring (16), the top of the spring (16) is movably sleeved with a support block (17), a positioning groove (18) is opened on one side of the bottom of the inner cavity of the feeding hopper (3), a sorting screen (19) is movably sleeved inside the positioning groove (18), an auxiliary mechanism (20) is provided on one side of the feeding hopper (3), and a moving mechanism (21) is provided at the bottom of the support platform (1). The drive mechanism (14) includes a threaded post (141), which is threadedly sleeved inside the first sliding block (9). One end of the threaded post (141) is fixedly sleeved with a first toothed pulley (142). A rotary motor (143) is fixedly installed at the bottom of the support platform (1). A second toothed pulley (144) is fixedly sleeved on the output shaft of the rotary motor (143). The first toothed pulley (142) and the second toothed pulley (144) are connected by a toothed belt drive.

2. The high-speed, stable electromagnetic linear feeder according to claim 1, characterized in that, The first sliding block (9) is adapted to the first sliding groove (7), and the front shape of the first sliding groove (7) is I-shaped, and the number of the first sliding blocks (9) is two.

3. The high-speed, stable electromagnetic linear feeder according to claim 1, characterized in that, The support block (17) and the positioning seat (15) are symmetrically distributed with the spring (16) as the axis of symmetry, and the support block (17) is fixedly connected to the bottom of the feeding hopper (3), and the number of support blocks (17) is six.

4. The high-speed, stable electromagnetic linear feeder according to claim 1, characterized in that, The shock absorbers (2) are perpendicular to each other and the feeding hopper (3), and there are six shock absorbers (2) evenly distributed below the feeding hopper (3).

5. A high-speed, stable electromagnetic linear feeder according to claim 1, characterized in that, The drive card head (13) is adapted to the first card slot (5). The front shape of the drive card head (13) is T-shaped, and the material of the drive card head (13) is chromium-nickel alloy.

6. A high-speed, stable electromagnetic linear feeder according to claim 1, characterized in that, The sorting screen (19) is adapted to the positioning groove (18), and the sorting screen (19) is made of stainless steel.

7. A high-speed, stable electromagnetic linear feeder according to claim 1, characterized in that, The auxiliary mechanism (20) includes a magnet block (201). The magnet block (201) is fixedly sleeved on one side of the bottom of the inner cavity of the feeding hopper (3). The magnet block (201) is tightly adsorbed on the bottom of the sorting screen (18). An anti-slip groove (202) is provided on one side of the top of the sorting screen (18).

8. A high-speed, stable electromagnetic linear feeder according to claim 1, characterized in that, The length of the first slot (5) is half the width of the vibration beam (4), and the length of the first slot (5) is the same as the length of the second slot (6).

9. A high-speed, stable electromagnetic linear feeder according to claim 1, characterized in that, The moving mechanism (21) includes a support column (211), which is fixedly connected to the bottom of the support platform (1), and a sliding wheel (212) is installed at the bottom of the support column (211).

Images