Material elevator

Abstract

The invention discloses a material lifter, and belongs to the technical field of material conveying, the material lifter comprises a bottom frame, a lifting frame and a lifting platform, a lifting mechanism is arranged between the bottom frame and the lifting frame, the lifting platform is arranged at the top of the lifting frame, the lifting mechanism comprises two first connecting rods, two second connecting rods, two third connecting rods and two fourth connecting rods, the interiors of the two first connecting rods are fixedly connected with the same lower connecting shaft, the front end and the rear end of the lower connecting shaft are each provided with an overspeed locking mechanism, the interiors of the two third connecting rods are fixedly connected with the same upper connecting shaft, and the front end and the rear end of the connecting shaft are each provided with an overweight locking mechanism. The overspeed locking mechanism comprises a sliding seat, a rack, a gear, an inclined inserting plate and a fixing plate. By means of the overspeed locking mechanism and the overweight locking mechanism, locking can be achieved when overspeed operation, falling, overweight operation and overlarge shaking of the material lifting frame occur, so that loss caused by falling can be reduced, and the use safety is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of material conveying, in particular to a material elevator. Background Art

[0002] Against the backdrop of rapid development of modern industrialization, material transportation processes face many challenges, especially in the areas of aerial work and heavy load handling.

[0003] The patent document with publication number CN207293493U discloses a material conveying elevator, including a fixed component, a lifting component, a discharging component and a feeding component. The fixed component includes a first frame and a plurality of guide rods. The feeding component and the discharging component are arranged on the first frame and the discharging component is positioned higher than the feeding component. The lifting component is arranged in the fixed component and is located between the feeding component and the discharging component. The lifting component can perform lifting and lowering movements relative to the fixed component along the guide rods.

[0004] Although the material lifts in the above design and the traditional material lifts are widely used, they have obvious safety hazards. When mechanical failure occurs during transportation, it may cause serious equipment damage and casualties. In order to improve the safety performance of the material lift and reduce the losses caused by falling; therefore, we propose a material lift to solve this problem. Summary of the invention

[0005] The object of the present invention is to provide a material hoist to solve the problems raised in the above background technology.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] A material elevator, comprising: a base frame, a lifting frame and a lifting platform, a lifting mechanism is arranged between the base frame and the lifting frame, the lifting platform is arranged on the top of the lifting frame, the lifting mechanism comprises two first connecting rods, two second connecting rods, two third connecting rods and two fourth connecting rods, the two first connecting rods are fixedly connected with a same lower connecting shaft, the front and rear ends of the lower connecting shaft are both provided with an overspeed locking mechanism, the two third connecting rods are fixedly connected with a same upper connecting shaft, the front and rear ends of the connecting shaft are both provided with an overweight locking mechanism;

[0008] The overspeed locking mechanism comprises a sliding seat, a rack, a gear, an oblique plug plate and a fixed plate, the lower connecting shaft is rotatably connected to the sliding seat, a rotating shaft is rotatably installed in the sliding seat, the gear is fixedly connected to the outer side of the rotating shaft, and a plurality of oblique rods are fixedly connected to the outer side of the rotating shaft, a square plate is fixedly connected to the top of the oblique plug plate, a round rod is fixedly connected to one side of the square plate, a rotating frame is rotatably sleeved on the outer side of the round rod, a plurality of side plates are slidably sleeved on the outer side of the rotating frame, the side plates are slidably sleeved on the outer sides of the corresponding oblique rods, and the fixed plate is fixedly connected to the inside of the base frame, and a plurality of oblique slots adapted to the oblique plug plate are opened on the inner side of the fixed plate, the gear is meshed with the rack, and the rack is fixedly installed on the outer side of the base frame.

[0009] Preferably, a square groove is provided on each side of the two sliding seats close to each other, a guide protrusion is integrally formed on the side wall of the square groove, the square plate is slidably connected in the square groove, and the square plate is slidably sleeved on the outer side of the guide protrusion;

[0010] A vertical hole is provided on the inner wall of the bottom of the square groove, the oblique insert plate is slidably connected in the vertical hole, and a compression spring is fixedly connected to one side of the oblique insert plate, and the other end of the compression spring is fixedly connected to the inner wall of the vertical hole.

[0011] Preferably, the lifting mechanism further comprises a hydraulic cylinder, a lug plate is fixedly mounted on the bottom of the hydraulic cylinder, a fixed shaft is fixedly connected between the two first connecting rods, the lug plate is rotatably sleeved on the outside of the fixed shaft, a driving plate is fixedly connected to the output end of the hydraulic cylinder, a crossbeam is fixedly connected between the two third connecting rods, and the driving plate is hinged on the top of the crossbeam;

[0012] The top end of the first link is hinged to the bottom end of the corresponding third link, and the top end of the second link is hinged to the bottom end of the corresponding fourth link, the adjacent first link and the second link are rotatably connected, and the adjacent third link and the fourth link are rotatably connected, the interior of the base frame is fixedly connected with a lower mounting shaft, the first link is rotatably sleeved on the outside of the lower mounting shaft, and the interior of the lifting frame is fixedly connected with an upper mounting shaft, and the fourth link is rotatably sleeved on the outside of the upper mounting shaft.

[0013] Preferably, the overweight locking mechanism includes a movable plate, a U-shaped locking plate and a positioning rod, the upper connecting shaft is rotatably connected to the movable plate, and a square protrusion is integrally formed on the outer side of the movable plate, a plurality of grooves matching the square protrusion are formed at the bottom of the U-shaped locking plate, a positioning groove is formed on one side of the U-shaped locking plate, and the positioning rod is movably inserted into the positioning groove.

[0014] Preferably, baffles and two guide frames are fixedly installed on both the front and rear sides of the lifting frame, the U-shaped locking plate is slidably connected in the corresponding guide frame, and a compression spring is fixedly connected to the bottom of the guide frame, and the bottom end of the compression spring is fixedly connected to the U-shaped locking plate;

[0015] One end of the positioning rod is fixedly connected to a push plate, the other side of the push plate is fixedly connected to a connecting spring, and the other end of the connecting spring is fixedly connected to the baffle.

[0016] Preferably, a linkage rod is hinged on the top of the push plate, the top end of the linkage rod is hinged on the top of the lifting platform, and a cross bar is fixedly connected to the other side of the push plate, and the cross bar is slidably connected in the baffle.

[0017] Preferably, a bottom frame is fixedly installed on the bottom of the base frame, a supporting wheel is rotatably installed in the bottom frame, and a base is fixedly installed on one side of the base frame, a bottom plate is fixedly installed on the bottom of the other side of the base, a moving wheel is rotatably installed on the bottom of the bottom plate, a cylinder is fixedly connected to the top of the bottom plate, a rotating arm is rotatably sleeved on the outer side of the cylinder, a handle is rotatably connected to the inside of the rotating arm, an electric push rod is hinged on one side of the handle, and the output end of the electric push rod is hinged in the rotating arm.

[0018] Preferably, a damper and a buffer spring are fixedly connected to the bottom of the lifting platform, the bottom end of the damper is fixedly connected to the top of the lifting frame, and a support plate is fixedly connected to the inside of the lifting frame, the bottom end of the buffer spring is fixedly connected to the support plate, and multiple groups of dampers and buffer springs are provided.

[0019] Preferably, both the front and rear sides of the lifting frame are provided with square holes, the movable plate is slidably connected in the corresponding square holes, and both the front and rear sides of the base frame are provided with through holes, and the sliding seat is slidably connected in the corresponding through holes.

[0020] The beneficial effects of the present invention are:

[0021] 1. In the present invention, the material elevator described above realizes extension and retraction of the conveying end by starting the hydraulic cylinder and controlling the oil pressure, thereby adjusting the distance between the crossbeam and the fixed axis, so that the parallelogram formed by the first connecting rod, the second connecting rod, the third connecting rod and the fourth connecting rod undergoes parallelogram transformation, thereby driving the lifting frame and the lifting platform to lift and lower, thereby realizing the lifting and transporting of the material, and at the same time, the sliding seat slides left and right in the bottom frame, and the moving plate slides left and right in the square hole;

[0022] 2. In the present invention, the material elevator, when the sliding seat slides left and right, drives the rotating shaft and the gear to move synchronously, the rack drives the rotating shaft to rotate by meshing with the gear, the rotating shaft drives multiple inclined rods to rotate simultaneously, the inclined rods drive multiple side plates to rotate synchronously, and when the side plates rotate, they are thrown outward under the action of centrifugal force, and due to the inclined design of the inclined rods, the side plates move horizontally to the side away from the first connecting rod while moving away from the rotating shaft, and drive the square plate to move horizontally synchronously through the cooperation with the round rod, and drive the inclined plug plate to move synchronously, and compress the compression spring at the same time, and as the moving speed of the moving plate increases and the rotation speed of the rotating shaft increases, the amplitude of the horizontal movement of the inclined plug plate increases, so that when the lifting speed of the lifting platform is too large, the inclined plug plate is inserted into the inclined plug plate to lock the movement of the sliding seat, thereby locking the lifting platform, thereby preventing the lifting platform from overspeeding, and when running too much When the hydraulic cylinder fails during the process and causes the lifting platform and the materials on its top to fall downward, the moving speed of the lifting platform becomes faster and faster, causing the inclined plug plate to gradually insert into the inclined slot to lock the sliding seat and the lifting platform, thereby preventing the lifting platform from continuing to fall and causing an accident, and due to the inclined design of the inclined plug plate and the inclined slot, when the lifting platform moves downward and the sliding seat moves to the left, the inclined plug plate is not easy to fall out when inserted into the slot. At this time, although the lifting platform stops moving, causing the rotating shaft to stop rotating and the side plate to be not affected by the centrifugal force, the lifting platform and the top materials still press the lifting frame downward under the influence of gravity, thereby applying a leftward thrust to the sliding seat, so that the inclined plug plate is firmly stuck in the inclined slot and will not reset under the elastic force of the compression spring, thereby achieving a stable anti-falling effect. When the maintenance personnel arrive at the scene, they only need to eliminate the danger and obstacles and control the lifting platform to move upward to automatically release the lock;

[0023] 3. In the present invention, the material elevator can achieve buffering and shock absorption of materials during the lifting process of the lifting platform through the damper and the buffer spring, so that the material lifting process is more stable and internal damage is avoided. The lifting platform will move downward for a distance due to the gravity squeeze of the material, and when the material shakes during the lifting process, it will also drive the lifting platform to move up and down. During the downward movement of the lifting platform, the linkage rod will drive the push plate to move rightward and compress the connecting spring, and the push plate will drive the positioning rod to move rightward. When the lifting platform moves downward by a large enough distance, the positioning rod will come out of the positioning groove, thereby contacting the fixation of the U-shaped locking plate. Since the initial state of the compression spring is a compressed state, the U-shaped locking plate can automatically move downward under the elastic force of the compression spring after being unlocked, and the U-square protrusion of the moving plate is inserted into the groove to achieve locking, thereby limiting the up and down movement of the lifting frame, so that the elevator can be locked when the material weight is too large or a large vibration occurs, thereby avoiding falling accidents.

[0024] 4. In the present invention, the material elevator can be locked by the overspeed locking mechanism and overweight locking mechanism when the material elevator runs at overspeed, falls, runs at overweight or shakes too much, thereby reducing the losses caused by falling and improving the safety of use. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a schematic diagram of the three-dimensional structure of the material elevator proposed by the present invention;

[0026] Figure 2 for Figure 1 A partial enlarged view of part A;

[0027] Figure 3 A schematic diagram of the three-dimensional structure of the material elevator proposed by the present invention from another perspective;

[0028] Figure 4 This is a schematic diagram of the three-dimensional structure of the material elevator proposed by the present invention when viewed from above;

[0029] Figure 5 This is a schematic cross-sectional view of the material elevator proposed by the present invention;

[0030] Figure 6 It is a schematic diagram of a top view and cross-section structure of the material elevator proposed by the present invention;

[0031] Figure 7 It is a partial cross-sectional structural schematic diagram of the material elevator proposed by the present invention;

[0032] Figure 8 for Figure 7 A partial enlarged view of part B;

[0033] Fig. 9 It is a three-dimensional structural schematic diagram of the overspeed locking mechanism proposed by the present invention;

[0034] Fig.10 It is a partial three-dimensional structural schematic diagram of the overspeed locking mechanism proposed by the present invention;

[0035] Fig.11 It is a schematic diagram of the three-dimensional structure of the overweight locking mechanism proposed by the present invention.

[0036] In the figure: 1, machine base; 101, bottom plate; 102, rotating arm; 103, electric push rod; 104, handle; 105, cylinder; 2, base frame; 201, bottom frame; 3, lifting frame; 301, first connecting rod; 302, second connecting rod; 303, third connecting rod; 304, fourth connecting rod; 305, lower connecting shaft; 306, upper connecting shaft; 307, hydraulic cylinder; 4, lifting platform; 401, damper; 402, buffer spring; 5, sliding seat; 501, rotating shaft; 502, Gear; 503, rack; 504, oblique rod; 505, side plate; 506, rotating frame; 507, round rod; 508, square plate; 509, compression spring; 510, oblique plug plate; 6, movable plate; 601, square protrusion; 7, fixed plate; 701, oblique slot; 8, U-shaped locking plate; 801, groove; 802, guide frame; 803, compression spring; 9, positioning rod; 901, push plate; 902, linkage rod; 903, cross bar; 904, connecting spring; 905, baffle. DETAILED DESCRIPTION

[0037] The technical solutions in the embodiments of the present invention will be described clearly and completely 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.

[0038] Reference Figure 1 - Fig.11 , a material elevator, comprising: a base frame 2, a lifting frame 3 and a lifting platform 4, a lifting mechanism is arranged between the base frame 2 and the lifting frame 3, the lifting platform 4 is arranged on the top of the lifting frame 3, the lifting mechanism comprises two first connecting rods 301, two second connecting rods 302, two third connecting rods 303 and two fourth connecting rods 304, the two first connecting rods 301 are fixedly connected with the same lower connecting shaft 305, the front and rear ends of the lower connecting shaft 305 are both provided with an overspeed locking mechanism, the two third connecting rods 303 are fixedly connected with the same upper connecting shaft 306, the front and rear ends of the connecting shaft are both provided with an overweight locking mechanism;

[0039] The overspeed locking mechanism includes a sliding seat 5, a rack 503, a gear 502, an oblique insertion plate 510 and a fixed plate 7. The lower connecting shaft 305 is rotatably connected to the sliding seat 5. A rotating shaft 501 is rotatably installed in the sliding seat 5. The gear 502 is fixedly connected to the outer side of the rotating shaft 501, and a plurality of oblique rods 504 are fixedly connected to the outer side of the rotating shaft 501. A square plate 508 is fixedly connected to the top of the oblique insertion plate 510. A round rod 507 is fixedly connected to one side of the square plate 508. A rotating frame 506 is rotatably sleeved on the outer side of the round rod 507. A plurality of side plates 505 are slidably sleeved on the outer side of the rotating frame 506. The side plates 505 are slidably sleeved on the outer sides of the corresponding oblique rods 504. The fixed plate 7 is fixedly connected to the inside of the base frame 2, and a plurality of oblique slots 701 adapted to the oblique insertion plate 510 are provided on the inner side of the fixed plate 7. The gear 502 is meshed with the rack 503, and the rack 503 is fixedly installed on the outer side of the base frame 2.

[0040] In this embodiment, a square groove is formed on the side of the two sliding seats 5 close to each other, and a guide protrusion is integrally formed on the side wall of the square groove. The square plate 508 is slidably connected in the square groove, and the square plate 508 is slidably sleeved on the outer side of the guide protrusion;

[0041] A vertical hole is provided on the bottom inner wall of the square groove, and the inclined insert plate 510 is slidably connected in the vertical hole. A compression spring 509 is fixedly connected to one side of the inclined insert plate 510, and the other end of the compression spring 509 is fixedly connected to the inner wall of the vertical hole, so that the inclined insert plate 510 can be reset and auxiliary positioned.

[0042] In this embodiment, the lifting mechanism further includes a hydraulic cylinder 307, a lug plate is fixedly installed at the bottom of the hydraulic cylinder 307, a fixed shaft is fixedly connected between the two first connecting rods 301, the lug plate is rotatably sleeved on the outside of the fixed shaft, and a driving plate is fixedly connected to the output end of the hydraulic cylinder 307, a crossbeam is fixedly connected between the two third connecting rods 303, and the driving plate is hinged to the top of the crossbeam;

[0043] The top end of the first link 301 is hinged to the bottom end of the corresponding third link 303, and the top end of the second link 302 is hinged to the bottom end of the corresponding fourth link 304, the adjacent first link 301 and the second link 302 are rotatably connected, and the adjacent third link 303 and the fourth link 304 are rotatably connected, the bottom of the base frame 2 is fixedly connected to the bottom of the lower mounting shaft, the first link 301 is rotatably sleeved on the outside of the lower mounting shaft, and the upper mounting shaft is fixedly connected to the bottom of the lifting frame 3, and the fourth link 304 is rotatably sleeved on the outside of the upper mounting shaft.

[0044] In this embodiment, the overweight locking mechanism includes a movable plate 6, a U-shaped locking plate 8 and a positioning rod 9. The upper connecting shaft 306 is rotatably connected to the movable plate 6, and a square protrusion 601 is integrally formed on the outer side of the movable plate 6. A plurality of grooves 801 matching the square protrusion 601 are provided at the bottom of the U-shaped locking plate 8. A positioning groove is provided on one side of the U-shaped locking plate 8, and the positioning rod 9 is movably inserted in the positioning groove.

[0045] In this embodiment, baffles 905 and two guide frames 802 are fixedly installed on both the front and rear sides of the lifting frame 3, the U-shaped locking plate 8 is slidably connected in the corresponding guide frame 802, and the bottom of the guide frame 802 is fixedly connected with a compression spring 803, and the bottom end of the compression spring 803 is fixedly connected to the U-shaped locking plate 8;

[0046] One end of the positioning rod 9 is fixedly connected to a push plate 901, and the other side of the push plate 901 is fixedly connected to a connecting spring 904, and the other end of the connecting spring 904 is fixedly connected to a baffle 905 to reset the push plate 901. The top of the push plate 901 is hinged with a linkage rod 902, and the top of the linkage rod 902 is hinged to the top of the lifting platform 4, and the other side of the push plate 901 is fixedly connected to a cross bar 903, and the cross bar 903 is slidably connected in the baffle 905, thereby guiding the push plate 901.

[0047] In this embodiment, a bottom frame 201 is fixedly installed at the bottom of the base frame 2, and a supporting wheel is rotatably installed in the bottom frame 201. A base 1 is fixedly installed on one side of the base frame 2, and a bottom plate 101 is fixedly installed at the bottom of the other side of the base 1. A moving wheel is rotatably installed at the bottom of the bottom plate 101. A cylinder 105 is fixedly connected to the top of the bottom plate 101, and a rotating arm 102 is rotatably sleeved on the outer side of the cylinder 105. A handle 104 is rotatably connected to the inside of the rotating arm 102. An electric push rod 103 is hinged on one side of the handle 104, and the output end of the electric push rod 103 is hinged in the rotating arm 102.

[0048] In this embodiment, a damper 401 and a buffer spring 402 are fixedly connected to the bottom of the lifting platform 4, the bottom end of the damper 401 is fixedly connected to the top of the lifting frame 3, and the interior of the lifting frame 3 is fixedly connected to a support plate, the bottom end of the buffer spring 402 is fixedly connected to the support plate, and multiple groups of dampers 401 and buffer springs 402 are provided, thereby achieving buffering and shock absorption of the lifting platform 4.

[0049] In this embodiment, the lifting frame 3 has square holes on both the front and rear sides, and the movable plate 6 is slidably connected in the corresponding square holes. The base frame 2 has through holes on both the front and rear sides, and the sliding seat 5 is slidably connected in the corresponding through holes.

[0050] In this embodiment, when in use, by starting the hydraulic cylinder 307, the conveying end thereof is controlled by oil pressure to achieve extension and retraction, thereby adjusting the distance between the crossbeam and the fixed axis, so that the parallelogram formed by the first connecting rod 301, the second connecting rod 302, the third connecting rod 303 and the fourth connecting rod 304 undergoes a parallelogram transformation, thereby driving the lifting frame 3 and the lifting platform 4 to move up and down, thereby realizing the lifting and transporting of materials. At the same time, the sliding seat 5 slides left and right in the base frame 2, and the moving plate 6 slides left and right in the square hole, driving the rotating shaft 501 and the gear 502 to move synchronously, and the rack 503 drives the rotating shaft 501 by meshing with the gear 502. The rotating shaft 501 drives the multiple inclined rods 504 to rotate simultaneously, and the inclined rods 504 drive the multiple side plates 505 to rotate synchronously. When the side plates 505 rotate, they are thrown outward under the action of centrifugal force. Due to the inclined design of the inclined rods 504, the side plates 505 move horizontally to the side away from the first connecting rod 301 while moving away from the rotating shaft 501. The square plate 508 is driven to move horizontally synchronously with the round rod 507, and the inclined insert plate 510 is driven to move synchronously, and the compression spring 509 is compressed at the same time. As the moving speed of the moving plate 6 increases and the rotation speed of the rotating shaft 501 increases, the inclined insert plate 510 is horizontally moved. The amplitude of movement increases, so when the lifting speed of the lifting platform 4 is too large, the inclined plug plate 510 is inserted into the inclined plug plate 510 to lock the movement of the sliding seat 5, thereby locking the lifting platform 4, thereby preventing the lifting platform 4 from overspeeding, and when the hydraulic cylinder 307 fails during operation, causing the lifting platform 4 and the materials on the top thereof to fall downward, the moving speed of the lifting platform 4 becomes faster and faster, so that the inclined plug plate 510 is gradually inserted into the inclined slot 701 to lock the sliding seat 5 and the lifting platform 4, thereby preventing the lifting platform 4 from continuing to fall and causing an accident, and due to the inclined design of the inclined plug plate 510 and the inclined slot 701, the lifting platform When the lifting platform 4 moves downward and the sliding seat 5 moves to the left, the oblique insert plate 510 is not easy to fall out when inserted into the slot. At this time, although the lifting platform 4 stops moving, the rotating shaft 501 stops rotating and the side plate 505 is not affected by the centrifugal force, the lifting platform 4 and the top material still press the lifting frame 3 downward under the influence of gravity, thereby applying a leftward thrust to the sliding seat 5, so that the oblique insert plate 510 is firmly inserted into the oblique slot 701 and will not be reset under the elastic force of the compression spring 509, thereby achieving a stable anti-falling effect. When the maintenance personnel arrive at the scene, they only need to control the lifting platform 4 to move upward after eliminating the danger and obstacles to automatically release the lock;

[0051] The damper 401 and the buffer spring 402 can realize buffering and shock absorption of the material during the lifting process of the lifting platform 4, so that the material lifting process is more stable and internal damage is avoided. The lifting platform 4 will move downward for a distance due to the gravity squeeze of the material, and when the material shakes during the lifting process, it will also drive the lifting platform 4 to move up and down. During the downward movement of the lifting platform 4, the linkage rod 902 will drive the push plate 901 to move rightward and compress the connecting spring 904. The push plate 901 drives the positioning rod 9 to move rightward. When the distance moved downward by the lifting platform 4 is large enough, the positioning rod 9 will be disengaged from the positioning groove, thereby contacting the fixation of the U-shaped locking plate 8. Since the initial state of the compression spring 803 is a compressed state, the U-shaped locking plate 8 can automatically move downward under the elastic force of the compression spring 803 after being unlocked, and the U-square protrusion 601 of the moving plate 6 is inserted into the groove 801 to achieve locking, thereby limiting the up and down movement of the lifting frame 3, so that the elevator can be locked when the material weight is too large or a large vibration occurs, thereby avoiding falling accidents.

[0052] The material elevator provided by the present invention is introduced in detail above. The principle and implementation method of the present invention are explained in this article using specific embodiments. The description of the above embodiments is only used to help understand the method and core idea of ​​the present invention. It should be pointed out that for ordinary technicians in this technical field, without departing from the principle of the present invention, several improvements and modifications can be made to the present invention, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A material hoist, characterized in that: include: A base frame (2), a lifting frame (3) and a lifting platform (4), wherein a lifting mechanism is arranged between the base frame (2) and the lifting frame (3), and the lifting platform (4) is arranged on the top of the lifting frame (3), and the lifting mechanism comprises two first connecting rods (301), two second connecting rods (302), two third connecting rods (303) and two fourth connecting rods (304), wherein the two first connecting rods (301) are fixedly connected with a same lower connecting shaft (305), and the front and rear ends of the lower connecting shaft (305) are both provided with an overspeed locking mechanism, and the two third connecting rods (303) are fixedly connected with a same upper connecting shaft (306), and the front and rear ends of the connecting shaft are both provided with an overweight locking mechanism; The overspeed locking mechanism comprises a sliding seat (5), a rack (503), a gear (502), an inclined insert plate (510) and a fixed plate (7); the lower connecting shaft (305) is rotatably connected in the sliding seat (5); a rotating shaft (501) is rotatably installed in the sliding seat (5); the gear (502) is fixedly connected to the outside of the rotating shaft (501); and a plurality of inclined rods (504) are fixedly connected to the outside of the rotating shaft (501); a square plate (508) is fixedly connected to the top of the inclined insert plate (510); and a round rod (504) is fixedly connected to one side of the square plate (508). 7), the outer side of the round rod (507) is rotatably sleeved with a rotating frame (506), the outer side of the rotating frame (506) is slidably sleeved with a plurality of side plates (505), the side plates (505) are slidably sleeved on the outer sides of the corresponding inclined rods (504), and the fixed plate (7) is fixedly connected to the inside of the base frame (2), and the inner side of the fixed plate (7) is provided with a plurality of inclined slots (701) adapted to the inclined plug plate (510), the gear (502) is meshed with the rack (503), and the rack (503) is fixedly installed on the outer side of the base frame (2).

2. The material hoist according to claim 1, characterized in that A square groove is provided on the side of the two sliding seats (5) close to each other, a guide protrusion is integrally formed on the side wall of the square groove, the square plate (508) is slidably connected in the square groove, and the square plate (508) is slidably sleeved on the outer side of the guide protrusion; A vertical hole is provided on the inner wall of the bottom of the square groove, the inclined insert plate (510) is slidably connected in the vertical hole, and a compression spring (509) is fixedly connected to one side of the inclined insert plate (510), and the other end of the compression spring (509) is fixedly connected to the inner wall of the vertical hole.

3. The material hoist according to claim 1, characterized in that: The lifting mechanism also includes a hydraulic cylinder (307), a lug plate is fixedly installed at the bottom of the hydraulic cylinder (307), a fixed shaft is fixedly connected between the two first connecting rods (301), the lug plate is rotatably sleeved on the outside of the fixed shaft, and a driving plate is fixedly connected to the output end of the hydraulic cylinder (307), a crossbeam is fixedly connected between the two third connecting rods (303), and the driving plate is hinged to the top of the crossbeam; The top end of the first connecting rod (301) is hinged to the bottom end of the corresponding third connecting rod (303), and the top end of the second connecting rod (302) is hinged to the bottom end of the corresponding fourth connecting rod (304), the adjacent first connecting rod (301) and the second connecting rod (302) are rotatably connected, and the adjacent third connecting rod (303) and the fourth connecting rod (304) are rotatably connected, the bottom of the base frame (2) is fixedly connected to the inside, the first connecting rod (301) is rotatably sleeved on the outside of the lower mounting shaft, and the lifting frame (3) is fixedly connected to the inside of the upper mounting shaft, and the fourth connecting rod (304) is rotatably sleeved on the outside of the upper mounting shaft.

4. The material hoist according to claim 1, characterized in that The overweight locking mechanism comprises a movable plate (6), a U-shaped locking plate (8) and a positioning rod (9); the upper connecting shaft (306) is rotatably connected to the movable plate (6), and a square protrusion (601) is integrally formed on the outer side of the movable plate (6); a plurality of grooves (801) adapted to the square protrusion (601) are provided at the bottom of the U-shaped locking plate (8); a positioning groove is provided on one side of the U-shaped locking plate (8), and the positioning rod (9) is movably inserted into the positioning groove.

5. The material hoist according to claim 4, characterized in that A baffle (905) and two guide frames (802) are fixedly installed on both the front and rear sides of the lifting frame (3); the U-shaped locking plate (8) is slidably connected in the corresponding guide frame (802); and a compression spring (803) is fixedly connected to the bottom of the guide frame (802); and the bottom end of the compression spring (803) is fixedly connected to the U-shaped locking plate (8); One end of the positioning rod (9) is fixedly connected to a push plate (901), the other side of the push plate (901) is fixedly connected to a connecting spring (904), and the other end of the connecting spring (904) is fixedly connected to the baffle (905).

6. The material hoist according to claim 5, characterized in that The top of the push plate (901) is hinged with a linkage rod (902), the top end of which is hinged to the top of the lifting platform (4), and the other side of the push plate (901) is fixedly connected with a cross bar (903), which is slidably connected in the baffle (905).

7. The material hoist according to claim 5, characterized in that A bottom frame (201) is fixedly mounted on the bottom of the base frame (2), support wheels are rotatably mounted inside the bottom frame (201), a base (1) is fixedly mounted on one side of the base frame (2), a bottom plate (101) is fixedly mounted on the bottom of the other side of the base (1), and moving wheels are rotatably mounted on the bottom of the bottom plate (101).

8. The material hoist according to claim 7, characterized in that A cylinder (105) is fixedly connected to the top of the base plate (101); a rotating arm (102) is rotatably sleeved on the outer side of the cylinder (105); a handle (104) is rotatably connected to the inside of the rotating arm (102); an electric push rod (103) is hingedly connected to one side of the handle (104); and an output end of the electric push rod (103) is hingedly connected inside the rotating arm (102).

9. The material hoist according to claim 1, characterized in that A damper (401) and a buffer spring (402) are fixedly connected to the bottom of the lifting platform (4); the bottom end of the damper (401) is fixedly connected to the top of the lifting frame (3); a support plate is fixedly connected to the inside of the lifting frame (3); the bottom end of the buffer spring (402) is fixedly connected to the support plate; and the damper (401) and the buffer spring (402) are both provided in multiple groups.

10. The material hoist according to claim 5, characterized in that The lifting frame (3) is provided with square holes on both the front and rear sides, and the movable plate (6) is slidably connected in the corresponding square holes. The base frame (2) is provided with through holes on both the front and rear sides, and the sliding seat (5) is slidably connected in the corresponding through holes.

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