Hydraulic lifting platform with self-locking structure

Abstract

The hydraulic lifting platform with the self-locking structure is characterized in that a lifting platform body is installed at the top end of a shear type lifting frame, limiting sliding grooves are symmetrically formed in the left end and the right end of the lifting platform body, limiting pieces are slidably installed in the limiting sliding grooves, and stand columns are symmetrically fixed to the left side face and the right side face of a base; a door plate is installed between the two stand columns on the front side, the left end of the door plate is rotationally connected with the stand column on the left front side through a pin shaft, a locking mechanism is installed in the stand column on the right front side, the locking mechanism is arranged in the stand columns, a locking piece in the locking mechanism can lock the door plate, and a fixing piece can lock a limiting piece. When the door plate is in an open state, the fixing piece locks the limiting piece so that the lifting table can not ascend and descend, and when the lifting table is not located at the highest position, the locking piece can automatically lock the door plate so that the door plate can not be opened.

Description

Technical Field

[0001] The present invention relates to the technical field of hydraulic lifts, and in particular to a hydraulic lift platform with a self-locking structure. Background Art

[0002] Some factories have two or more floors, so conventional staircases or elevators are not suitable for transporting heavy goods. Hydraulic lifts are often used for this purpose. These platforms are typically surrounded by multiple columns to guide their movement. A protective net is placed between each pair of columns to prevent goods or personnel from falling. A door panel is also installed between the columns for entry and exit.

[0003] The door panel and the hydraulic lift are designed independently. An opening is left on the second floor slab above the hydraulic lift for the lift to ascend and descend. When the hydraulic lift ascends into the opening and is loading and unloading cargo, it maintains a stable state due to the oil pressure maintained by the hydraulic lift. However, after prolonged use, it may slide down for some reason. This could lead to workers accidentally stepping on air and falling if the hydraulic lift malfunctions and suddenly drops during loading and unloading.

[0004] Similarly, if the door panel of a hydraulic lift is left open or is opened due to misoperation, the opening for the lift to be raised or lowered will be exposed, and people may fall into the opening if they accidentally fall. To address this, we have designed a hydraulic lift with a self-locking mechanism. Summary of the Invention

[0005] The present invention provides a hydraulic lifting platform with a self-locking structure, which solves the above problems.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions: A hydraulic lifting platform with a self-locking structure comprises a base, two groups of scissor-type lifting frames are symmetrically arranged at the left and right ends above the base, a rear fixing rod is fixed to the rear side of the base, a front fixing rod is fixed to the front side between the two groups of scissor-type lifting frames, a hydraulic cylinder is rotatably mounted on the rear fixing rod, the front end of the push rod of the hydraulic cylinder is rotatably connected to the front fixing rod, a lifting platform is mounted on the top of the scissor-type lifting frame, a limiting slide is symmetrically opened at the left and right ends of the lifting platform, and a limiting member is slidably mounted in the limiting slide; A column is symmetrically fixed on the left and right sides of the base, and each of the columns is penetrated on the left and right to form a limiting opening. The limiting member is slidably placed in the limiting opening. A door panel is installed between the two front columns. The left end of the door panel is rotatably connected to the column on the left front side through a pin shaft. The column on the right front side and the right rear side of the door panel are embedded with magnets, and the door panel is magnetically connected to the column. A locking mechanism is installed inside the right front column, and the locking mechanism includes a locking member for fixing the limiting member and a fixing member for limiting the door panel.

[0007] Preferably, a guide frame 1 is fixed to the left and right ends of the upper front side of the base, and a guide frame 2 is fixed to the left and right ends of the lower front side of the lifting platform, and the front ends of the two scissor-type lifting frames are rotatably mounted with support wheels through axle pins, and the support wheels are in rolling contact with the corresponding guide frame 1 and guide frame 2; The upper and lower sides of the rear end of the scissor-type lifting frame are rotatably connected to the base and the lower surface of the lifting platform through shaft pins respectively.

[0008] Preferably, the limit member includes a limit rod slidably inserted in the limit slot, the limit rod is integrally formed with a limit head at one end close to the column, the upper end surface of the limit head is cut away to form an unlocking inclined surface, the cross-section of the limit head is a right-angled triangle structure, a fixing plate is welded to the outward side surface of the limit head, a limiting notch is provided on the fixing plate, and an abutment wheel is rotatably mounted on the inward side surface of the limit head through a shaft pin; A limit spring is inserted into the limit slide, and the two ends of the limit spring abut against the side of the limit rod away from the column and the inner wall of the limit slide respectively. The limit spring makes the limit rod always have a tendency to move outward, thereby making the abutment wheel always in rolling contact with the surface of the column. When the lifting platform is in the desired position, the limit member can automatically lock and support the lifting platform; When the lifting platform is rising or falling, the limit head and the fixed plate are completely retracted into the limit slide groove and do not contact the side of the column, while the outer ring surface of the abutment wheel will roll in contact with the side of the column, which can reduce the wear of the limit parts and the column.

[0009] Preferably, four connecting slides are opened on the side of the lifting platform, and the four connecting slides are respectively connected to the four limiting slides, and a pulling rod is respectively slidably arranged between two relative connecting slides, and the pulling rod is fixed to its corresponding limiting rod, and two sleeve rings are fixed on the pulling rod, and a double-headed cylinder is installed under the lifting platform, and the two push rods of the double-headed cylinder are respectively slidably inserted in the two sleeve rings, and a contact ring is fixed on the push rod of the double-headed cylinder, and the sleeve ring and the push rod of the double-headed cylinder are slidably connected; When the lifting platform is at the top and needs to move downward, the push rod of the double-headed cylinder contracts. During the contraction process, the push rod will make the contact ring contact with the sleeve ring, so that the pull rod will move inward along with the push rod of the double-headed cylinder. At this time, the limit piece will also move inward and disengage from the limit port, and then the lifting platform can be moved downward by the hydraulic cylinder.

[0010] Preferably, a lifting groove is provided on the right side surface of the right front column, and an insertion interface is provided on the front side of the column, the insertion interface is connected to the lifting groove, and a limiting hole and a locking hole are respectively provided at the bottom of the insertion interface and the lifting groove, and the limiting hole and the locking hole are both connected to the limiting port; The locking member includes a locking rod that is slidably arranged in the lifting groove, the lower end of the locking rod passes through the locking hole and extends into the limit mouth, the bottom end of the locking rod is hemispherical, and the bottom end of the locking rod is in sliding contact with the unlocking inclined surface, a lower pressure plate is sleeved and fixed on the locking rod, the lower pressure plate is connected to a lower pressure spring, the upper end of the lower pressure spring is fixed to the top of the inner wall of the lifting groove, when the unlocking inclined surface is away from the bottom of the locking rod, the lower pressure spring will cause the locking rod to move downward, and when the limit head and the unlocking inclined surface move from left to right, the unlocking inclined surface will push the locking rod to move upward; The locking rod is provided with locking sliding holes running through the front and back sides, and a locking block is fixed on the top end of the locking sliding hole.

[0011] Preferably, the fixing member includes a lifting block that is slidably placed in the plug-in interface up and down, the top of the lifting block is connected to a compression spring, the upper end of the compression spring is fixed to the top of the inner wall of the plug-in interface, and the lower end of the lifting block is integrally formed with a fixing head, the lower end of the fixing head is slidably inserted into the limiting hole up and down, and the limiting hole and the fixing head are located directly above the limiting notch, and the compression spring makes the fixing head and the lifting block always have a tendency to move downward, and when the lifting block is not subjected to external force other than the compression spring, the fixing head can be inserted into the limiting notch, thereby limiting the movement of the limiting member; The lifting block is penetrated by a through-interface at the front and back, and an extrusion block is fixed on the front top of the through-interface. The lower outward inclined surface of the extrusion block is designed to form an extrusion inclined surface. The cross-section of the extrusion block is a right-angled triangle structure. The width of the lifting block is the same as the width of the plug-in interface. The two side walls of the lifting block are in sliding contact with the two side walls of the plug-in interface up and down, and there is a certain distance between the top of the lifting block and the top of the plug-in interface, which facilitates the up and down movement of the lifting block and the fixed head. When the fixed head moves to the maximum extent, that is, the fixed head disengages from the limiting notch, the fixed head is still placed in the limiting hole to prevent it from falling off.

[0012] Preferably, a clamping piece is welded to the right end of the rear side of the door panel, and a lifting portion is welded to the front side of the upper end of the clamping piece. A lifting slope is formed by cutting off the part on the lifting portion. The cross-section of the lifting portion is a right-angled triangle structure. The height of the through-interface is greater than the height of the clamping piece. When the clamping piece enters the plug-in interface and the through-interface, the lifting slope will contact the extrusion slope, and as the clamping piece gradually penetrates deeper, the lifting slope will gradually push the extrusion slope to make the lifting block move upward. When the clamping piece completely enters the plug-in interface, the fixed head below the lifting block is disengaged from the limiting notch.

[0013] Preferably, the clamping piece is provided with a locking opening extending upward and downward at one end away from the lifting portion. When the clamping piece is fully inserted into the insertion interface, the locking opening is located above and below the locking block, and the shape and size of the locking block are the same as those of the locking opening. When the limit head and the unlocking inclined surface move from left to right, that is, the limit piece is inserted into the limit opening, the unlocking inclined surface will push the locking rod to move upward, and the locking block will disengage from the locking opening. When the limit piece disengages from the limit opening, the locking rod will move downward under the action of the lower compression spring, and the locking block located in the locking rod will also move downward accordingly, and the locking block will be clamped into the locking opening, thereby limiting the forward and backward movement of the clamping piece, and can lock and limit the door panel, making it impossible to open.

[0014] Preferably, the clip, through-interface and locking slide hole are all designed with an arc-shaped structure, and the arc centers of the clip, through-interface and locking slide hole are colinear with the axis of the pin shaft of the door panel. When the door panel rotates, the clip can be inserted into the through-interface and locking slide hole without interference.

[0015] Beneficial effects of the present invention: 1. By setting four sets of limit pieces on the inner wall of the lifting platform for sliding left and right, and openings for inserting the limit pieces on the columns, when the lifting platform rises to the required position, the limit pieces can be automatically inserted into the openings, thereby self-locking and limiting the lifting platform, which can partially support the lifting platform, avoid distributing the entire weight load of the lifting platform on the push rod of the hydraulic cylinder, reduce the weight of the hydraulic cylinder push rod, avoid long-term excessive load causing wear of the sealing ring or unstable pressure of the hydraulic system, improve the stability of the hydraulic cylinder, and prevent the lifting platform from sliding down due to hydraulic cylinder failure; 2. By setting a locking mechanism inside the column, the locking part in the locking mechanism can lock the door panel, and the fixing part can lock the limit part. When the door panel is in the open state, the fixing part will lock the limit part, so that the lifting platform cannot be raised or lowered. When the lifting platform is not at the highest point, the locking part will automatically lock the door panel, so that the door panel cannot be opened, avoiding the opening of the floor when the lifting platform is not at the highest point, which may cause people to fall, thereby improving safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic cross-sectional view of a hydraulic lifting platform with a self-locking structure proposed by the present invention; Figure 2 This is a schematic diagram of the installation position of a self-locking structure proposed by the present invention; Figure 3 For the present invention Figure 1 Schematic diagram of the structure of the medium scissor lift; Figure 4 for Figure 1 Structural explosion diagram of the middle lifting platform and the limiter; Figure 5 It is a partial cross-sectional diagram of the column, the limiter and the locking mechanism; Figure 6 It is a structural diagram of the limiter and locking mechanism; Figure 7 for Figure 5 Schematic diagram of the structure of the center column; Figure 8 for Figure 6 Schematic diagram of the structure of the fixing parts; Figure 9 This is a simplified structural diagram of the door panel's pivot pin, connecting piece, and locking slide hole.

[0017] Reference numerals in the figure: 1, base; 11, guide frame 1; 2, scissor lift frame; 21, support wheel; 3, hydraulic cylinder; 31, rear fixing rod; 32, front fixing rod; 4, lifting platform; 401, limiting slide; 402, connecting slide; 41, guide frame 2; 42, limiting member; 421, limiting rod; 422, limiting head; 423, unlocking inclined plane; 424, abutting wheel; 425, limiting notch; 43, limiting spring; 44, pulling rod; 441, sleeve ring; 45, double-headed cylinder; 451, contact ring; 5, column; 51. Limiting opening; 52. Lifting slot; 53. Insertion port; 54. Locking hole; 55. Limiting hole; 6. Door panel; 61. Pin; 7. Locking mechanism; 71. Locking member; 711. Locking rod; 712. Locking slide hole; 713. Lower pressure spring; 714. Lower pressure plate; 715. Locking block; 72. Fixing member; 721. Lifting block; 722. Compression spring; 723. Fixing head; 724. Insertion port; 725. Extrusion block; 73. Snap-fit ​​member; 731. Locking opening; 732. Lifting portion; 733. Lifting slope. DETAILED DESCRIPTION

[0018] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0019] Reference Figures 1-9A hydraulic lifting platform with a self-locking structure includes a base 1, two groups of scissor-type lifting frames 2 are symmetrically arranged on the left and right ends above the base 1, a rear fixed rod 31 is fixed on the rear side of the base 1, and a front fixed rod 32 is fixed on the front side between the two groups of scissor-type lifting frames 2. A hydraulic cylinder 3 is rotatably installed on the rear fixed rod 31, and the front end of the push rod of the hydraulic cylinder 3 is rotatably connected to the front fixed rod 32. A lifting platform 4 is installed on the top of the scissor-type lifting frame 2, and a limiting slide 401 is symmetrically opened on the left and right ends of the lifting platform 4, and a limiting member 42 is slidably installed in the limiting slide 401; A column 5 is symmetrically fixed on the left and right sides of the base 1. A protective net is laid between two adjacent columns 5 as needed to prevent objects or people on the lifting platform 4 from falling. Each column 5 is penetrated on the left and right to form a limiting opening 51, and the limiting member 42 is slidably placed in the limiting opening 51. A door panel 6 is installed between the two front columns 5. The left end of the door panel 6 is rotatably connected to the left front column 5 through a pin shaft 61. Magnets are embedded in the right front column 5 and the right rear side of the door panel 6. The door panel 6 is magnetically connected to the column 5. A locking mechanism 7 is installed inside the right front column 5. The locking mechanism 7 includes a locking member 71 for fixing the limiting member 42, and a fixing member 72 for limiting the door panel 6.

[0020] A guide frame 11 is fixed to the left and right ends of the upper front side of the base 1, and a guide frame 2 41 is fixed to the left and right ends of the lower front side of the lifting platform 4. The front ends of the two scissor-type lifting frames 2 are rotatably mounted with support wheels 21 through axle pins. The support wheels 21 are in rolling contact with the corresponding guide frames 11 and 41. The upper and lower sides of the rear end of the scissor lift frame 2 are rotatably connected to the base 1 and the lower surface of the lifting platform 4 through axle pins respectively.

[0021] Reference Figure 4-Figure 6 The limiting member 42 includes a limiting rod 421 slidably inserted in the limiting slot 401, and an end of the limiting rod 421 close to the column 5 is integrally formed with a limiting head 422. The upper end surface of the limiting head 422 is cut away to form an unlocking inclined surface 423. The cross-section of the limiting head 422 is a right-angled triangle structure. A fixing plate is welded to the outward surface of the limiting head 422, and a limiting notch 425 is provided on the fixing plate. An abutting wheel 424 is rotatably mounted on the inward surface of the limiting head 422 through an axle pin. A limit spring 43 is inserted into the limit slot 401. The two ends of the limit spring 43 abut against the side of the limit rod 421 away from the column 5 and the inner wall of the limit slot 401 respectively. The limit spring 43 makes the limit rod 421 always have a tendency to move outward, thereby making the abutting wheel 424 always in rolling contact with the surface of the column 5. When the lifting platform 4 is in the desired position, the limit member 42 can automatically lock and support the lifting platform 4. The abutting wheel 424, the limiting head 422 and the fixing plate can all be slidably inserted into the limiting slide groove 401 and the limiting opening 51. When the lifting platform 4 is at the uppermost position, the limiting head 422, the abutting wheel 424 and the fixing plate are clamped into the limiting opening 51. The limiting member 42 can be used to partially support the lifting platform 4, so as to avoid the entire weight load of the lifting platform 4 being distributed on the push rod of the hydraulic cylinder 3, thereby reducing the weight of the push rod of the hydraulic cylinder 3, preventing the push rod from carrying excessive weight for a long time, causing wear of the sealing ring or unstable pressure in the hydraulic system, and improving the stability of the hydraulic cylinder 3. When the lifting platform 4 is in the process of rising or falling, the limit head 422 and the fixed plate are completely retracted into the limit slide groove 401 and do not contact the side of the column 5, while the outer ring surface of the abutment wheel 424 will roll in contact with the side of the column 5, which can reduce the wear of the limit member 42 and the column 5.

[0022] Four connecting slides 402 are provided on the side of the lifting platform 4, and the four connecting slides 402 are respectively connected to the four limiting slides 401. A pulling rod 44 is slidably provided between two relatively symmetrical connecting slides 402. The pulling rod 44 is fixed to its corresponding limiting rod 421. Two sleeve rings 441 are fixed on the pulling rod 44. A double-headed cylinder 45 is installed under the lifting platform 4. The two push rods of the double-headed cylinder 45 are respectively slidably inserted into the two sleeve rings 441, and a contact ring 451 is fixed on the push rod of the double-headed cylinder 45. The sleeve ring 441 and the push rod of the double-headed cylinder 45 are slidably connected. When the lifting platform 4 is at the top and needs to move downward, the push rod of the double-headed cylinder 45 contracts. During the contraction process, the push rod will make the contact ring 451 contact with the sleeve ring 441, so that the pulling rod 44 moves inward along with the push rod of the double-headed cylinder 45. At this time, the limit member 42 will also move inward and disengage from the limit opening 51. After that, the lifting platform 4 can be moved downward by the hydraulic cylinder 3. In the process of the lifting platform 4 moving downward, the push rod of the double-headed cylinder 45 will extend again. Under the action of the limit spring 43, the limit member 42 will abut against the column 5 and has a tendency to move outward, so as to facilitate the next rapid limit fixation of the lifting platform 4.

[0023] Reference Figure 5-Figure 9 A lifting groove 52 is provided on the right side surface of the right front column 5, and an insertion port 53 is provided on the front side of the column 5. The insertion port 53 is connected to the lifting groove 52. A limiting hole 55 and a locking hole 54 are respectively provided at the bottom ends of the insertion port 53 and the lifting groove 52. The limiting hole 55 and the locking hole 54 are both connected to the limiting opening 51. The locking member 71 includes a locking rod 711 that slides up and down in the lifting groove 52. The lower end of the locking rod 711 passes through the locking hole 54 and extends into the limit opening 51. The bottom end of the locking rod 711 is a hemispherical structure, and the bottom end of the locking rod 711 slides in contact with the unlocking inclined surface 423. A lower pressure plate 714 is sleeved and fixed on the locking rod 711. The lower pressure plate 714 is connected to a lower pressure spring 713. The upper end of the lower pressure spring 713 is fixed to the top of the inner wall of the lifting groove 52. The side surface of the lower pressure plate 714 is in sliding contact with the inner wall of the lifting slot 52. The lower pressure spring 713 makes the locking rod 711 always tend to move downward. When the unlocking slope 423 moves away from the bottom of the locking rod 711, the lower pressure spring 713 will cause the locking rod 711 to move downward. When the limit head 422 and the unlocking slope 423 move from left to right, the unlocking slope 423 will push the locking rod 711 to move upward. A locking slide hole 712 is provided through the locking rod 711 from front to back, and a locking block 715 is fixed to the top end of the locking slide hole 712 .

[0024] When the locking cam 721 is unlocked, the locking cam 722 is unlocked and the winch 70 is unlocked, so that the winch 70 is unlocked. The lifting block 721 is formed with a through-hole 724 through the front and back, and an extrusion block 725 is fixed to the front side of the top end of the through-hole 724. The lower outward inclined surface of the extrusion block 725 is designed to form an extrusion inclined surface. The cross-section of the extrusion block 725 is a right-angled triangle structure. The width of the lifting block 721 is the same as the width of the plug-in interface 53. The two side walls of the lifting block 721 slide in contact with the two side walls of the plug-in interface 53 up and down, and there is a certain distance between the top of the lifting block 721 and the top of the plug-in interface 53, which facilitates the up and down movement of the lifting block 721 and the fixed head 723. When the fixed head 723 moves to the maximum extent, that is, the fixed head 723 disengages from the limiting notch 425, the fixed head 723 is still placed in the limiting hole 55 to prevent it from falling off.

[0025] A clamping piece 73 is welded to the right end of the rear side of the door panel 6, and a lifting portion 732 is welded to the front side of the upper end of the clamping piece 73. A lifting slope 733 is formed by cutting away a portion of the lifting portion 732. The cross section of the lifting portion 732 is a right triangle structure. The height of the through-hole 724 is greater than the height of the clamping member 73. When the clamping member 73 enters the plug-in interface 53 and the through-hole 724, the lifting inclined surface 733 will contact the extrusion inclined surface, and as the clamping member 73 gradually goes deeper, the lifting inclined surface 733 will gradually push the extrusion inclined surface to make the lifting block 721 move upward. When the clamping member 73 completely enters the plug-in interface 53, the fixed head 723 below the lifting block 721 will disengage from the limiting notch 425.

[0026] A locking opening 731 is provided at one end of the clamping member 73 away from the lifting portion 732. When the clamping member 73 is fully inserted into the insertion port 53, the locking opening 731 is located above and below the locking block 715. The shape and size of the locking block 715 are the same as those of the locking opening 731. When the limit head 422 and the unlocking slope 423 move from left to right, that is, the limit member 42 is inserted into the limit opening 51, the unlocking slope 423 will push the locking rod 711 to move upward, and the locking block 715 will disengage from the locking opening 731. When the limit member 42 disengages from the limit opening 51, the locking rod 711 will move downward under the action of the downward pressure spring 713, and the locking block 715 located in the locking rod 711 will also move downward accordingly. The locking block 715 will be clamped into the locking opening 731, thereby limiting the forward and backward movement of the clamping member 73, and can lock and limit the door panel 6, making it impossible to open.

[0027] The clamping member 73, the through-hole 724 and the locking slide hole 712 are all designed in an arc shape. The arc centers of the clamping member 73, the through-hole 724 and the locking slide hole 712 are collinear with the axis of the pin 61 of the door panel 6 (as shown in FIG. Figure 9 As shown), when the door panel 6 rotates, the clamping member 73 can be inserted into the through-port 724 and the locking slide hole 712 without interference.

[0028] Working principle: When installing the device, Figure 2 The installation is performed as shown. After the installation is completed, a layer of protective net is laid between every two adjacent columns 5, and openings are reserved below and above the two front columns 5. The upper opening is used to install the door panel 6.

[0029] When the lifting platform 4 is at the bottom and moves upward, the lifting platform 4 is not at the highest point, and the door panel 6 is in the closed state. When the door panel 6 is in the closed state, the locking rod 711 is at the bottom end under the action of the downward compression spring 713, and the locking block 715 located in the locking rod 711 is also at the bottom end. The locking block 715 is engaged with the locking opening 731, thereby limiting the forward and backward movement of the clamping member 73, and can lock the door panel 6 to a limit position, so that it cannot be opened; At this time, the push rod of the double-headed cylinder 45 is in an extended state, and the limit spring 43 makes the limit rod 421 always have a tendency to move outward, so that the abutment wheel 424 can always roll in contact with the surface of the column 5. When the lifting platform 4 is at the top, under the action of the limit spring 43, the limit head 422, the abutment wheel 424 and the fixing plate will move outward and be inserted into the limit opening 51. At the same time, the unlocking inclined surface 423 of the right front limit head 422 will move from left to right, and the unlocking inclined surface 423 will push the locking rod 711 to move upward, and the locking block 715 will disengage from the locking opening 731. At this time, the door panel 6 can be opened normally, and objects can be loaded and unloaded normally to the top of the lifting platform 4.

[0030] When the door panel 6 is opened, the clamping piece 73 on the door panel 6 will also disengage from the through-hole 724, the locking slide hole 712 and the insertion hole 53. At this time, the lifting portion 732 and the lifting inclined surface 733 are away from the extrusion block 725. Due to the compression spring 722, the fixing head 723 and the lifting block 721 always have a tendency to move downward. The lifting block 721 and the fixing head 723 will move downward under the action of the compression spring 722. The fixing head 723 will be inserted into the limit notch 425, thereby limiting the movement of the limit member 42. At this time, the limit member 42 is inserted into the limit opening 51, and the limit member 42 cannot be disengaged, thereby preventing the lifting platform 4 from moving downward. The lifting platform 4 can only move downward after the door panel 6 is closed.

[0031] When the lifting platform 4 needs to be lowered, the door panel 6 needs to be closed first. When the door panel 6 is closed and the clamping member 73 enters the insertion port 53 and the through port 724, the lifting inclined surface 733 will come into contact with the extrusion inclined surface. As the clamping member 73 gradually penetrates deeper, the lifting inclined surface 733 will gradually push the extrusion inclined surface to move the lifting block 721 upward. When the door panel 6 is completely closed, that is, the clamping member 73 is completely entered into the insertion port 53, the fixing head 723 below the lifting block 721 is now out of the limiting notch 425. At this time, the push rod of the double-headed cylinder 45 will retract, and during the process of retraction, the contact ring 451 will come into contact with the sleeve ring 441, so that the pulling rod 44 will move inward along with the push rod of the double-headed cylinder 45. At this time, the limit member 42 will also move inward and disengage from the limit opening 51. After that, the lifting platform 4 can be moved downward by the hydraulic cylinder 3. During the downward movement of the lifting platform 4, the push rod of the double-headed cylinder 45 will extend again, and the limit member 42 will abut against the column 5 under the action of the limit spring 43 and has a tendency to move outward, so as to facilitate the next rapid limit fixation of the lifting platform 4.

[0032] By setting four sets of limit members 42 for sliding left and right on the inner wall of the lifting platform 4, and providing a limit opening 51 for inserting the limit members 42 on the column 5, when the lifting platform 4 rises to the required position, the limit member 42 can be automatically inserted into the limit opening 51, thereby performing self-locking and limiting the lifting platform 4, which can partially support the lifting platform 4, avoid distributing the entire weight load of the lifting platform 4 on the push rod of the hydraulic cylinder 3, reduce the weight of the push rod of the hydraulic cylinder 3, avoid long-term excessive load causing wear of the sealing ring or unstable pressure of the hydraulic system, improve the stability of the hydraulic cylinder 3, and can prevent the lifting platform 4 from sliding down due to failure of the hydraulic cylinder 3; By arranging a locking mechanism 7 inside the column 5, the locking member 71 in the locking mechanism 7 can lock the door panel 6, and the fixing member 72 can lock the limit member 42. When the door panel 6 is in the open state, the fixing member 72 will lock the limit member 42, thereby making it impossible for the lifting platform 4 to be raised or lowered. When the lifting platform 4 is not at the highest point, the locking member 71 will automatically lock the door panel 6, making it impossible for the door panel 6 to be opened, thereby avoiding the opening in the floor when the lifting platform 4 is not at the highest point, causing people to fall, thereby improving safety.

[0033] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0034] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, "plurality" means two or more, unless otherwise specifically defined.

[0035] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A hydraulic lifting platform with a self-locking structure, characterized in that: The utility model comprises a base (1), two groups of scissor-type lifting frames (2) are symmetrically arranged at the left and right ends above the base (1), a rear fixing rod (31) is fixed at the rear side above the base (1), a front fixing rod (32) is fixed at the front side between the two groups of scissor-type lifting frames (2), a hydraulic cylinder (3) is rotatably mounted on the rear fixing rod (31), a front end of a push rod of the hydraulic cylinder (3) is rotatably connected to the front fixing rod (32), a lifting platform (4) is mounted on the top of the scissor-type lifting frame (2), a limiting slide groove (401) is symmetrically opened at the left and right ends of the lifting platform (4), and a limiting member (42) is slidably mounted in the limiting slide groove (401); A column (5) is symmetrically fixed on the left and right sides of the base (1), each of the columns (5) is penetrated on the left and right to form a limiting opening (51), the limiting member (42) is slidably placed in the limiting opening (51), a door panel (6) is installed between the two front columns (5), the left end of the door panel (6) is rotatably connected to the column (5) on the left front side through a pin shaft (61), and a locking mechanism (7) is installed inside the right front column (5), the locking mechanism (7) comprises a locking member (71) for fixing the limiting member (42), and a fixing member (72) for limiting the door panel (6).

2. The hydraulic lifting platform with a self-locking structure according to claim 1, characterized in that: A guide frame 1 (11) is fixed to the left and right ends of the upper front side of the base (1), and a guide frame 2 (41) is fixed to the left and right ends of the lower front side of the lifting platform (4). Support wheels (21) are rotatably mounted on the front ends of the two scissor-type lifting frames (2) through axle pins, and the support wheels (21) are in rolling contact with the corresponding guide frame 1 (11) and guide frame 2 (41); The upper and lower sides of the rear end of the scissor-type lifting frame (2) are rotatably connected to the base (1) and the lower surface of the lifting platform (4) via shaft pins respectively.

3. The hydraulic lifting platform with a self-locking structure according to claim 1, characterized in that: The limiting member (42) comprises a limiting rod (421) slidably inserted in the limiting groove (401); an end of the limiting rod (421) close to the column (5) is integrally formed with a limiting head (422); a portion of the upper end surface of the limiting head (422) is cut away to form an unlocking inclined surface (423); the cross section of the limiting head (422) is a right-angled triangle structure; a fixing plate is welded to the outward side surface of the limiting head (422); a limiting notch (425) is provided on the fixing plate; and an abutment wheel (424) is rotatably mounted on the inward side surface of the limiting head (422) via an axle pin; A limit spring (43) is inserted into the limit sliding groove (401), and two ends of the limit spring (43) are respectively in contact with a side of the limit rod (421) away from the column (5) and an inner wall of the limit sliding groove (401).

4. The hydraulic lifting platform with a self-locking structure according to claim 3, characterized in that: The side of the lifting platform (4) is provided with four connecting sliding openings (402), and the four connecting sliding openings (402) are respectively connected with four limiting sliding grooves (401), and a pulling rod (44) is respectively slidably arranged between two connecting sliding openings (402) relative to each other, and the pulling rod (44) is fixed to its corresponding limiting rod (421), and two sleeve rings (441) are fixed on the pulling rod (44), and a double-headed cylinder (45) is installed under the lifting platform (4), and the two push rods of the double-headed cylinder (45) are respectively slidably inserted in the two sleeve rings (441), and a contact ring (451) is fixed on the push rod of the double-headed cylinder (45).

5. The hydraulic lifting platform with a self-locking structure according to claim 3, characterized in that: A lifting groove (52) is provided on the right side surface of the right front column (5), and a plug interface (53) is provided on the front side of the column (5), the plug interface (53) is connected to the lifting groove (52), and a limiting hole (55) and a locking hole (54) are respectively provided at the bottom ends of the plug interface (53) and the lifting groove (52), and the limiting hole (55) and the locking hole (54) are both connected to the limiting opening (51); The locking member (71) includes a locking rod (711) which is slidably disposed in the lifting groove (52) up and down, the lower end of the locking rod (711) passes through the locking hole (54) and extends into the limit opening (51), the bottom end of the locking rod (711) is a hemispherical structure, and the bottom end of the locking rod (711) is in sliding contact with the unlocking inclined surface (423), a lower pressure plate (714) is sleeved and fixed on the locking rod (711), the lower pressure plate (714) is connected to a lower pressure spring (713), and the upper end of the lower pressure spring (713) is fixed to the top of the inner wall of the lifting groove (52); The locking rod (711) is provided with a locking sliding hole (712) extending through the front and rear sides thereof, and a locking block (715) is fixed to the top end of the locking sliding hole (712).

6. The hydraulic lifting platform with a self-locking structure according to claim 5, characterized in that: The fixing member (72) comprises a lifting block (721) which is slidably disposed in the plug interface (53) up and down, the top end of the lifting block (721) is connected to a compression spring (722), the upper end of the compression spring (722) is fixed to the top end of the inner wall of the plug interface (53), the lower end of the lifting block (721) is integrally formed with a fixing head (723), the lower end of the fixing head (723) is slidably inserted into the limiting hole (55) up and down, and the limiting hole (55) and the fixing head (723) are located directly above the limiting notch (425); The lifting block (721) is penetrated from front to back to form a through-hole (724), an extrusion block (725) is fixed to the front side of the top end of the through-hole (724), and an outward inclined surface at the bottom of the extrusion block (725) is designed to form an extrusion inclined surface, and the cross-section of the extrusion block (725) is a right-angled triangle structure.

7. The hydraulic lifting platform with a self-locking structure according to claim 6, characterized in that: A clamping piece (73) is welded to the right end of the rear side of the door panel (6), a lifting portion (732) is welded to the front side of the upper end of the clamping piece (73), a lifting inclined surface (733) is formed by cutting away a portion of the lifting portion (732), and the cross section of the lifting portion (732) is a right-angled triangle structure.

8. The hydraulic lifting platform with a self-locking structure according to claim 7, characterized in that: A locking opening (731) is provided at one end of the clamping member (73) away from the lifting portion (732) and passes through the upper and lower parts. When the clamping member (73) is completely inserted into the insertion port (53), the locking opening (731) is located above and below the locking block (715), and the shape and size of the locking block (715) are the same as those of the locking opening (731).

9. The hydraulic lifting platform with a self-locking structure according to claim 8, characterized in that: The clamping member (73), the through-port (724) and the locking sliding hole (712) are all designed to be arc-shaped structures, and the arc centers of the clamping member (73), the through-port (724) and the locking sliding hole (712) are colinear with the axis of the pin shaft (61) of the door panel (6).

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