A hand-propelled small-sized hydraulic lifting device

Abstract

The application discloses a hand-push type small hydraulic lifting device in the technical field of hoisting equipment, which comprises a moving base, a supporting arm provided on the moving base, a main arm hingedly connected to the top of the supporting arm, a sleeve provided on the main arm in a sliding mode, a hydraulic telescopic part hingedly connected between the sleeve and the supporting arm, a cavity provided on the outer side end of the main arm and a sub-arm inserted into the cavity; the sub-arm comprises a sleeve pipe and a movable rod slidingly inserted into the sleeve pipe; the contact areas of the cavity, the sleeve pipe and the movable rod are respectively a first cavity and a second cavity; the main arm is provided with a fixing part for fixing the movable rod; the diameter of the sleeve pipe is larger than the diameter of the second cavity; in the application, the sub-arm is composed of the sleeve pipe and the movable rod slidingly inserted into the sleeve pipe; in the process of moving and extending the sub-arm, the sleeve pipe is always in the cavity of the main arm, the contact area of the movable rod and the cavity of the main arm does not change, and the pressure inside the cavity of the main arm is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of hoisting equipment, in particular to a hand-push type small hydraulic lifting device. BACKGROUND

[0002] The crane is a kind of hoisting machinery, and the hoist is a common name of the crane, which is a multi-action hoisting machinery for vertically lifting and horizontally transporting heavy objects within a certain range.

[0003] In order to reduce the cost of lifting and transporting small-tonnage heavy objects, a small hand-push type lifting device is used, for example, a hand-push type hydraulic small hoist disclosed in the publication No. CN210393603U discloses such a small lifting device, which specifically comprises a base 1 and a lifting arm 2 connected to the base 1 through a support frame 3, and the base 1 is provided with a control arm 4 and other components at one end.

[0004] However, the device has certain limitations in use, because the lifting arm of the device is composed of two coaxial sleeve arms, by moving one set of arms to move outward from the inner cavity of the other set of arms, the length of the whole arm is adjusted, and during the movement of the arm, the contact area between the two arms gradually decreases, resulting in an increase in the force exerted by the outer arm on the inner cavity of the inner arm during lifting (the decrease in the contact area causes an increase in the local area), which easily causes the arm to deform and move, and there is a certain safety hazard. SUMMARY

[0005] The present application aims to provide a hand-push type small hydraulic lifting device to solve the problem that the contact area between the two arms gradually decreases during the movement of the arm, resulting in an increase in the force exerted by the outer arm on the inner cavity of the inner arm during lifting.

[0006] To achieve the above-mentioned purpose, the present application provides the following technical scheme: a hand-push type small hydraulic lifting device, comprising: a mobile base, the mobile base is provided with an arm, the upper side of the arm is hinged with a main arm, the main arm is slidably sleeved with a sleeve, the sleeve is provided with a bolt, the sleeve and the arm are hinged with a hydraulic telescopic piece, the hydraulic lifting device further comprises: a cavity provided on the outer side of the main arm and a secondary arm inserted in the cavity;

[0007] The outer side of the secondary arm is provided with an ear, the secondary arm comprises a sleeve and a movable rod slidably inserted in the sleeve, the contact areas of the cavity, the sleeve and the movable rod are respectively a first cavity and a second cavity, and the main arm is provided with a fixing piece for fixing the movable rod;

[0008] Among them, the diameter of the sleeve is greater than the diameter of the second cavity.

[0009] As preferred, a storage tank is arranged on the main arm, and a channel is arranged in the main arm to communicate the storage tank with the sleeve.

[0010] As preferred, a push plate for pushing the liquid in the storage tank into the channel and a spring connected with the push plate are slidably arranged in the storage tank, and a pull rope is arranged between the movable rod and the push plate.

[0011] The end of the pull rope away from the movable rod is connected with the push plate through a winding mechanism.

[0012] As preferred, the main arm comprises a main arm body and a cover body detachably arranged on the main arm body, and the storage tank is detachably arranged on the main arm body.

[0013] As preferred, a pull block is arranged on the inner end of the movable rod, a pressing piece for moving up and down and a spring connected with the pressing piece are slidably arranged on the pull block, a sliding block is arranged below the pressing piece, a sliding groove extending along the moving direction of the movable rod is arranged in the inner wall of the sleeve, the sliding block is slidably inserted in the sliding groove, the vertical section of the sliding block and the sliding groove are both T-shaped, and the sliding groove gradually inclines downward from inside to outside.

[0014] As preferred, a supporting rod is arranged on the outer end of the main arm and abuts against the movable rod, a plurality of groups of grooves are arranged on the side of the supporting rod facing the movable rod, the plurality of groups of grooves are sequentially arranged on the supporting rod along the moving direction of the movable rod, a touch switch electrically connected with the warning device is arranged in the groove, and a pressing block abutting against the movable rod and used for pressing the touch switch is slidably arranged in the groove.

[0015] As preferred, the supporting rod comprises a plurality of groups of sub-rod, a connecting rod is arranged on one side of the sub-rod, an installation groove is arranged on the other side of the sub-rod, the connecting rod is slidably inserted in the installation groove, an elastic element is arranged between the connecting rod and the installation groove, and the plurality of groups of grooves are sequentially arranged on the plurality of groups of sub-rod.

[0016] As preferred, the moving base comprises two groups of telescopic legs, a supporting piece arranged between the two groups of telescopic legs, and a handrail and a roller arranged on the telescopic leg.

[0017] As preferred, a placing groove is arranged below the moving end of the telescopic leg, and a supporting block and a spring element connected with the supporting block are hingedly arranged in the placing groove.

[0018] As preferred, a reinforcing element is arranged between the handrail and the supporting arm, and a triangular structure is formed between the reinforcing element and the supporting arm.

[0019] Compared with the prior art, the beneficial effects of the present application are that: in the present application, the auxiliary arm is composed of a sleeve and a movable rod slidingly inserted into the sleeve, during the movement and elongation of the auxiliary arm, the movable rod moves inside the sleeve, so that the sleeve is always in the cavity of the main arm, the contact area between the movable rod and the cavity of the main arm does not change, thereby ensuring that the contact area between the auxiliary arm and the cavity of the main arm does not decrease during the movement of the auxiliary arm to the outside of the main arm, reducing the pressure inside the cavity of the main arm, ensuring the stability of the auxiliary arm during lifting, and ensuring the safety during lifting. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 is a three-dimensional structural schematic diagram of the present application;

[0021] Figure 2 is a front view of the present application;

[0022] Figure 3 is a schematic diagram of the connection structure of the main arm and the auxiliary arm of the present application;

[0023] Figure 4 is an enlarged schematic diagram of the structure at A of the present application;

[0024] Figure 5 is an enlarged schematic diagram of the structure at B of the present application;

[0025] Figure 6 is an enlarged schematic diagram of the structure at C of the present application.

[0026] In the figure: 1, moving base; 101, telescopic leg; 1011, support block; 102, support piece; 103, handrail; 2, branch arm; 3, main arm; 301, main arm body; 302, cover body; 31, first cavity; 32, second cavity; 4, hydraulic telescopic piece; 5, sleeve; 6, auxiliary arm; 61, sleeve; 62, movable rod; 7, storage tank; 8, reinforcing piece; 9, winding mechanism; 10, push plate; 11, channel; 12, pull rope; 13, pull block; 14, sliding groove; 15, sliding block; 16, pressing piece; 17, support rod; 171, sub-rod; 172, connecting rod; 18, slot; 19, pressing block; 20, touch switch. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0028] Embodiment 1:

[0029] Please refer to Figure 1 andFigure 2 The utility model provides a hand -operated small -size hydraulic lifting device, include: mobile base 1, be equipped with support arm 2 on mobile base 1, support arm 2 upper hinged main arm 3, the sleeve of main arm 3 is equipped with sleeve set 5, sleeve set 5 is screwed with bolt, the fastening end of bolt inserts the hole of main arm 3 outer wall (the outer wall of main arm 3 is equipped with several groups of holes), tighten bolt, sleeve set 5 is fixed on the outer wall of main arm 3, sleeve set 5 and support arm 2 are hinged and are equipped with hydraulic telescopic piece 4, loosen bolt, move sleeve set 5, change the position of sleeve set 5 on the outer wall of main arm 3, for adjusting the initial elevation angle of main arm 3, vice arm 6, hydraulic telescopic piece 4 is also connected manual reversing valve, and manual reversing valve is installed on mobile base 1, and the hinge between support arm 2, main arm 3, sleeve set 5 and hydraulic telescopic piece 4 can be split, and sleeve set 5 can slide out from the outer wall of main arm 3, for splitting sleeve set 5 and main arm 3.

[0030] In the embodiment, as a further optimized scheme, please refer to Figure 1 And Figure 2 , mobile base 1 includes two groups of telescopic legs 101, a support 102 mounted between the two groups of telescopic legs 101, and a roller mounted below the telescopic leg 101 and a handrail 103 mounted above the telescopic leg 101; and the telescopic leg 101 includes a telescopic mother rod and a telescopic child rod slidingly inserted into the telescopic mother rod, the telescopic mother rod is externally screwed with a positioning bolt for fixing the telescopic child rod, and the telescopic child rod and the lower part of the telescopic mother rod are both mounted with a roller; the handrail 103 and the support arm 2 are provided with a reinforcing piece 8, and the reinforcing piece 8 and the support arm 2 form a triangular structure to increase the stability of the support arm 2.

[0031] In the embodiment, as a further optimized scheme, please refer to Figure 2 , a placing groove is formed below the moving end of the telescopic leg 101 (the placing groove is below the telescopic child rod), a support block 1011 is hinged in the placing groove, and a spring piece is mounted between the placing groove and the support block 1011; during the extension of the telescopic leg 101, the placing groove moves out of the telescopic mother rod, the support block 1011 is limited and disappears, the support block 1011 rotates clockwise and contacts the ground under the action of the spring piece (the clockwise rotation of the support block 1011 enables the telescopic mother rod to push the support block 1011 into the placing groove when the telescopic child rod moves towards the telescopic mother rod, facilitating the storage of the support block 1011), which has a supporting effect and avoids the insufficient supporting force caused by the excessive extension of the telescopic leg 101.

[0032] Please refer to Figure 1 , Figure 2 , Figure 3 , a cavity is formed at the end of the main arm 3 away from the support arm 2, the vice arm 6 is inserted into the cavity, and an ear is mounted on the right side end of the vice arm 6;

[0033] Wherein, the auxiliary arm 6 comprises a sleeve 61 and a movable rod 62 slidingly inserted into the sleeve 61, the end of the movable rod 62 away from the sleeve 61 extends to the outside of the main arm 3 and is connected with the lifting lug; the contact areas of the sleeve 61 and the movable rod 62 with the cavities are the first cavity 31 and the second cavity 32 respectively, the main arm 3 is provided with a fixing member (the fixing member refers to a fixing bolt, the fixing bolt is screwed on the main arm 3, and a plurality of holes are formed on the outer wall of the movable rod 62, the fastening end of the fixing bolt is inserted into the corresponding hole, and the movable rod 62 is fixed) for fixing the movable rod 62; the diameter of the sleeve 61 is larger than the diameter of the second cavity 32, so that the sleeve 61 cannot be removed from the first cavity 31; when it is necessary to adjust the auxiliary arm 6, the fixing member is loosened, then the movable rod 62 is moved, so that the auxiliary arm 6 is elongated and moves outward, in this process, the sleeve 61 does not move and is always in the first cavity 31, while the movable rod 62 moves outward, but in this way, the contact area of the movable rod 62 with the second cavity 32 does not change (the movable rod 62 cannot be completely removed from the sleeve 61), so that the contact area of the auxiliary arm 6 with the cavities of the main arm 3 does not decrease during the elongation adjustment, the stability of the auxiliary arm 6 during lifting is ensured, and the pressure on the cavities of the main arm 3 is reduced, so that the main arm 3 is protected.

[0034] In this embodiment, as a further optimized scheme, please refer to Figure 1 、 Figure 2 、 Figure 3 and Figure 4 , the main arm 3 is provided with a storage tank 7 (the storage tank 7 is filled with a liquid, specifically oil, which can be heat-conducting oil, lubricating oil and other oils that do not corrode metal), a channel 11 is formed in the main arm 3 for connecting the inner cavity of the storage tank 7 with the inner cavity of the sleeve 61 (the connection area of the channel 11 with the sleeve 61 is on the inner side of the movable rod 62); a push plate 10 is slidingly arranged in the storage tank 7, a spring is arranged between the storage tank 7 and the push plate 10 (for resetting the push plate 10 after movement), and a pull rope 12 is arranged between the movable rod 62 and the push plate 10; during the outward movement of the movable rod 62, the space in the inner cavity of the sleeve 61 will increase (the side of the sleeve 61 away from the movable rod 62 is closed, and the sleeve 61 and the movable rod 62 are sealed), so that the liquid in the storage tank 7 enters the inner cavity of the sleeve 61 to fill the space; and during the outward movement of the movable rod 62, the pull rope 12 is pulled to move the push plate 10, so that the liquid in the storage tank 7 is squeezed into the inner cavity of the sleeve 61, the liquid pressure in the inner cavity of the sleeve 61 is increased, the space in the inner cavity of the sleeve 61 is filled, so that the movable rod 62 does not have a hollow condition during the outward movement, and the probability of deformation of the sleeve 61 due to stress during lifting of the object by the movable rod 62 is reduced (if the sleeve 61 is hollow, the sleeve 61 is prone to deformation when being squeezed, which reduces the supporting force of the sleeve 61 on the movable rod 62 and affects the stability of lifting).

[0035] In this embodiment, as a further optimized solution, please refer to Figure 3 , the end of the pull rope 12 away from the movable rod 62 is connected with the push plate 10 through the winding mechanism 9; the winding mechanism 9 comprises a box body, a winding rod rotatably installed in the box body, and a torsion spring installed between the winding rod and the box body; one end of the pull rope 12 is wound on the winding rod; when the movable rod 62 moves and the pull rope 12 moves with the push plate 10, if the sleeve 61 cannot enter the liquid, the winding rod will rotate to release a part of the pull rope 12 wound on the winding rod, thereby achieving a compensation effect.

[0036] In this embodiment, as a further optimized solution, please refer to Figure 6 , the main arm 3 comprises a main arm body 301 and a cover 302, and the main arm body 301 and the cover 302 are detachably connected; the cover 302 is detached from the main arm body 301 to open the cavity of the main arm 3 (i.e., to open the first cavity 31 and the second cavity 32) for cleaning the inside of the cavity; the tank 7 is detachably installed on the main arm body 301, so that the tank 7 can be detached and opened for replacing the liquid inside the tank 7; the detachable connection is achieved by bolt fixing or other connection methods, so that the two connected parts can be separated.

[0037] In this embodiment, as a further optimized solution, please refer to Figure 3 and Figure 4 , the inner side end of the movable rod 62 is provided with a pull block 13, an opening is formed above the pull block 13, a pressing piece 16 is slidably arranged in the opening, an elastic piece is installed between the pull block 13 and the pressing piece 16, and the pull block 13 can move up and down; the lower part of the pressing piece 16 is provided with a sliding block 15, and a sliding groove 14 is formed in the lower part of the inner wall of the sleeve 61; the direction of the sliding groove 14 is the same as the moving direction of the movable rod 62, the sliding block 15 is slidably inserted into the sliding groove 14, the vertical section of the sliding block 15 and the sliding groove 14 are both T-shaped, and the sliding groove 14 gradually inclines downward from inside to outside; during the outward movement of the movable rod 62, the sliding block 15 slides in the sliding groove 14, the sliding block 15 gradually moves downward, drives the pressing piece 16 to move downward to press the elastic piece, and presses the pull block 13 downward, so as to exert a downward pressure on the inner side end of the movable rod 62 (i.e., to exert a downward force on the left end of the movable rod 62), thereby reducing the pressure on the upper part of the inner cavity of the sleeve 61 caused by the left end of the movable rod 62 during lifting, and protecting the sleeve 61 and the main arm 3.

[0038] The working mode of the hydraulic lifting device is as follows: before lifting, according to the volume, weight and lifting height of the heavy object, the sleeve 5 is moved and fixed, the initial inclination angle of the main arm 3 and the auxiliary arm 6 is adjusted, then the fixing member is loosened, the movable rod 62 is moved, the length of the auxiliary arm 6 is increased, then the fixing member is tightened to fix the movable rod 62, and the length of the telescopic support 101 is adjusted; in the lifting process, the heavy object is hung on the lifting lug of the auxiliary arm 6 through the lifting tool, the hydraulic telescopic member 4 is started to drive the main arm 3 and the auxiliary arm 6 to lift, so that the heavy object is lifted; through the switching of the manual reversing valve, the flow direction of the hydraulic oil is switched reversely, the piston rod of the hydraulic telescopic member 4 is retracted, the main arm 3 and the auxiliary arm 6 are slowly lowered, and the heavy object is lowered.

[0039] Embodiment 2:

[0040] As a further optimization, please refer to Figure 3 and Figure 5 The outer side end of the main arm 3 is provided with a support rod 17, the support rod 17 is attached to the movable rod 62, a plurality of groups of grooves 18 are formed on the side of the support rod 17 facing the movable rod 62, and the plurality of groups of grooves 18 are sequentially distributed on the support rod 17 along the moving direction of the movable rod 62 (linear distribution, the distribution direction is the same as the moving direction of the movable rod 62); a touch switch 20 is arranged in the groove 18, and the touch switch 20 is electrically connected with a warning device (the warning device refers to a sound and light alarm or an LED lamp, which can play a prompt effect) through a wire; a pressing block 19 is slidably arranged in the groove 18, a connecting spring is arranged between the pressing block 19 and the groove 18, the pressing block 19 is attached to the movable rod 62 and presses the touch switch 20, so that the warning device does not work; when the movable rod 62 is inclined and bent, the pressing block 19 at the bent part of the movable rod 62 moves to the support rod 17, the pressing of the pressing block 19 on the touch switch 20 at this part disappears, the warning device at this part is electrified and works (the number of the warning device is the same as that of the touch switch 20, and they are connected one by one), which is used to prompt the staff and make the staff know the bending condition of the auxiliary arm 6 in time, so as to avoid safety accidents.

[0041] In this embodiment, as a further optimization, please refer to Figure 5 The support rod 17 comprises a plurality of groups of sub-rods 171, one side of the sub-rod 171 is provided with a connecting rod 172, the other side of the sub-rod 171 is provided with a mounting groove, the connecting rods 172 of the adjacent two groups of sub-rods 171 are slidably inserted into the mounting grooves, and an elastic element is arranged between the connecting rod 172 and the mounting groove; and the plurality of groups of grooves 18 are sequentially distributed on the plurality of groups of sub-rods 171; in the process of moving and lengthening the movable rod 62, the connecting rod 172 moves in the mounting groove, a gap is formed between the adjacent sub-rods 171, the length of the support rod 17 is increased, the support rod 17 is adapted to the adjustment of the movable rod 62, and the right end of the support rod 17 is attached to the left side of the lifting lug and is blocked by the lifting lug, so that the support rod 17 cannot be automatically lengthened.

[0042] While embodiments of the application have been shown and described, it is to be understood that the embodiments described are merely exemplary of the principles and application of the present application. Numerous modifications and adaptions can be effected without departing from the spirit and scope of the present application, which is not limited to the exact construction and arrangement described. It is intended, therefore, to cover all modifications and adaptions that fall within the scope of the claims and their equivalents.

Claims

1. A hand-operated small hydraulic lifting device, comprising: A movable base (1) is provided with a support arm (2), a main arm (3) is hinged above the support arm (2), a kit (5) is slidably sleeved on the main arm (3), a bolt is provided on the kit (5), and a hydraulic telescopic component (4) is hinged between the kit (5) and the support arm (2). The hydraulic lifting device is characterized in that: the hydraulic lifting device further includes: a cavity provided on the outer end of the main arm (3) and a secondary arm (6) inserted into the cavity; The auxiliary arm (6) is provided with a lifting lug on its outer end. The auxiliary arm (6) includes a sleeve (61) and a movable rod (62) that slides inside the sleeve (61). The contact areas between the cavity and the sleeve (61) and the movable rod (62) are the first cavity (31) and the second cavity (32) respectively. The main arm (3) is provided with a fixing member for fixing the movable rod (62). The diameter of the sleeve (61) is larger than the diameter of the second cavity (32); The main arm (3) is provided with a storage tank (7), and a channel (11) is opened in the main arm (3) to connect the storage tank (7) with the sleeve (61); The storage tank (7) is slidably provided with a push plate (10) for pushing the liquid inside the storage tank (7) into the channel (11) and a spring connected to the push plate (10). A pull rope (12) is provided between the movable rod (62) and the push plate (10). The end of the pull rope (12) away from the movable rod (62) is connected to the push plate (10) through the winding mechanism (9); As the movable rod (62) moves outward, the empty area inside the sleeve (61) will increase, allowing the liquid inside the tank (7) to enter the sleeve (61) and fill the empty area inside the sleeve (61). As the movable rod (62) moves outward, it will pull the rope (12), moving the push plate (10) and squeezing the liquid inside the tank (7) into the sleeve (61), increasing the liquid pressure inside the sleeve (61), and filling the empty area inside the sleeve (61). This ensures that the sleeve (61) will not be empty when the movable rod (62) moves outward, reducing the probability of deformation of the sleeve (61) under stress when the movable rod (62) lifts an object.

2. The hand-push type small hydraulic lifting device according to claim 1, characterized in that: The main arm (3) includes a main arm body (301) and a cover (302) that is detachably mounted on the main arm body (301), and the storage tank (7) is detachably mounted on the main arm body (301).

3. The hand-push type small hydraulic lifting device according to claim 1, characterized in that: The inner end of the movable rod (62) is provided with a pull block (13). The pull block (13) is slidably provided with a pressing member (16) for moving up and down and an elastic member connected to the pressing member (16). A slider (15) is provided below the pressing member (16). A groove (14) extending along the moving direction of the movable rod (62) is opened below the inner wall of the sleeve (61). The slider (15) is slidably inserted into the groove (14). The vertical cross section of the slider (15) and the groove (14) are both T-shaped. The groove (14) gradually slopes downward from the inside to the outside.

4. A hand-push type small hydraulic lifting device according to claim 1, characterized in that: The outer end of the main arm (3) is provided with a support rod (17) that fits against the movable rod (62). The support rod (17) has several sets of slots (18) on the side facing the movable rod (62). The several sets of slots (18) are distributed sequentially on the support rod (17) along the moving direction of the movable rod (62). A touch switch (20) electrically connected to the alarm is provided in the slot (18). A pressure block (19) that fits against the movable rod (62) and is used to press the touch switch (20) is slidably provided in the slot (18).

5. A hand-push type small hydraulic lifting device according to claim 4, characterized in that: The support rod (17) includes several component rods (171). One side of each component rod (171) is provided with a connecting rod (172), and the other side of each component rod (171) is provided with an installation groove. The connecting rod (172) is slidably inserted into the installation groove. An elastic element is provided between the connecting rod (172) and the installation groove. Several sets of slots (18) are sequentially distributed on several component rods (171).

6. A hand-push type small hydraulic lifting device according to claim 1, characterized in that: The movable base (1) includes two sets of telescopic legs (101), a support (102) installed between the two sets of telescopic legs (101), and rollers and handrails (103) installed on the telescopic legs (101).

7. A hand-push type small hydraulic lifting device according to claim 6, characterized in that: The telescopic support leg (101) has a mounting groove below its movable end, and a support block (1011) and a spring connected to the support block (1011) are hinged in the mounting groove.

8. A hand-push type small hydraulic lifting device according to claim 6, characterized in that: A reinforcing member (8) is provided between the handrail (103) and the support arm (2), and the reinforcing member (8) and the support arm (2) form a triangular structure.

Images