Fixed dock leveler

Abstract

The utility model provides a fixed dock leveler which comprises a base, a table top and a lip plate, one end of the table top is hinged to the base, the lip plate is hinged to the other end of the table top, a telescopic driving piece is hinged between the base and the table top, a first connecting rod assembly is further arranged between the base and the table top, and a second connecting rod assembly is further arranged between the base and the table top. A first connecting rod assembly is arranged between the lip plate and the table top, a second connecting rod assembly is further arranged between the lip plate and the table top, the first connecting rod assembly is connected with the second connecting rod assembly, and when the telescopic driving piece drives the table top to move, the first connecting rod assembly is driven by the table top to drive the second connecting rod assembly to movably drive the lip plate to be opened. Through cooperation of the first connecting rod assembly and the second connecting rod assembly, linkage of the lip plate and the table top can be achieved, the number of driving pieces needing to independently drive the lip plate and the table top in a traditional dock leveler can be reduced, and the production cost is reduced.

Description

Technical Field

[0001] This utility model relates to the technical field of loading ramp equipment, and in particular to a fixed loading ramp. Background Technology

[0002] Loading ramps are increasingly widely used in cargo loading and unloading. They enable rapid loading and unloading of goods, essentially acting as a bridge between the cargo and the truck. Traditional loading ramps typically use two active telescopic drive components (such as hydraulic cylinders and hydraulic cylinder pumps, or pneumatic cylinders and pneumatic cylinder pumps) to drive the main platform panel and lip plate, as shown in patent document CN215946196U. These drives are independently controlled and require two separate motors, resulting in higher costs. Utility Model Content

[0003] To address the aforementioned problems, the purpose of this utility model is to provide a fixed loading ramp.

[0004] This utility model is implemented using the following method: a fixed loading ramp includes a base, a platform, and a lip plate. One end of the platform is hinged to the base, and the lip plate is hinged to the other end of the platform. A telescopic drive component is hinged between the base and the platform. A first link assembly is also provided between the base and the platform, and a second link assembly is also provided between the lip plate and the platform. The first link assembly and the second link assembly are connected. When the telescopic drive component drives the platform to move, the first link assembly is driven by the platform to move the second link assembly, which in turn drives the lip plate to open.

[0005] Preferably, the first linkage assembly includes a first rod and a second rod, the second rod being movably connected to the lower surface of the platform, one end of the first rod being hinged to the base, and the other end being movably connected to the second rod; the second linkage assembly includes a third rod and a fourth rod, one end of the third rod being movably connected to the second rod, the fourth rod being fixedly connected to the lip plate, and the other end of the third rod being hinged to the fourth rod.

[0006] Preferably, the second rod is hinged to the lower surface of the platform, the end of the first rod away from the hinge point with the base is provided with a pushing part, the second rod is provided with a receiving part, the pushing part can cooperate with the receiving part, and the third rod is movably connected to the second rod.

[0007] Preferably, the second rod further includes two symmetrically arranged side plates, the pushing part is a pushing shaft located in the middle between the two side plates, the lower surface of the platform is provided with a corresponding hinge seat, the hinge seat is provided with a longitudinal clearance groove, the hinge seat is accommodated between the two side plates, the top of the two side plates are respectively hinged to the corresponding side of the hinge seat, the bottom between the two side plates is provided with a hinge shaft, the hinge shaft is hinged to the third rod; the pushing part is an L-shaped block located on the end face of the first rod, the included angle of the L-shaped block is provided with an arc transition surface, the L-shaped block can move in the clearance groove; when the lip plate is unfolded, the arc transition surface contacts the pushing shaft.

[0008] Preferably, a retractable blocking member is installed on the lower surface of the tabletop near the lip plate. When the lip plate is unfolded, the blocking member can be pushed out and simultaneously abut against the lower surface of the tabletop and the lower surface of the lip plate.

[0009] Preferably, the blocking member is a blocking rod, the lower surface of the table is provided with a guide sleeve, the blocking rod is slidably installed in the guide sleeve, and a return spring is also connected between the blocking rod and the guide sleeve. When the blocking rod is pushed out, it abuts against the lower surface of the lip plate to prevent the lip plate from rotating; elastic baffles are respectively provided on both sides of the upper end of the table.

[0010] Preferably, a first guard plate is provided on each of the two sides of the tabletop, and a second guard plate is hinged to each of the first guard plates. The hinged side of the second guard plate near the tabletop and the base is hinged to the first guard plate. A first guide member is provided between the second guard plate and the side of the first guard plate near the lip plate to guide the unfolding of the second guard plate.

[0011] Preferably, the first guide member includes a first arc-shaped groove disposed on the first guard plate and a first guide post disposed on the second guard plate away from its hinge point; or, the first guide member includes a first arc-shaped groove disposed on the second guard plate and a first guide post disposed on the first guard plate away from its hinge point with the second guard plate; the first guide post is located in the first arc-shaped groove.

[0012] Preferably, each of the second guard plates is composed of at least two splicing plates, the two splicing plates are hinged to each other at the hinge joint of the first guard plate, one of the splicing plates is provided with a second arc-shaped groove and the first guide post on the side near the lip plate, and the other splicing plate is provided with a second guide post at the corresponding position, the second guide post passing through the second arc-shaped groove.

[0013] Preferably, the base has a support block located on the platform, and the lower surface of the platform has a movable support column located away from the telescopic drive member, the support column being able to abut against the support block; a damper is also hinged between the lip plate and the lower surface of the platform.

[0014] Preferably, the support column is hinged to the bottom surface of the platform, and a pull rope is connected to the support column at a position away from its hinge point. The pull rope is used to pull the support column to rotate around the hinge point to a support position that abuts against the support block, or to a position that avoids the support block.

[0015] The beneficial effects of this utility model are as follows: This utility model provides a fixed loading ramp, which, compared with the prior art, has at least the following technical effects: 1. The cooperation of the first and second linkage assemblies can realize the linkage between the lip plate and the platform, and also reduce the number of driving components that need to independently drive the lip plate and the platform in traditional loading ramps, thus reducing production costs. 2. Through the connection of the first and second rods, during the descent of the platform, the first rod moves forward relative to the platform, pushing the second rod, which in turn drives the third rod to drive the fourth rod to rotate the lip plate, ensuring the smooth unfolding of the lip plate. 3. Through the cooperation of the pushing part on the first rod and the pushing part on the second rod, during the relative forward movement of the first rod, the second rod is pushed to rotate relative to the hinge point towards the lip plate, thereby pushing the third rod forward. The third rod will then push the lip plate to rotate upward and unfold, realizing the single-drive linkage control of the lip plate and the platform. 4. A clearance groove is provided in the hinge seat, and the second rod is composed of two side plates. Together with the clearance groove of the hinge seat, they form the movable space of the first rod, allowing the pushing part of the first rod to move relative to the hinge seat and the second rod in both forward and backward and up and down, so as to achieve drive only the lip plate to unfold. 5. The design of the blocking component can provide additional support for the unfolded lip plate when maintenance is required, preventing the lip plate from accidentally retracting due to external force, thus improving safety; and in normal use, it can retract to avoid interfering with the movement of the lip plate. This avoids the problem of personnel injury that may occur if the lip plate closes unexpectedly if the power supply device is lost, which is the case in the existing technology where the platform is supported by the maintenance support rod and the lip plate is driven by another telescopic drive component to keep it unfolded, but the power supply device is lost. 6. A guide sleeve and a return spring are provided to facilitate the quick and accurate reset of the blocking rod; the setting of the elastic stop bar can prevent debris from falling into the platform from the gap between the sides of the platform and the base. 7. A first guard plate and a foldable second guard plate are installed on both sides of the platform to block the gap between the platform and the base when the platform is raised, preventing people or goods from falling into the base. 8. The curved groove guides the unfolding or folding of the second guard plate, ensuring smooth and stable unfolding. 9. A support column is also provided on the lower surface of the platform, with a support block on the base. The support block limits the movement of the support column and provides additional support when the platform is flat. The damper allows the first and second linkage assemblies to push the lip plate unfold more easily and provides a buffer when the lip plate retracts. 10. The support column is hinged to the bottom surface of the platform and connected to a pull rope. The pull rope controls the rotation of the support column, allowing it to be pulled to rotate the support column away from the support block when no support is needed. Releasing the pull rope causes the support column to automatically return to a position where it can contact the support block under gravity. Attached Figure Description

[0016] Figure 1 This is a structural diagram of a fixed loading ramp of this utility model in its folded state.

[0017] Figure 2 This is a first-person sectional view of the folded state of a fixed loading ramp according to this utility model.

[0018] Figure 3 This is a cross-sectional schematic diagram of the fixed loading ramp of this utility model in its folded state from a second perspective.

[0019] Figure 4 This is a schematic diagram of the structure of a fixed loading ramp of this utility model, supported to the top.

[0020] Figure 5 This is a cross-sectional view of a fixed loading ramp of this utility model, with the ramp extended to the top.

[0021] Figure 6 This is a cross-sectional view of the lip plate of a fixed loading ramp of this utility model when it is about to be fully unfolded.

[0022] Figure 7 This is a cross-sectional view of the fully unfolded lip plate of a fixed loading ramp according to this utility model.

[0023] Figure 8 This is a cross-sectional view of the lip plate of a fixed loading ramp of this utility model, showing it folding over after being fully extended.

[0024] Figure 9 This is a schematic diagram showing the position of the blocking component and maintenance support rod of a fixed loading ramp of this utility model when it is not under maintenance.

[0025] Figure 10 This is a schematic diagram showing the position of the blocking component and maintenance support rod during the maintenance of a fixed loading ramp according to this utility model.

[0026] Reference numerals: 1. Base; 2. Platform; 21. Hinge seat; 22. Guide sleeve; 3. Lip plate; 4. Telescopic drive component; 5. First linkage assembly; 51. First rod body; 511. Pushing part; 512. Limiting boss; 52. Second rod body; 521. Pushed part; 6. Second linkage assembly; 61. Third rod body; 62. Fourth rod body; 7. Blocking component; 8. Elastic stop bar; 9. First guard plate; 10. Second guard plate; 11. First arc groove; 12. First guide post; 13. Support block; 14. Support post; 15. Pull rope; 16. Damper; 17. Maintenance support rod. Detailed Implementation

[0027] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0028] Please see Figures 1 to 10A fixed loading ramp includes a base 1, a platform 2, and a lip plate 3. One end of the platform 2 is hinged to the base 1, and the lip plate 3 is hinged to the other end of the platform 2. A telescopic drive member 4 is hinged between the base 1 and the platform 2. A first connecting rod assembly 5 is also provided between the base 1 and the platform 2, and a second connecting rod assembly 6 is provided between the lip plate 3 and the platform 2. The first connecting rod assembly 5 and the second connecting rod assembly 6 are connected. When the telescopic drive member 4 drives the platform 2 to move, the first connecting rod assembly 6 is driven by the platform 2, which in turn drives the second connecting rod assembly 5 to move and open the lip plate 3. The cooperation of the first connecting rod assembly 5 and the second connecting rod assembly 6 can realize the linkage between the lip plate 3 and the platform 2, and also reduce the number of drive members that need to independently drive the lip plate 3 and the platform 2 in traditional loading ramps, thus reducing production costs. The first connecting rod assembly 5 and the second connecting rod assembly 6 are arranged to avoid the telescopic drive member 4. Preferably, the telescopic drive component can be a pneumatic cylinder, a hydraulic cylinder, or an electric telescopic cylinder, but is not limited to these.

[0029] Please see Figures 1 to 8 Preferably, the first linkage assembly 5 includes a first rod 51 and a second rod 52. The second rod 52 is movably connected to the lower surface of the platform 2. One end of the first rod 51 is hinged to the base 1, and the other end is movably connected to the second rod 52. The second linkage assembly 6 includes a third rod 61 and a fourth rod 62. One end of the third rod 61 is movably connected to the second rod 52, and the fourth rod 62 is fixedly connected to the lip plate 3. The other end of the third rod 61 is hinged to the fourth rod 62. Through the connection of the first rod 51 and the second rod 52, during the descent of the platform 2, the first rod 51 moves forward relative to the platform 2 to push the second rod 52, thereby driving the third rod 61 to drive the fourth rod 62 to rotate the lip plate 3, ensuring the smooth unfolding of the lip plate 3.

[0030] Please see Figures 1 to 8 Preferably, the second rod 52 is hinged to the lower surface of the platform 2. The first rod 51 has a pushing part 511 at the end opposite to the hinge point with the base 1, and the second rod 52 has a receiving part 521. The pushing part 511 can cooperate with the receiving part 521. The third rod 61 is movably connected to the second rod 52. By cooperating with the pushing part 511 on the first rod 51 and the receiving part 521 on the second rod 52, during the relative forward movement of the first rod 51, the second rod 52 is pushed to rotate relative to the hinge point towards the lip plate 3, thereby pushing the third rod 61 forward. The third rod 61 will then push the lip plate 3 to rotate upward and unfold, realizing the single-drive linkage control of the lip plate 3 and the platform 2.

[0031] Please see Figures 1 to 8Preferably, the second rod 52 further includes two symmetrically arranged side plates. The pushing part 521 is a pushing shaft located in the middle between the two side plates. The lower surface of the platform 2 is provided with a corresponding hinge seat 21. The hinge seat 21 is provided with a longitudinal clearance groove. The hinge seat 21 is accommodated between the two side plates. The tops of the two side plates are respectively hinged to the corresponding sides of the hinge seat 21. The bottom between the two side plates is provided with a hinge shaft, which is hinged to the third rod 61. The pushing part 511 is an L-shaped block located on the end face of the first rod 51. The included angle of the L-shaped block is provided with an arc-shaped transition surface. The L-shaped block can move in the clearance groove. When the lip plate 3 is unfolded, the arc-shaped transition surface contacts the pushing shaft. A clearance groove is provided in the hinge seat 21, and the second rod 52 is composed of two side plates, which together with the clearance groove of the hinge seat 21 form the movable space of the first rod 51, so that the pushing part 511 of the first rod 51 can move relative to the hinge seat 21 and the second rod 52 in the front-back and up-down directions, so as to achieve the drive for only unfolding the lip plate 3. The two sides of the L-shaped block opposite to the first rod 51 are provided with protruding limiting bosses 512. The distance between the end faces of the two limiting bosses 512 is greater than the width of the clearance groove and the distance between the two side plates, to prevent the first rod 51 from separating from the second rod 52. Preferably, the arc transition surface at the included angle of the L-shaped block can be concave, as shown in the figure; of course, the arc transition surface can also be convex, that is, there is an arc bulge at the included angle.

[0032] Please see Figure 3 , Figures 9 to 10 Preferably, a retractable stopper 7 is installed on the lower surface of the platform 2 near the lip plate 3. When the lip plate 3 is unfolded, the stopper 7 can extend and abut against the lower surface of both the platform 2 and the lip plate 3. The design of the stopper 7 provides additional support for the unfolded lip plate 3 when maintenance is required, preventing the lip plate 3 from accidentally retracting due to external forces, thus improving safety; while during normal use, it can retract to avoid interfering with the movement of the lip plate 3.

[0033] Please see Figure 3 , Figures 9 to 10Preferably, the blocking member 7 is a blocking rod, and the lower surface of the tabletop 2 is provided with a guide sleeve 22. The blocking rod is slidably installed in the guide sleeve 22, and a return spring (not shown) is also connected between the blocking rod and the guide sleeve 22. When the blocking rod is pushed out, it abuts against the lower surface of the lip plate 3 to prevent the lip plate 3 from rotating. Elastic baffles 8 are respectively provided on both sides of the upper end of the tabletop 2. The guide sleeve 22 and the return spring facilitate the quick and accurate reset of the blocking rod; the elastic baffles 8 prevent debris from falling into the platform from the gap between the sides of the tabletop 2 and the platform. The elastic baffles 8 can be made of sponge, rubber, silicone, etc., and are not limited to these materials. They are used to fill the gap between the sides of the tabletop 2 and the platform in the initial state, preventing debris from falling into the platform.

[0034] Please see Figure 1 , Figures 3 to 10 Preferably, each side of the platform 2 is provided with a first guard plate 9, and each first guard plate 9 on each side is hinged to a second guard plate 10. The side of the second guard plate 10 closest to the hinge between the platform 2 and the base 1 is hinged to the first guard plate 9. A first guide member is provided between the side of the second guard plate 10 and the side of the first guard plate 9 closest to the lip plate 3 to guide the unfolding of the second guard plate 10. The first guard plate 9 and the foldable second guard plate 10 on both sides of the platform 2 can block the gap between the platform 2 and the platform, preventing people or goods from falling into the platform when the platform 2 is raised.

[0035] Please see Figure 1 , Figures 3 to 10 Preferably, the first guide member includes a first arc-shaped groove 11 disposed on the first guard plate 9, and a first guide post 12 disposed on the second guard plate 10 away from its hinge point; or, the first guide member includes a first arc-shaped groove 11 disposed on the second guard plate 10, and a first guide post 12 disposed on the first guard plate 9 away from its hinge point with the second guard plate 10; the first guide post 12 is located in the first arc-shaped groove 11. The arc-shaped groove guides the unfolding or folding of the second guard plate 10, ensuring smooth and stable unfolding or folding.

[0036] Please see Figure 1 , Figures 3 to 10 Preferably, each of the second protective plates 10 is composed of at least two splicing plates, which are hinged to each other at the hinge joint of the first protective plate 9. One of the splicing plates has a second arc-shaped groove and the first guide post 12 on the side near the lip plate 3, and the other splicing plate has a second guide post at the corresponding position, which passes through the second arc-shaped groove. The second protective plate 10 is composed of at least two splicing plates, and the corresponding second arc-shaped groove and second guide post on the splicing plates have a larger folding splicing range, a larger protective size when unfolded, and a smaller area occupied when folded.

[0037] Please see Figures 3 to 10 Preferably, a support block 13 is provided on the base 1 at the platform 2, and a movable support column 14 is provided on the lower surface of the platform 2 away from the telescopic drive member 4. The support column 14 can abut against the support block 13. A damper 16 is also hinged between the lip plate 3 and the lower surface of the platform 2. The lower surface of the platform 2 is also provided with a support column 14, and the base 1 is provided with a support block 13. The support block 13 limits the support column 14 and provides additional support when the platform 2 is flat. The damper 16 makes it easier for the first linkage assembly 5 and the second linkage assembly 6 to push the lip plate 3 to unfold, and provides a buffering effect when the lip plate 3 retracts. The damper provides damping when the lip plate descends and folds, and provides assistance when the lip plate rises. The damper can be a spring damper or a hydraulic damper.

[0038] Please see Figures 3 to 10 Preferably, the support column 14 is hinged to the bottom surface of the platform 2. A pull rope 15 is connected to the support column 14 away from its hinge point. The pull rope 15 is used to pull the support column 14 to rotate around the hinge point to a support position that abuts against the support block 13, or to a position that avoids the support block 13. The support column 14 is hinged to the bottom surface of the platform 2 and connected to the pull rope 15. The pull rope 15 can control the rotation of the support column 14, so that when the support column 14 is not needed, pulling the pull rope 15 can rotate the support column 14 away from the support block 13, causing the support column 14 to no longer provide support. Releasing the pull rope 15 causes the support column 14 to automatically return to a position where it can contact the support block 13 under gravity. The pull rope 15 can be a chain. The support block 13 can be M-shaped, V-shaped, or N-shaped, with M-shaped being preferred. The support column 14 can be positioned in the groove on the upper side of the M-shape. After being dislodged from the groove, the side of the rear of the M-shape is inclined, which can guide the support column 14 to rotate.

[0039] Please see Figures 9 to 10 Preferably, a maintenance support rod 17 is hinged to the base 1, and a support position is provided at the corresponding position on the bottom surface of the corresponding platform 2.

[0040] The working principle of this utility model is as follows:

[0041] In use, the telescopic drive component 4 (hydraulic cylinder) drives the platform 2 to rotate upward around the hinge point. The corresponding first link assembly 5's first rod 51, limited by the second rod 52 and hinge seat 21, also rotates accordingly and moves away from the lip plate 3 relative to the second rod 52 and hinge seat 21. The second sliding plate rotates downward around the hinge point to block the gap between the platform 2 and the platform caused by the rising. When the platform 2 rotates and rises to its highest point, the limiting protrusion 512 on the L-shaped block of the corresponding first rod 51 abuts against the end face of the hinge seat 21 facing the lip plate 3 (e.g., ...). Figure 5 As shown), under the influence of gravity, the first lifting rod will spontaneously rotate downwards around its hinge point, causing the end face of the L-shaped block on the included angle side to contact the push shaft. Afterwards, the telescopic drive 4 loses power, the platform 2 rotates downwards under its own gravity, and the first rod 51 also rotates downwards under gravity. Due to the different radii of rotation, the hinge point of the first rod 51 is closer to the lip plate 3. Therefore, during the descent stroke, the first rod 51 will move forward relative to the hinge seat 21. As the platform 2 gradually descends, the first rod 51 gradually moves forward until the included angle of the L-shaped block abuts against the push shaft (as shown). Figure 6 As shown), the platform 2 continues to descend, and the L-shaped block of the first rod 51 pushes the push shaft forward, thereby causing the second rod 52 to rotate around the hinge seat 21 towards the lip plate 3, which in turn pushes the third rod 61 to move towards the lip plate 3, and then transmits the force to the fourth rod 62 to rotate forward. Since the fourth rod 62 is fixed to the lip plate 3 (the fourth lip plate 3 and the lip plate 3 are fixedly connected to the hinge shaft of the platform 2), the fourth rod 62 will push the lip plate 3 to rotate around its hinge shaft with the platform 2, lifting it upward and unfolding (as shown). Figure 6 As shown); after unfolding to the maximum angle (parallel to tabletop 2, as shown). Figure 7 As shown), as the platform 2 continues to be pushed downwards, the axis will rotate relative to the L-shaped block, causing the L-shaped block to move out and slide out at the angle of the surface (such as...). Figure 8 (As shown), even if the platform 2 continues to rotate downwards, the first rod 51 can no longer push the pushed shaft. At this time, if the carriage blocks the lip plate 3, it cannot be retracted. If there is no carriage blocking it, the lip plate 3 will rotate downwards and retract under its own gravity (at the same time, it pushes the fourth rod 62 to push the third rod 61 to move backwards, and the third rod 61 pushes the second rod 52 to rotate downwards and reset to the initial position). Due to the resistance provided by the damper 16, the lip plate 3 slowly rotates downwards (which provides assistance when unfolding, making it easier for the linkage assembly to drive the lip plate 3 to unfold). It can also pull the support column 14 backwards through the pull rope 15, causing the trajectory of the lower end of the support column 14 to deviate from the contact position with the support block 13 (such as...). Figure 8 As shown), it can fit better with the carriage. When boarding is not required, the pull rope 15 is not pulled, and the support column 14 returns to its original position under its own weight, so that its lower end can contact the support block 13 (as shown). Figure 3 As shown, this process requires the platform 2 to be raised and then lowered to support the initial position of the platform 2, distribute the force evenly, and prevent the platform 2 from deforming.

[0042] During maintenance, such as Figure 10 As shown, the telescopic drive 4 drives the platform 2 to rise to the top, pulling up the maintenance support rod 17 so that it abuts against the support position. Then, manually rotate the lip plate 3 to its maximum opening, and use the other hand to pull out the blocking piece 7, so that it abuts against both the platform 2 and the lip plate 3 simultaneously, thus preventing the lip plate 3 from rotating and facilitating maintenance. When not in use, as... Figure 9As shown, lower the maintenance support rod 17 and push the blocking part 7 back.

[0043] Several points should be noted: First, in the description of this application, it should be noted that, unless otherwise specified and limited, the terms "installation", "connection" and "linkage" should be interpreted broadly, and can be mechanical or electrical connection, or internal connection between two components, or direct connection. "Up", "down", "left", "right", etc. are only used to indicate relative positional relationship. When the absolute position of the described object changes, the relative positional relationship may change.

[0044] Secondly: The accompanying drawings of the embodiments disclosed in this utility model only involve the structures involved in the embodiments disclosed in this utility model. Other structures can refer to the general design. In the absence of conflict, the same embodiment and different embodiments of this utility model can be combined with each other.

[0045] Finally, the above description is only a preferred embodiment of the present utility model. The protection scope of the present utility model is not limited to the above embodiments. All technical solutions that fall within the scope of the present utility model are protected by the present utility model.

[0046] It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principles of this utility model should also be considered within the scope of protection of this utility model.

Claims

1. A fixed loading ramp, comprising a base, a platform, and a lip plate, wherein one end of the platform is hinged to the base, the lip plate is hinged to the other end of the platform, and a telescopic drive member is hinged between the base and the platform, characterized in that: A first linkage assembly is provided between the base and the platform, and a second linkage assembly is provided between the lip plate and the platform. The first linkage assembly and the second linkage assembly are connected. When the telescopic drive member drives the platform to move, the first linkage assembly is driven by the platform to drive the second linkage assembly to move and drive the lip plate to open.

2. A fixed loading ramp according to claim 1, characterized in that: The first linkage assembly includes a first rod and a second rod, the second rod being movably connected to the lower surface of the platform, one end of the first rod being hinged to the base, and the other end being movably connected to the second rod; the second linkage assembly includes a third rod and a fourth rod, one end of the third rod being movably connected to the second rod, the fourth rod being fixedly connected to the lip plate, and the other end of the third rod being hinged to the fourth rod.

3. A fixed loading ramp according to claim 2, characterized in that: The second rod is hinged to the lower surface of the platform. The end of the first rod away from the hinge point with the base is provided with a pushing part. The second rod is provided with a receiving part. The pushing part can cooperate with the receiving part. The third rod is movably connected to the second rod.

4. A fixed loading ramp according to claim 3, characterized in that: The second rod also includes two symmetrically arranged side plates. The pushing part is a pushing shaft located in the middle between the two side plates. The lower surface of the platform is provided with a corresponding hinge seat. The hinge seat has a longitudinal clearance groove. The hinge seat is accommodated between the two side plates. The tops of the two side plates are respectively hinged to the corresponding sides of the hinge seat. The bottom between the two side plates is provided with a hinge shaft, which is hinged to the third rod. The pushing part is an L-shaped block located on the end face of the first rod. The included angle of the L-shaped block is provided with an arc-shaped transition surface. The L-shaped block can move in the clearance groove. When the lip plate is unfolded, the arc-shaped transition surface contacts the pushing shaft.

5. A fixed loading ramp according to claim 1, characterized in that: A retractable blocking member is installed on the lower surface of the tabletop near the lip plate. When the lip plate is unfolded, the blocking member can be pushed out and simultaneously abut against the lower surface of both the tabletop and the lip plate.

6. A fixed loading ramp according to claim 5, characterized in that: The blocking component is a blocking rod. A guide sleeve is provided on the lower surface of the platform. The blocking rod is slidably installed in the guide sleeve. A return spring is also connected between the blocking rod and the guide sleeve. When the blocking rod is pushed out, it abuts against the lower surface of the lip plate to prevent the lip plate from rotating. Elastic stop strips are provided on both sides of the upper end of the platform.

7. A fixed loading ramp according to claim 1, characterized in that: The tabletop has a first guard plate on each side, and a second guard plate is hinged to each of the first guard plates. The hinged side of the second guard plate near the tabletop and the base is hinged to the first guard plate. A first guide is provided between the second guard plate and the side of the first guard plate near the lip plate to guide the unfolding of the second guard plate.

8. A fixed loading ramp according to claim 7, characterized in that: The first guide member includes a first arc-shaped groove on the first guard plate and a first guide post on the second guard plate away from its hinge point; or, the first guide member includes a first arc-shaped groove on the second guard plate and a first guide post on the first guard plate away from its hinge point with the second guard plate; the first guide post is located in the first arc-shaped groove; each second guard plate is composed of at least two splicing plates, the two splicing plates are hinged to each other at the hinge point of the first guard plate, one of the splicing plates is provided with a second arc-shaped groove and the first guide post on the side near the lip plate, and the other splicing plate is provided with a second guide post at the corresponding position, the second guide post passing through the second arc-shaped groove.

9. A fixed loading ramp according to claim 1, characterized in that: The base has a support block on the platform, and the lower surface of the platform has a movable support column that avoids the telescopic drive member. The support column can abut against the support block. A damper is also hinged between the lip plate and the lower surface of the platform.

10. A fixed loading ramp according to claim 9, characterized in that: The support column is hinged to the bottom surface of the platform. A pull rope is connected to the support column away from its hinge point. The pull rope is used to pull the support column to rotate around the hinge point to a support position that abuts against the support block, or to a position that avoids the support block.

Images