A benchtop expandable laboratory bench

Abstract

The application relates to the field of experimental equipment, and particularly discloses an experimental operating table with an expandable table top, which comprises a table body and a water tank installed on the table body, the water tank is covered with a cover plate, a through hole communicating with the water tank is formed in the cover plate, and a mounting seat is fixedly arranged at the bottom of the cover plate; a plurality of rotating plates are rotatably arranged on the mounting seat, a first driving mechanism is further arranged on the mounting seat and used for driving the plurality of rotating plates to synchronously rotate, so that the rotating plates shield or open the through hole; a fixed plate is fixedly arranged on the upper end surface of the table body, a moving plate is slidingly arranged on the table body, a multistage telescopic mechanism and a fixing mechanism are arranged on the table body, the multistage telescopic mechanism is used for driving the moving plate to slide along the fixed plate; when the moving plate slides to one side of the fixed plate, the fixing mechanism is used for fixing the moving plate and making the upper end surface of the moving plate flush with the upper end surface of the fixed plate. The application can expand the table top of the experimental operating table, can provide a flexible working area, and can improve the space utilization of a laboratory.

Description

Technical Field

[0001] This application relates to the field of experimental equipment, and in particular to an experimental workbench with an expandable tabletop. Background Technology

[0002] Laboratory workbenches are common equipment in laboratories, mainly used to store various experimental instruments for researchers to perform experimental operations.

[0003] Existing laboratory workbenches generally use fixed-size work surfaces, which to some extent limits the efficiency and versatility of laboratory space utilization. Summary of the Invention

[0004] To address the issues of fixed dimensions and low space utilization in experimental workbenches, this application provides an experimental workbench with an expandable work surface.

[0005] The experimental workbench with an expandable tabletop provided in this application adopts the following technical solution:

[0006] An expandable experimental workbench includes:

[0007] A table, on which a sink is installed;

[0008] A cover plate is provided on the water tank. The cover plate has a through hole that communicates with the upper opening of the water tank. A mounting base is fixedly provided at the bottom of the cover plate.

[0009] Multiple rotating plates are rotatably mounted on the mounting base, and the multiple rotating plates are distributed at equal intervals along the circumference of the mounting base.

[0010] A first driving mechanism is used to drive the plurality of rotating plates to rotate synchronously, so that the rotating plates cover or open the through hole;

[0011] A fixing plate is fixedly installed on the upper surface of the table body;

[0012] A movable plate is slidably disposed on the upper end surface of the fixed plate;

[0013] A multi-stage telescopic mechanism is used to drive the movable plate to slide along the fixed plate;

[0014] A fixing mechanism is provided to fix the movable plate and make its upper surface flush with the upper surface of the fixed plate when the movable plate slides to one side of the fixed plate.

[0015] When the water tank is not in use, multiple rotating plates are driven synchronously by the first drive mechanism to cover the open end of the water tank, thereby increasing the usable area of ​​the tabletop. A multi-stage telescopic mechanism drives a movable plate to slide along a fixed plate, extending the movable plate from one side of the tabletop, further increasing the usable area. After the movable plate is extended, a fixing mechanism secures it, making its upper surface flush with the upper surface of the fixed plate, thus facilitating experimental operations on the movable plate. This application enables the expansion of the experimental workbench, providing a flexible working area and helping to improve the space utilization of the laboratory.

[0016] Furthermore, the first driving mechanism includes an external gear ring rotatably mounted on the mounting base and a plurality of connecting rods hinged to the external gear ring. Each of the plurality of connecting rods corresponds to a plurality of rotating plates, and the end of each connecting rod away from the external gear ring is hinged to the corresponding rotating plate. The mounting base is provided with a first driving member for driving the external gear ring to rotate.

[0017] The first driving component drives the outer gear ring to rotate, which in turn drives the connecting rod. The connecting rod pushes the corresponding rotating plate, and the rotating plate rotates to cover or open the opening end of the pool.

[0018] Furthermore, a fixed frame is fixedly connected to the bottom surface of the fixed plate, and the table body is fixedly provided with two symmetrically arranged first guide rails and two symmetrically arranged second guide rails. A first sliding frame is slidably arranged between the two first guide rails, and a second sliding frame is slidably arranged between the two second guide rails. A sliding bar is slidably arranged on the second sliding frame, and the end of the sliding bar is fixedly connected to the bottom of the movable plate. A second driving component for driving the first sliding frame to slide is provided on the fixed frame. The multi-stage telescopic mechanism includes a first driving component for driving the second sliding frame to slide synchronously with the first sliding frame and a second driving component for driving the sliding bar to slide synchronously with the second sliding frame.

[0019] The first sliding frame is driven to slide by the second driving component, the second sliding frame is driven to slide synchronously with the first sliding frame by the first driving component, and the sliding bar is driven to slide synchronously with the second sliding frame by the second driving component. In this way, the first sliding frame, the second sliding frame and the sliding bar can be extended and retracted synchronously, thereby driving the moving plate to extend or retract from the desktop.

[0020] Furthermore, the first drive assembly includes two sets of first synchronous pulleys rotatably mounted on the first sliding frame. Each set of first synchronous pulleys is tensioned and covered with a first synchronous belt. A first fixing block and a second fixing block are respectively fixed to opposite sides of the first synchronous belt. The first fixing block is fixed to the fixing frame, and the second fixing block is fixed to the second sliding frame.

[0021] When the second driving component drives the first sliding frame to slide, the relative motion between the first sliding frame and the fixed frame drives the first synchronous belt to rotate. The relative displacement between the first fixed block and the second fixed block is twice the relative displacement between the first sliding frame and the fixed frame. That is, the relative displacement between the second sliding frame and the fixed frame is twice the relative displacement between the first sliding frame and the fixed frame, thus amplifying the stroke.

[0022] Furthermore, the second drive assembly includes two sets of second synchronous pulleys rotatably mounted on the second sliding frame. Each set of second synchronous pulleys is tensioned and covered with a second synchronous belt. A third fixing block and a fourth fixing block are respectively fixed to opposite sides of the second synchronous belt. The third fixing block is fixed to the first sliding frame, and the fourth fixing block is fixed to the sliding bar.

[0023] The relative motion between the first and second sliding frames drives the second synchronous belt to rotate. The relative displacement between the third and fourth fixed blocks is twice the relative displacement between the first and second sliding frames. That is, the relative displacement between the sliding bar and the first sliding frame is twice the relative displacement between the first and second sliding frames, thus amplifying the stroke.

[0024] By amplifying the stroke through two stages between the first and second sliding frames and between the second sliding frame and the sliding bar, the first sliding frame only needs to be driven by the second driving component to slide a small distance to drive the moving plate to slide a large distance. This means that the second driving component installed inside the table does not require much space, which helps to save space inside the table.

[0025] Furthermore, the fixing mechanism includes a fixing seat fixed to the upper end face of the sliding bar, a card slidably disposed on the fixing seat, a sliding piece slidably disposed between the fixing seat and the card, the upper end of the sliding piece being fixed to the lower end face of the moving plate, and a fixing component for fixing the card being disposed on the fixing seat.

[0026] Furthermore, the slider has a first inclined surface on both sides, and the card has a first V-shaped groove on both sides that fits into the first inclined surface; the card has an adjustment groove on both sides, the adjustment groove including a straight groove extending vertically and a branch groove communicating with one side of the straight groove; the fixing assembly includes a locking block fixedly disposed in the adjustment groove and a swing rod rotatably connected to the fixing base; the free end of the swing rod is fixedly connected to an end head; the locking block has a second V-shaped groove for accommodating the end head; the inner wall of the adjustment groove is fixedly connected to a wedge block, the wedge block being disposed opposite to the second V-shaped groove; a tension spring is connected between the fixing base and the card.

[0027] Furthermore, a guide boss is provided at the connection between the straight groove and the branch groove to guide the end from the straight groove into the branch groove.

[0028] The slider is engaged with the first V-shaped groove on both sides, so that the slider and the card can move synchronously: when an external force is used to push the slider downward, the slider pushes the card to move downward in sync; when the card moves upward under the action of an external force, the card pushes the slider to move upward in sync.

[0029] When the movable plate extends out of the table along the surface of the fixed plate, the upper surface of the movable plate is higher than the upper surface of the fixed plate, and the end is located in the straight groove. The user presses down on the edge of the movable plate, causing the slider to push the card downward, while the end slides along the straight groove. When the end slides to the connection between the straight groove and the branch groove, the guide boss guides the end into the branch groove. When the end slides to the end of the branch groove, the user removes the external force of pressing the movable plate. Under the elastic force of the tension spring, the card moves upward, so that the end is locked in the second V-shaped groove, thus locking the card. At this time, the upper surface of the movable plate is flush with the upper surface of the fixed plate.

[0030] When the movable plate needs to be retracted to the desktop, the user presses down on the edge of the movable plate again. Under the guidance of the wedge block, the end slides out from the second V-groove and enters the straight groove. Under the elastic force of the tension spring, the card moves upward and pushes the slider to move upward in sync, causing the movable plate to move up. This makes the upper surface of the movable plate higher than the upper surface of the fixed plate. Then, the movable plate can be retracted through the multi-stage telescopic mechanism.

[0031] Furthermore, the surface of the guide boss that contacts the end head is inclined, and the card is provided with an adjustment component to keep the relative height between the end head and the fixed seat constant when the end head slides along the surface of the guide boss.

[0032] Furthermore, the adjustment assembly includes an adjustment rod hinged to both sides of the card. A slider and a protrusion are respectively fixed to both sides of the free end of the adjustment rod. An upper adjustment plate and a lower adjustment plate are fixedly arranged on the side of the fixed base. A gap is provided between the upper adjustment plate and the fixed base for the slider to slide. The adjustment rod abuts against the lower adjustment plate, and the protrusion abuts against the upper adjustment plate. A second inclined surface is provided on the side of the upper adjustment plate that contacts the protrusion. A third inclined surface is provided on the side of the adjustment rod that contacts the lower adjustment plate, and a fourth inclined surface is provided on the side of the lower adjustment plate that contacts the adjustment rod. The inclination of the second, third, and fourth inclined surfaces is consistent with the inclination of the guide boss surface.

[0033] When the card slides relative to the fixed seat, the end slides along the surface of the guide boss. During this process, the second inclined surface slides with the protrusion, and the third inclined surface slides with the fourth inclined surface, so that the relative height change between the card and the fixed seat offsets the inclination of the guide boss, thereby keeping the relative height between the end and the fixed seat constant. This can reduce the bending of the swing rod caused by the end sliding along the guide boss.

[0034] In summary, this application includes at least one of the following beneficial technical effects:

[0035] 1. The rotating plate is shielded from the water tank by the first drive mechanism, and the moving plate is extended out of the table by the multi-stage telescopic mechanism, which can realize the expansion of the experimental operating table, provide a flexible working area, and improve the space utilization of the laboratory.

[0036] 2. By using a multi-stage telescopic mechanism to achieve two-stage stroke amplification, only the second drive component needs to drive the first sliding frame to slide a small distance, which can drive the moving plate to slide a large distance. This means that the second drive component installed inside the table does not require much space, which helps to save space inside the table.

[0037] 3. After extending the movable plate, fix it in place using a fixing mechanism and make the upper surface of the movable plate flush with the tabletop, so that users can perform experimental operations on the movable plate. Attached Figure Description

[0038] Figure 1 This is a schematic diagram of the overall structure of an embodiment of this application;

[0039] Figure 2 This is a schematic diagram of the overall structure from another perspective of an embodiment of this application;

[0040] Figure 3 This is a partial structural schematic diagram of the mounting base, rotating plate and first drive mechanism in the embodiments of this application;

[0041] Figure 4 This is an overall schematic diagram of the multi-stage telescopic mechanism in the embodiments of this application;

[0042] Figure 5 This is an overall schematic diagram of the multi-stage telescopic mechanism from another angle in the embodiments of this application;

[0043] Figure 6 This is a partial schematic diagram of the fixed frame and the first sliding frame, mainly used to illustrate the embodiments of this application;

[0044] Figure 7 yes Figure 5 An enlarged schematic diagram of part A in the middle;

[0045] Figure 8This is a partial schematic diagram of the embodiments of this application, mainly used to illustrate the first sliding frame and the second sliding frame;

[0046] Figure 9 This is a partial schematic diagram in the embodiments of this application, mainly used to show the second sliding frame and the sliding bar;

[0047] Figure 10 This is a partial schematic diagram of the fixing mechanism in an embodiment of this application;

[0048] Figure 11 This is an exploded view of the fixing mechanism in the embodiments of this application;

[0049] Figure 12 This is an exploded view of the fixing mechanism from another angle in the embodiments of this application;

[0050] Figure 13 yes Figure 10 Enlarged schematic diagram of part B in the middle;

[0051] Figure 14 yes Figure 11 An enlarged schematic diagram of section C;

[0052] Figure 15 This is a partial schematic diagram of the fixing mechanism from another angle in an embodiment of this application;

[0053] Figure 16 yes Figure 15 An enlarged schematic diagram of section D in the middle;

[0054] Figure 17 This is a partial schematic diagram used to illustrate the adjustment component in the embodiments of this application.

[0055] Reference numerals: 1. Table body; 11. Cover plate; 111. Second arc-shaped groove; 12. Through hole; 13. Fixed plate; 14. Moving plate; 15. Receiving groove; 2. Mounting base; 21. Rotating plate; 22. External gear ring; 221. First arc-shaped groove; 222. Pulley; 23. Connecting rod; 24. Gear; 25. Limiting post; 26. First motor; 3. Multi-stage telescopic mechanism; 31. Fixed frame; 32. First sliding frame; 321. First synchronous pulley; 322. First synchronous belt; 323. First fixed block; 324. Second fixed block; 33. Second sliding frame; 331. Second synchronous pulley; 332. Second synchronous belt; 333. Third fixed block; 334. Fourth fixed block; 34. First guide rail; 35. Second guide rail; 36. Second motor; 361. Threaded rod; 37. Sliding bar; 38. Third guide rail; 39. Support plate; 4. Fixing mechanism; 41. Fixed seat; 411. Upper adjusting plate; 4111. Second inclined surface; 412. Lower adjusting plate; 4121. Fourth inclined surface; 413. Limiting block; 42. Card; 421. First V-groove; 422. Adjusting groove; 4221. Straight groove; 4222. Branch groove; 423. Locking block; 4231. Second V-groove; 424. Guide boss; 425. Adjusting rod; 4251. Slider; 4252. Protrusion; 4253. Third inclined surface; 426. Wedge block; 427. Sliding groove; 43. Sliding piece; 431. First inclined surface; 44. Tension spring; 45. Swing rod; 451. End. Detailed Implementation

[0056] The following is in conjunction with the appendix Figure 1-17 This application will be described in further detail.

[0057] This application discloses an expandable experimental workbench. (Refer to...) Figure 1 and Figure 2 The expandable experimental workbench includes a table body 1, a fixed plate 13 fixedly mounted on the upper surface of the table body 1, and a movable plate 14 slidably mounted on the upper surface of the fixed plate. A receiving groove 15 is provided on one side of the table body 1, and a multi-stage telescopic mechanism 3 is provided in the receiving groove 15 to drive the movable plate 14 to slide along the fixed plate 13.

[0058] Reference Figure 1 and Figure 2 The bottom of the movable plate 14 is provided with a fixing mechanism 4. When the movable plate 14 slides to one side of the fixed plate 13, the fixing mechanism 4 is used to fix the movable plate 14 and make the upper end surface of the movable plate 14 flush with the upper end surface of the fixed plate 13.

[0059] Reference Figure 1 and Figure 3A water tank is installed on the table body 1, and a cover plate 11 is provided on the water tank. The cover plate 11 has a through hole 12, which communicates with the upper opening of the water tank. A mounting base 2 is fixedly provided at the bottom of the cover plate 11, and multiple rotating plates 21 are rotatably mounted on the mounting base 2. The multiple rotating plates 21 are distributed at equal intervals along the circumference of the mounting base 2. The mounting base 2 is provided with a first driving mechanism, which is used to drive the multiple rotating plates 21 to rotate synchronously, so that the rotating plates 21 cover or open the through hole 12.

[0060] When the water tank is not in use, multiple rotating plates 21 are driven to rotate synchronously by the first drive mechanism, covering the open end of the water tank and thus increasing the usable area of ​​the tabletop. The moving plate 14 is driven to slide along the fixed plate 13 by the multi-stage telescopic mechanism 3, allowing the moving plate 14 to extend from one side of the tabletop, further increasing the usable area. After the moving plate 14 is extended, it is fixed by the fixing mechanism 4, making its upper surface flush with the upper surface of the fixed plate 13, i.e., the upper surface of the moving plate 14 is flush with the tabletop, facilitating experimental operations on the moving plate 14. This application enables the expansion of the experimental workbench, providing a flexible working area and helping to improve the space utilization of the laboratory.

[0061] Reference Figure 3 The mounting base 2 is a hollow cylinder. The first driving mechanism includes an external gear ring 22 rotatably mounted on the mounting base 2 and coaxial with the mounting base 2. Multiple spaced limiting posts 25 are fixed to the mounting base 2. Multiple first arc-shaped grooves 221 are formed on the external gear ring 22 for the limiting posts 25 to slide. Multiple connecting rods 23 are sequentially hinged to the external gear ring 22 along its circumference. Each connecting rod 23 corresponds to a different rotating plate 21. The end of each connecting rod 23 furthest from the external gear ring 22 is hinged to the corresponding rotating plate 21. The rotating plate 21 has a triangular cross-sectional profile with each side being arc-shaped; the sides at the hinge point between the rotating plate 21 and the connecting rod 23 are convex arc-shaped, while the remaining side is concave arc-shaped.

[0062] Reference Figure 3 The mounting base 2 is provided with a first driving component for driving the external gear ring 22 to rotate. Specifically, the first driving component is a first motor 26 mounted on the mounting base 2 and a gear 24 connected to the output end of the first motor 26. The gear 24 meshes with the external gear ring 22.

[0063] Furthermore, refer to Figure 1 and Figure 3 A lever 222 is fixed to the upper end face of the external gear ring 22, and a second arc-shaped groove 111 for the lever to slide is provided on the cover plate 11.

[0064] The first motor 26 drives the gear 24 to rotate, which in turn drives the outer gear ring 22 to rotate. The outer gear ring 22 drives the connecting rod 23, which in turn pushes the corresponding rotating plate 21, causing multiple rotating plates 21 to rotate simultaneously. When the free end of the rotating plate 21 moves toward the center of the mounting base 2, the multiple rotating plates 21 interlock, covering the opening end of the sink, thus expanding the work surface area. When the free end of the rotating plate 21 moves away from the center of the mounting base 2, the opening end of the sink opens. Alternatively, the outer gear ring 22 can be manually rotated by moving the lever 222, thus opening and closing the sink.

[0065] To cause the movable plate 14 to extend or retract from one side of the desktop, refer to... Figure 2 , Figure 4 and Figure 5 A fixing frame 31 is fixedly connected to the bottom surface of the fixing plate 13. Two symmetrically arranged first guide rails 34 and two symmetrically arranged second guide rails 35 are fixedly installed on the bottom wall of the receiving groove 15 on one side of the table body 1. A first sliding frame 32 is slidably arranged between the two first guide rails 34, and a second sliding frame 33 is slidably arranged between the two second guide rails 35. A sliding strip 37 is slidably arranged on the second sliding frame 33, and the end of the sliding strip 37 is fixedly connected to the bottom of the moving plate 14.

[0066] Reference Figure 4 and Figure 5 The fixed frame 31 is provided with a second driving component for driving the first sliding frame 32 to slide. Specifically, the second driving component includes a threaded rod 361 threaded through the first sliding frame 32 and a second motor 36 mounted on the fixed frame 31 for driving the threaded rod 361 to rotate. The multi-stage telescopic mechanism 3 includes a first driving assembly for driving the second sliding frame 33 to slide synchronously with the first sliding frame 32 and a second driving assembly for driving the sliding bar 37 to slide synchronously with the second sliding frame 33.

[0067] The second motor 36 drives the threaded rod 361 to rotate, thereby causing the first sliding frame 32 to slide. The first drive assembly drives the second sliding frame 33 to slide synchronously with the first sliding frame 32, and the second drive assembly drives the sliding bar 37 to slide synchronously with the second sliding frame 33. In this way, the first sliding frame 32, the second sliding frame 33 and the sliding bar 37 can be extended and retracted synchronously, thereby causing the movable plate 14 to extend or retract from the tabletop.

[0068] Specifically, refer to Figure 6 , Figure 7 and Figure 8The first drive assembly includes two sets of first synchronous pulleys 321 rotatably mounted on the first sliding frame 32. Each set of first synchronous pulleys 321 has two pulleys. Each set of first synchronous pulleys 321 is tensioned and covered with a first synchronous belt 322. A first fixing block 323 and a second fixing block 324 are fixed to opposite sides of the first synchronous belt 322, respectively. The first fixing block 323 is fixed to the fixing frame 31, and the second fixing block 324 is fixed to the second sliding frame 33.

[0069] Reference Figure 8 and Figure 9 The second drive assembly includes two sets of second synchronous pulleys 331 rotatably mounted on the second sliding frame 33. Each set of second synchronous pulleys 331 has two pulleys. Each set of second synchronous pulleys 331 is tensioned and covered with a second synchronous belt 332. A third fixing block 333 and a fourth fixing block 334 are fixed to opposite sides of the second synchronous belt 332, respectively. The third fixing block 333 is fixed to the first sliding frame 32, and the fourth fixing block 334 is fixed to the sliding bar 37.

[0070] When the second motor 36 drives the threaded rod 361 to rotate, thereby driving the first sliding frame 32 to slide, the relative movement between the first sliding frame 32 and the fixed frame 31 drives the first synchronous belt 322 to rotate. The relative displacement between the first fixed block 323 and the second fixed block 324 is twice the relative displacement between the first sliding frame 32 and the fixed frame 31. That is, the relative displacement between the second sliding frame 33 and the fixed frame 31 is twice the relative displacement between the first sliding frame 32 and the fixed frame 31, thus achieving stroke amplification.

[0071] Furthermore, the relative motion between the first sliding frame 32 and the second sliding frame 33 drives the second synchronous belt 332 to operate, and the relative displacement between the third fixed block 333 and the fourth fixed block 334 is twice the relative displacement between the first sliding frame 32 and the second sliding frame 33. That is, the relative displacement between the sliding bar 37 and the first sliding frame 32 is twice the relative displacement between the first sliding frame 32 and the second sliding frame 33, thus further amplifying the stroke.

[0072] By amplifying the stroke through two stages between the first sliding frame 32 and the second sliding frame 33, and between the second sliding frame 33 and the sliding bar 37, the first sliding frame 32 only needs to be driven to slide a small distance by the second motor 36 and the threaded rod 361 to drive the moving plate 14 to slide a large distance. This means that the second motor 36 and the threaded rod 361 inside the table body 1 do not require much installation space, which helps to save space inside the table body 1.

[0073] Reference Figure 4The fixed frame 31 is provided with third guide rails 38 on both sides, and side plates 39 are slidably mounted on the third guide rails 38. When the movable plate 14 slides to one side of the table, the side plates 39 slide out along the third guide rails 38. The side plates 39 support the movable plate 14 and help improve the stability of the movable plate 14.

[0074] When the movable plate 14 slides along the upper surface of the fixed plate 13 to the edge of the table body 1, the upper surface of the movable plate 14 is higher than the upper surface of the fixed plate 13. In order to facilitate the user to carry out experimental operations on the table, the upper surface of the movable plate 14 needs to be adjusted to be flush with the upper surface of the fixed plate 13. For this purpose, the present application provides a fixing mechanism 4.

[0075] Specifically, refer to Figure 10 , Figure 11 and Figure 12 The fixing mechanism 4 includes a fixing seat 41 fixed to the upper end face of the sliding bar 37, and a card 42 slidably disposed on the fixing seat 41 in the vertical direction; specifically, a limit block 413 is fixedly disposed on the fixing seat 41, and a sliding groove 427 for the limit block 413 to slide in the vertical direction is formed on the card 42. A sliding piece 43 is slidably disposed between the fixing seat 41 and the card 42, the upper end of the sliding piece 43 is fixed to the lower end face of the moving plate 14, and a fixing component for fixing the card 42 is provided on the fixing seat 41.

[0076] Reference Figure 11 The slider 43 has a first inclined surface 431 on both sides, and the card 42 has a first V-shaped groove 421 on both sides that is adapted to the first inclined surface 431.

[0077] The two sides of the slider 43 are engaged in the first V-groove 421, so that the slider 43 and the card 42 can move synchronously: when an external force is used to push the slider 43 downward, the slider 43 pushes the card 42 to move downward synchronously; when the card 42 moves upward under the action of an external force, the card 42 pushes the slider 43 to move upward synchronously.

[0078] Reference Figure 10 and Figure 11 A tension spring 44 connects the fixing base 41 and the card 42. The upper end of the tension spring 44 is fixed to the fixing base 41, and the lower end is fixed to the card 42. (See reference) Figure 11 , Figure 13 and Figure 14The card 42 has adjustment slots 422 on both sides. The adjustment slots 422 include a straight slot 4221 extending in the vertical direction and a branch slot 4222 connected to one side of the straight slot 4221. The fixing component includes a locking block 423 fixedly disposed in the adjustment slot 422 and a swing rod 45 rotatably connected to the fixing base 41. The free end of the swing rod 45 is fixedly connected to an end head 451, which is slidably disposed in the adjustment slot 422. The locking block 423 has a second V-shaped groove 4231 for accommodating the end head 451.

[0079] Reference Figure 13 and Figure 14 A wedge-shaped block 426 is fixed to the inner wall of the adjusting groove 422, and the wedge-shaped block 426 is arranged opposite to the second V-shaped groove 4231; the tip of the wedge-shaped block 426 is located on the side of the rocker arm 45 away from the straight groove 4221. A guide boss 424 is provided at the connection between the straight groove 4221 and the branch groove 4222 to guide the end 451 from the straight groove 4221 into the branch groove 4222.

[0080] When the movable plate 14 extends out of the table along the surface of the fixed plate 13, the upper surface of the movable plate 14 is higher than the upper surface of the fixed plate 13, and the end 451 is located in the straight groove 4221. The user presses down on the edge of the movable plate 14, causing the slider 43 to push the card 42 downward, while the end 451 slides along the straight groove 4221. When the end 451 slides to the connection between the straight groove 4221 and the branch groove 4222, the guide boss 424 guides the end 451 into the branch groove 4222. When the end 451 continues to slide to the end of the branch groove 4222, the user removes the external force of pressing the movable plate 14. Under the elastic force of the tension spring 44, the card 42 moves upward, causing the end 451 to be engaged in the second V-shaped groove 4231, thus locking the card 42. At this time, the upper surface of the movable plate 14 is flush with the upper surface of the fixed plate 13.

[0081] When the movable plate 14 needs to be retracted to the tabletop, the user presses down on the edge of the movable plate 14 again, causing the slider 43 to push the card 42 downwards. Under the guidance of the wedge block 426, the end 451 slides out from the second V-groove 4231, and the card 42 is unlocked. At this time, the user removes the external force pressing the movable plate 14. Under the elastic force of the tension spring 44, the card 42 moves upwards, and the end 451 slides along the surface of the guide boss 424 and enters the straight groove 4221. The upward movement of the card 42 pushes the slider 43 to move upwards simultaneously, causing the movable plate 14 to move upwards, so that the upper surface of the movable plate 14 is higher than the upper surface of the fixed plate 13. Then, the movable plate 14 can be retracted through the multi-stage telescopic mechanism 3.

[0082] Reference Figure 15 and Figure 16The guide boss 424 has an inclined surface that contacts the end 451, with its lower side flush with the bottom wall of the straight groove 4221 and its higher side higher than the bottom wall of the straight groove 4221. To prevent the swing arm 45 from bending when the end 451 slides along the surface of the guide boss 424, an adjustment component is provided on the card 42 to keep the relative height between the end 451 and the fixed seat 41 constant when the end 451 slides along the surface of the guide boss 424.

[0083] Specifically, refer to Figure 11 , Figure 12 and Figure 17 The adjustment assembly includes an adjustment rod 425 hinged to both sides of the card 42. A slider 4251 and a protrusion 4252 are fixedly connected to both sides of the free end of the adjustment rod 425. An upper adjustment plate 411 and a lower adjustment plate 412 are fixedly provided on the side of the fixed base 41. A gap is provided between the upper adjustment plate 411 and the fixed base 41 for the slider 4251 to slide.

[0084] Reference Figure 17 The adjusting rod 425 abuts against the lower adjusting plate 412, and the protrusion 4252 abuts against the upper adjusting plate 411. The side of the upper adjusting plate 411 that contacts the protrusion 4252 has a second inclined surface 4111, the side of the adjusting rod 425 that contacts the lower adjusting plate 412 has a third inclined surface 4253, and the side of the lower adjusting plate 412 that contacts the adjusting rod 425 has a fourth inclined surface 4121. The inclination angles of the second inclined surface 4111, the third inclined surface 4253, and the fourth inclined surface 4121 are all consistent with the inclination angle of the guide boss 424 surface.

[0085] When card 42 is unlocked, card 42 slides relative to the fixed base 41, and end 451 slides along the surface of guide boss 424. During this process, the second inclined surface 4111 slides with the protrusion 4252, and the third inclined surface 4253 slides with the fourth inclined surface 4121, so that the relative height change between card 42 and fixed base 41 cancels the inclination of guide boss 424, thereby keeping the relative height between end 451 and fixed base 41 constant. This can reduce the possibility of the swing arm 45 bending due to end 451 sliding along guide boss 424.

[0086] The implementation principle of an expandable experimental workbench according to an embodiment of this application is as follows: When the sink is not in use, multiple rotating plates 21 are driven to rotate synchronously by a first driving mechanism, covering the open end of the sink, thereby increasing the usable area of ​​the desktop; a multi-stage telescopic mechanism 3 drives a movable plate 14 to slide along a fixed plate 13, allowing the movable plate 14 to extend from one side of the desktop, further increasing the usable area of ​​the desktop; after the movable plate 14 is extended, a fixing mechanism 4 fixes the movable plate 14 and makes its upper surface flush with the upper surface of the fixed plate 13, that is, the upper surface of the movable plate 14 is flush with the desktop, facilitating experimental operations on the movable plate 14. This application can realize the expansion of the experimental workbench, providing a flexible working area and helping to improve the space utilization of the laboratory.

[0087] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. An experimental workbench with an expandable surface, characterized in that: include: A table, on which a sink is installed; A cover plate is provided on the water tank. The cover plate has a through hole that communicates with the upper opening of the water tank. A mounting base is fixedly provided at the bottom of the cover plate. Multiple rotating plates are rotatably mounted on the mounting base, and the multiple rotating plates are distributed at equal intervals along the circumference of the mounting base. A first driving mechanism is used to drive the plurality of rotating plates to rotate synchronously, so that the rotating plates cover or open the through hole; A fixing plate is fixedly installed on the upper surface of the table body; A movable plate is slidably disposed on the upper end surface of the fixed plate; A multi-stage telescopic mechanism is used to drive the movable plate to slide along the fixed plate; A fixing mechanism is provided to fix the movable plate and make its upper surface flush with the upper surface of the fixed plate when the movable plate slides to one side of the fixed plate. The fixing mechanism includes a fixing seat fixed to the multi-stage telescopic mechanism, a card slidably disposed on the fixing seat, a sliding piece slidably disposed between the fixing seat and the card, the upper end of the sliding piece being fixed to the lower end face of the moving plate, and a fixing component for fixing the card being disposed on the fixing seat. The slider has a first inclined surface on both sides, and the card has a first V-shaped groove on both sides that fits into the first inclined surface; the card has an adjustment groove on both sides, the adjustment groove including a straight groove extending vertically and a branch groove communicating with one side of the straight groove; the fixing assembly includes a locking block fixedly disposed in the adjustment groove and a swing rod rotatably connected to the fixing base; the free end of the swing rod is fixedly connected to an end head; the locking block has a second V-shaped groove for accommodating the end head; a wedge block is fixedly connected to the inner wall of the adjustment groove, the wedge block being disposed opposite to the second V-shaped groove; a tension spring is connected between the fixing base and the card; The connection between the straight groove and the branch groove is provided with a guide boss, which is used to guide the end from the straight groove into the branch groove; The surface of the guide boss that contacts the end head is inclined. The card is provided with an adjustment component to keep the relative height between the end head and the fixed seat constant when the end head slides along the surface of the guide boss. The adjustment assembly includes adjustment rods hinged to both sides of the card. A slider and a protrusion are fixedly connected to the free ends of the adjustment rods on both sides, respectively. An upper adjustment plate and a lower adjustment plate are fixedly arranged on the side of the fixed base. A gap is provided between the upper adjustment plate and the fixed base for the slider to slide. The adjustment rod abuts against the lower adjustment plate, and the protrusion abuts against the upper adjustment plate. A second inclined surface is provided on the side of the upper adjustment plate that contacts the protrusion, a third inclined surface is provided on the side of the adjustment rod that contacts the lower adjustment plate, and a fourth inclined surface is provided on the side of the lower adjustment plate that contacts the adjustment rod. The inclination angles of the second, third, and fourth inclined surfaces are all consistent with the inclination angle of the guide protrusion surface.

2. The experimental workbench with an expandable tabletop according to claim 1, characterized in that: The first driving mechanism includes an external gear ring rotatably mounted on the mounting base and a plurality of connecting rods hinged to the external gear ring. Each of the plurality of connecting rods corresponds to a plurality of rotating plates, and the end of each connecting rod away from the external gear ring is hinged to the corresponding rotating plate. The mounting base is provided with a first driving member for driving the external gear ring to rotate.

3. The experimental workbench with an expandable tabletop according to claim 1, characterized in that: A fixed frame is fixedly connected to the bottom surface of the fixed plate. The table body is fixedly provided with two symmetrically arranged first guide rails and two symmetrically arranged second guide rails. A first sliding frame is slidably arranged between the two first guide rails, and a second sliding frame is slidably arranged between the two second guide rails. A sliding bar is slidably arranged on the second sliding frame, and the end of the sliding bar is fixedly connected to the bottom of the moving plate. A second driving component for driving the first sliding frame to slide is provided on the fixed frame. The multi-stage telescopic mechanism includes a first driving component for driving the second sliding frame to slide synchronously with the first sliding frame and a second driving component for driving the sliding bar to slide synchronously with the second sliding frame.

4. The experimental workbench with an expandable tabletop according to claim 3, characterized in that: The first drive assembly includes two sets of first synchronous pulleys rotatably mounted on the first sliding frame. Each set of first synchronous pulleys is tensioned and covered with a first synchronous belt. A first fixing block and a second fixing block are respectively fixed to opposite sides of the first synchronous belt. The first fixing block is fixed to the fixing frame, and the second fixing block is fixed to the second sliding frame.

5. The experimental workbench with an expandable tabletop according to claim 4, characterized in that: The second drive assembly includes two sets of second synchronous pulleys rotatably mounted on the second sliding frame. Each set of second synchronous pulleys is tensioned and covered with a second synchronous belt. A third fixing block and a fourth fixing block are respectively fixed to opposite sides of the second synchronous belt. The third fixing block is fixed to the first sliding frame, and the fourth fixing block is fixed to the sliding bar.

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