CN217374288U - Arm-pulling hook mechanism and arm-hooking vehicle - Google Patents

Abstract

The utility model provides a single arm-drag hook mechanism and hook arm car, wherein, single arm-drag hook mechanism includes single arm-drag hook body, sets up on single arm-drag hook body and is suitable for pneumatic cylinder and the hydraulic flow control structure of drive single arm-drag hook body, and the pneumatic cylinder have the pole chamber and the no pole chamber all with hydraulic flow control structural connection. The utility model realizes the corresponding movement of the body of the draw-arm hook by arranging the hydraulic flow adjusting structure to drive the piston rod of the hydraulic cylinder to perform the corresponding movement; the hydraulic flow regulation structure slowly falls when reducing the hydraulic oil flow that supplies to having the pole chamber when the box loads in order to realize the box and load, slowly falls when supplying to the hydraulic oil flow that does not have the pole chamber when unloading through reducing the box, effectively avoids producing great impact and causes the damage to special equipment in box and the box among the box loading and unloading process for the hook arm car that possesses the single arm hook mechanism is suitable for the transport loading to have the box of special equipment such as medical equipment, fire-fighting equipment.

Description

Arm-pulling hook mechanism and arm-hooking vehicle

Technical Field

The utility model relates to an engineering machine tool field particularly, relates to a single arm-drag hook mechanism and hook arm car.

Background

With the development of the technology of the draw arm hook (draw arm type self-loading and unloading device), the application field of the hook arm vehicle with the draw arm hook is more and more extensive, and the requirement of a user on the operation action of the draw arm hook on the hook arm vehicle is higher. For example, when the hook arm vehicle is used for transporting a box body loaded with special equipment such as medical equipment, the pull arm hook is required to realize slow descending during loading and unloading of the box body, so that damage to the box body and the special equipment in the box body due to large impact generated in the loading and unloading process of the box body is avoided. However, the draw arm hooks of most existing hook arm vehicles cannot realize slow descending in the box loading and unloading process or can only realize slow descending in the boxing process, and cannot meet the transportation requirements of special equipment.

SUMMERY OF THE UTILITY MODEL

The utility model provides a problem be: how to realize the slow descending of the box body during loading and unloading.

In order to solve the problem, the utility model provides a single arm-drag hook mechanism, be in including single arm-drag hook body, setting on the single arm-drag hook body and be suitable for the drive the pneumatic cylinder and the hydraulic flow regulation structure of single arm-drag hook body, just the pneumatic cylinder have the pole chamber and no pole chamber all with hydraulic flow regulation structural connection.

Optionally, the single arm-drag hook body includes hook arm, linking arm and chassis girder, the hook arm with linking arm sliding connection and/or rotation are connected, the linking arm with the chassis girder rotates to be connected, the cylinder body and the piston rod of pneumatic cylinder respectively with the chassis girder with the linking arm rotates to be connected.

Optionally, the hydraulic flow adjusting structure includes an oil pump and a valve set, the oil pump supplies oil to the rod chamber or the rodless chamber through the valve set, and the valve set is adapted to adjust the flow of hydraulic oil supplied to the rod chamber or the rodless chamber.

Optionally, the valve set comprises a multi-way valve and a bidirectional balance valve, and the multi-way valve is used for supplying hydraulic oil provided by the oil pump to the rod cavity or the rodless cavity through the bidirectional balance valve; and the multi-way valve is used for adjusting the flow of the hydraulic oil supplied to the rod cavity or the rodless cavity.

Optionally, the multiway valve includes a reversing valve, a first oil path, a second oil path, and a third oil path, the first oil path is provided with a first electromagnetic valve, the second oil path is provided with a first throttle hole or a first throttle valve, and the third oil path is provided with a first overflow valve; one end of each of the first oil path, the second oil path and the third oil path is communicated with an oil outlet of the oil pump, the other end of each of the first oil path and the second oil path is communicated with an oil inlet of the reversing valve, and the other end of each of the third oil path and an oil return port of the reversing valve are communicated with an oil tank; and a first working oil port of the reversing valve is communicated with one of the rod cavity or the rodless cavity through the bidirectional balance valve, and a second working oil port of the reversing valve is communicated with the other of the rod cavity or the rodless cavity through the bidirectional balance valve.

Optionally, the bidirectional balance valve includes a first check valve, a second overflow valve and a third overflow valve, an oil inlet of the first check valve and an oil outlet of the second overflow valve are both communicated with the first working oil port, and an oil inlet of the second check valve and an oil outlet of the third overflow valve are both communicated with the second working oil port; the oil outlet of the first check valve and the oil inlet of the second overflow valve are both communicated with the rod cavity, and the oil outlet of the second check valve and the oil inlet of the third overflow valve are both communicated with the rodless cavity; and a control oil port of the second overflow valve is communicated with the oil inlet or the oil outlet of the second check valve, and a control oil port of the third overflow valve is communicated with the oil inlet or the oil outlet of the first check valve.

Optionally, the bidirectional balance valve further includes a third check valve, a fourth check valve and a second solenoid valve, an oil outlet of the second overflow valve is connected with an oil inlet of the first check valve through the second solenoid valve and the fourth check valve, an oil outlet of the second overflow valve is communicated with an oil inlet of the second solenoid valve, an oil outlet of the second solenoid valve is communicated with an oil inlet of the fourth check valve, and an oil outlet of the fourth check valve is communicated with an oil inlet of the first check valve; and the oil inlet of the third one-way valve is communicated with the oil outlet of the second overflow valve, and the oil outlet of the third one-way valve is communicated with the oil outlet of the second one-way valve.

Optionally, a control oil port of the second overflow valve is communicated with an oil inlet of the second check valve through a fourth oil path, and the fourth oil path is provided with a second throttle hole or a second throttle valve; and a control oil port of the third overflow valve is communicated with an oil inlet of the first one-way valve through a fifth oil path, and the fifth oil path is provided with a third throttling hole or a third throttling valve.

Optionally, the draw arm hook mechanism further comprises a position detection structure, and the position detection structure is arranged on the draw arm hook body and/or the hydraulic cylinder and is used for detecting the position of a box body of the hook arm vehicle; when the position detection structure detects that the box body moves to a falling slow-descending position in the loading process, the valve group reduces the flow of hydraulic oil supplied to the rod cavity; when the position detection structure detects that the box body moves to a landing slow-descending position in the unloading process, the valve group reduces the flow of hydraulic oil supplied to the rodless cavity; when the position detection structure detects that the box body does not move to the landing slow-descending position in the unloading process, the valve group lifts the flow of the hydraulic oil supplied to the rodless cavity.

In order to solve the above problem, the utility model also provides a hook arm car, include as above arm-drag hook mechanism.

Compared with the prior art, the utility model, following beneficial effect has: through setting up hydraulic pressure flow control structure to the piston rod of drive pneumatic cylinder carries out corresponding motion, realizes the corresponding motion of pull arm hook body. The hydraulic flow control structure slowly falls when reducing the hydraulic oil flow that supplies to having the pole chamber when the box loads in order to realize the box and load, slowly falls when supplying to the hydraulic oil flow that does not have the pole chamber when unloading through reducing the box, can play certain guard action to the article that load in box and the box, effectively avoided the box loading and unloading in-process to produce great impact promptly and cause the damage to the article that load in box and the box, make the hook arm car that possesses hydraulic flow control structure and single arm hook mechanism be suitable for the transportation loading to have medical equipment, the box of special equipment such as fire-fighting equipment, in order to guarantee medical equipment, the transportation safety of special equipment such as fire-fighting equipment. Moreover, the hydraulic flow regulating structure can also increase the flow of the hydraulic oil supplied to the rodless cavity to increase the unloading rate of the box body in the unloading process when the box body is in the unloading process and does not move to the landing slow-descending position (namely before the box body arrives at the landing slow-descending position in the unloading process).

Drawings

Fig. 1 is a schematic structural view of the connection between the body of the boom hook and the hydraulic cylinder, the hydraulic flow regulating structure, the position detecting structure and the oil tank in the embodiment of the present invention;

fig. 2 is a schematic connection diagram of the boom hook body, the hydraulic cylinder, the hydraulic flow adjusting structure and the position detecting structure in the embodiment of the present invention;

fig. 3 is a schematic structural view of the connection between the body of the arm hook and the box body in the embodiment of the present invention;

fig. 4 is a schematic structural diagram of the embodiment of the present invention, in which the hydraulic flow control structure is connected to the oil tank and the hydraulic cylinder.

Description of reference numerals:

1-a pull arm hook body, 11-a hook arm, 12-a connecting arm and 13-an underframe crossbeam; 2-hydraulic cylinder, 21-rod cavity, 22-rodless cavity, 23-cylinder body, 24-piston rod; 3-hydraulic flow adjusting structure, 31-oil pump, 32-valve group, 321-multi-way valve, 3211-reversing valve, 3212-first oil path, 3212 a-first electromagnetic valve, 3213-second oil path, 3214-third oil path, 3214 a-first overflow valve, 322-two-way balance valve, 3221-first check valve, 3222-second check valve, 3223-third check valve, 3224-fourth check valve, 3225-second overflow valve, 3226-third overflow valve, 3227-second electromagnetic valve, 3228-fourth oil path, 3229-fifth oil path; 4-a position detection structure; 5-an oil tank; 6-box body.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention more comprehensible, embodiments accompanied with figures are described in detail below.

In the XYZ coordinate axes provided herein, the forward direction of the X axis represents the forward direction, the reverse direction of the X axis represents the backward direction, the forward direction of the Y axis represents the right direction, the reverse direction of the Y axis represents the left direction, the forward direction of the Z axis represents the upward direction, and the reverse direction of the Z axis represents the downward direction. Also, it is noted that the terms "first," "second," and the like in the description and claims of the present invention and in the above-described drawings are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or otherwise described herein.

With reference to fig. 1-3, an embodiment of the present invention provides a single arm-drag hook mechanism, which includes a single arm-drag hook body 1, a hydraulic cylinder 2 and a hydraulic flow control structure 3, the hydraulic cylinder 2 is disposed on the single arm-drag hook body 1 and is suitable for driving the single arm-drag hook body 1, and the rod cavity 21 and the rodless cavity 22 of the hydraulic cylinder 2 are both connected to the hydraulic flow control structure 3.

In this embodiment, the arm-pulling hook mechanism is applied to a self-loading and unloading vehicle such as a hook arm vehicle, and is used for loading and unloading the box 6 on the hook arm vehicle. The draw arm hook body 1 of the draw arm hook mechanism is directly arranged on a frame of the hook arm vehicle, and the box body 6 is driven by the draw arm hook body 1 to realize loading and unloading on the hook arm vehicle. The hydraulic cylinder 2 of the drag hook mechanism is provided on the drag hook body 1 (described later) to drive the drag hook body 1 to perform corresponding operations, for example, a box loading operation, a box unloading operation, etc., by extending and contracting the hydraulic cylinder 2. The hydraulic flow regulating structure 3 is used for supplying hydraulic oil to the hydraulic cylinder 2 and regulating the flow of the hydraulic oil supplied to the hydraulic cylinder 2 so as to regulate the corresponding action of the hydraulic cylinder 2 and simultaneously realize the recovery of the hydraulic oil in the hydraulic cylinder 2; specifically, the hydraulic cylinder 2 is preferably a piston cylinder, and comprises a cylinder body 23 and a piston rod 24, the piston of the piston rod 24 divides the interior of the cylinder body 23 into a rod cavity 21 and a rod-free cavity 22, and the hydraulic flow regulating structure 3 is connected and communicated with the rod cavity 21 and the rod-free cavity 22 of the hydraulic cylinder 2 through different pipelines, so that when the box body 6 is loaded, the piston rod 24 of the hydraulic cylinder 2 is recovered (the hydraulic flow regulating structure 3 supplies oil to the rod cavity 21), and when the draw-arm hook body 1 drives the box body 6 to move to a falling descent slow-falling position (i.e. a position where the front end of the box body 6 has a certain distance from the position when the loading is completed), the hydraulic flow regulating structure 3 reduces the flow of the hydraulic oil supplied to the rod cavity 21 to reduce the recovery rate of the piston rod 24, i.e. the piston rod 24 is slowly withdrawn to realize slow-falling when the box body 6 is loaded until the loading of the box body 6 is completed; when the box 6 unloads, the piston rod 24 of pneumatic cylinder 2 stretches out (hydraulic pressure flow control structure 3 supplies oil to rodless cavity 22), when the arm-drag hook body 1 drive box 6 and move to the position of falling to the ground slowly (namely the position that the box 6 front end has certain distance apart from the ground position when the uninstallation was accomplished), hydraulic pressure flow control structure 3 reduces the hydraulic oil flow that supplies to rodless cavity 22 to reduce the rate of stretching out of piston rod 24, even make piston rod 24 stretch out slowly, realize the slow descending when box 6 uninstalls.

In this way, by providing the hydraulic flow adjusting structure 3 to drive the piston rod 24 of the hydraulic cylinder 2 to perform corresponding movement, the corresponding movement of the draw arm hook body 1 is realized. The hydraulic flow control structure 3 slowly falls when supplying to the hydraulic oil flow that has pole chamber 21 when reducing box 6 and loading in order to realize that box 6 loads, slowly falls when supplying to rodless chamber 22 when unloading through reducing box 6, can play certain guard action to the article that load in box and the box, the article that load in box 6 and the box caused the damage to the article that load in box 6 and the box 6 of producing great impact in the box 6 handling process has effectively been avoided promptly, make the hook arm car that possesses hydraulic flow control structure 3 and arm-pulling hook mechanism be suitable for the transportation loading to have medical equipment, the box 6 of special equipment such as fire-fighting equipment, in order to guarantee medical equipment, the transportation safety of special equipment such as fire-fighting equipment. Moreover, the hydraulic flow regulating structure 3 can also increase the flow of hydraulic oil supplied to the rodless chamber 22 to increase the unloading rate of the tank 6 during unloading when the tank 6 is in the unloading process and is not moved to the landing slow-descent position (i.e., before the tank 6 reaches the landing slow-descent position during unloading).

Alternatively, as shown in fig. 1 to 3, the arm-pulling hook body 1 includes a hook arm 11, a connecting arm 12 and an underframe girder 13, the hook arm 11 is connected with the connecting arm 12 in a sliding and/or rotating manner, the connecting arm 12 is connected with the underframe girder 13 in a rotating manner, and a cylinder body 23 and a piston rod 24 of the hydraulic cylinder 2 are respectively connected with the underframe girder 13 and the connecting arm 12 in a rotating manner.

The draw arm hook body 1 comprises a hook arm 11, a connecting arm 12 and an underframe girder 13, and the draw arm hook body is fixed on a frame of a hook arm vehicle through the underframe girder 13 so as to ensure the stability of the draw arm hook body 1 when driving the box body 6. The connecting arm 12 is rotatably connected with the underframe girder 13, so that on one hand, the hook arm 11 and the connecting arm 12 rotate relative to the underframe girder 13, and the smooth loading and unloading of the box body 6 of the draw arm hook body 1 are ensured; on the other hand, the arrangement of a dumping arm is omitted from the draw arm hook body 1, the structure of the draw arm hook body 1 is simplified, the cost and the weight of the draw arm hook body 1 can be effectively reduced, and the draw arm hook body 1 and the draw arm vehicle with the same are suitable for transporting the box body 6 loaded with special equipment (not suitable for dumping and unloading) such as medical equipment and fire fighting equipment. The hook arm 11 is used for directly connecting (hooking) the box body 6, and the hook arm 11 is connected with the connecting arm 12 in a sliding and/or rotating manner, so as to adjust the relative position of the hook arm 11 and the connecting arm 12 and lift the movement range of the hook arm 11, thereby expanding the applicable environment of the draw-arm hook body 1 and the box body 6 to which the same is applicable (i.e. enabling the hook arm 11 to be capable of loading and unloading the box bodies 6 with different sizes). The cylinder body 23 of the hydraulic cylinder 2 is rotatably connected with the underframe girder 13, on one hand, the hydraulic cylinder 2 is connected with the underframe girder 13 through the cylinder body 23, so that the arrangement of a pipeline connected with the cylinder body 23 is facilitated, and the pipeline connected with the cylinder body 23 is prevented from being interfered by the movement of the connecting arm 12 and the like; on the other hand, the cylinder 23 is rotatably connected to the undercarriage girder 13 to ensure that the connecting arm 12 and the undercarriage girder 13 can be smoothly rotated relatively. The piston rod 24 is rotatably connected to the connecting arm 12 to drive the connecting arm 12 to rotate relative to the undercarriage girder 13 by extension and contraction of the piston rod 24 of the hydraulic cylinder 2.

Alternatively, as shown in fig. 1 to 4 in combination, the hydraulic flow rate adjusting structure 3 includes an oil pump 31 and a valve block 32, the oil pump 31 supplies oil to the rod chamber 21 or the rodless chamber 22 through the valve block 32, and the valve block 32 is adapted to adjust the flow rate of the hydraulic oil supplied to the rod chamber 21 or the rodless chamber 22.

In this embodiment, an oil inlet of an oil pump 31 of the hydraulic flow rate adjusting structure 3 is connected (via a corresponding pipeline) to an oil tank 5 (for storing hydraulic oil), and an oil outlet of the oil pump 31 is connected to an oil inlet of a valve block 32, so as to suck oil from the oil tank 5 via the oil pump 31 and pump high-pressure oil to the valve block 32. The corresponding working oil ports of the valve group 32 are respectively connected with the rod cavity 21 and the rodless cavity 22 through different pipelines, so that the hydraulic oil provided by the oil pump 31 is supplied to the rod cavity 21 or the rodless cavity 22 through the valve group 32, when the valve group 32 supplies the hydraulic oil to one of the rod cavity 21 and the rodless cavity 22 through one working oil port, the hydraulic oil in the other one of the rod cavity 21 and the rodless cavity 22 returns through the other working oil port of the valve group 32 and flows to the oil tank 5 through the oil return port of the valve group 32, and therefore smooth extension and retraction of the hydraulic cylinder 2 are guaranteed.

Moreover, the valve set 32 is adapted to regulate the flow of hydraulic oil to the rod chamber 21 or the rodless chamber 22, for example, when the tank 6 is loaded, the valve set 32 reduces the flow of hydraulic oil to the rod chamber 21 to reduce the recovery rate of the piston rod 24, i.e., to make the piston rod 24 slowly retract, to achieve slow descent when the tank 6 is loaded; when the tank 6 is unloaded, the valve block 32 reduces the flow rate of the hydraulic oil supplied to the rodless chamber 22 to reduce the extension rate of the piston rod 24, i.e., to make the piston rod 24 extend slowly, thereby realizing slow descent when the tank 6 is unloaded. Thus, the hydraulic flow rate adjusting structure 3 directly adjusts the flow rate of the hydraulic oil supplied to the rod cavity 21 or the rodless cavity 22 through the valve group 32, on one hand, the oil pump 31 does not need to adjust power to adjust the flow rate of the output hydraulic oil, the control valve group 32 is simpler and more convenient compared with the control oil pump 31, and the control difficulty and the control cost of the hydraulic flow rate adjusting structure 3 are reduced; on the other hand, the oil pump 31 of the hydraulic flow adjusting structure 3 can adopt a fixed displacement pump which has a simpler structure, a lower failure rate, a lower cost and a more convenient maintenance, so as to reduce the maintenance difficulty and the use cost of the hydraulic flow adjusting structure 3 and the pull arm hook mechanism.

Optionally, as shown in fig. 1 to fig. 3, the boom hook mechanism further includes a position detecting structure 4, where the position detecting structure 4 is disposed on the boom hook body 1 and/or the hydraulic cylinder 2 and is used for detecting a position of the box 6 of the boom truck; when the position detection structure 4 detects that the box 6 moves to the falling slow-descending position in the loading process, the valve group 32 reduces the flow of the hydraulic oil supplied to the rod cavity 21; when the position detection structure 4 detects that the tank 6 moves to the landing slow-lowering position in the unloading process, the valve group 32 reduces the flow of the hydraulic oil supplied to the rodless chamber 22; when the position detecting structure 4 detects that the tank 6 has not moved to the landing descent-control position during unloading, the valve block 32 raises the flow rate of the hydraulic oil supplied to the rodless chamber 22.

In this embodiment, the position detection structure 4 is disposed on the boom hook body 1 and/or the hydraulic cylinder 2 to detect the position of the piston rod 24 (or piston) of the boom hook body 1 or the hydraulic cylinder 2, so as to determine the position of the box 6 for the hydraulic flow regulation structure 3 to perform corresponding actions. Among them, the position detecting structure 4 includes a distance sensor or the like, which can be provided on the draw arm hook body 1 to detect the position of a connecting arm 12 (described later) of the draw arm hook body 1; can be arranged on the piston rod 24 or the cylinder 23 to detect the position of the piston or the piston rod 24; the position detection device can also be arranged on the piston rods 24 (or pistons) of the pull arm hook body 1 and the hydraulic cylinder 2, and the accuracy of the position detection of the box body 6 can be further improved by comparing the detection data of the position detection structure 4 on the piston rods 24 (or pistons) of the pull arm hook body 1 and the hydraulic cylinder 2.

When the position detection structure 4 detects that the box 6 moves to the falling slow-descending position in the loading process, the flow of the hydraulic oil supplied to the rod cavity 21 by the oil pump 31 is reduced through the valve group 32, so that slow descending of the box 6 in the loading process is realized. When the position detection structure 4 detects that the tank 6 moves to the landing slow-descending position in the unloading process, the flow of the hydraulic oil supplied to the rodless cavity 22 by the oil pump 31 is reduced through the valve group 32, so that slow descending during the unloading of the tank 6 is realized. When the position detecting structure 4 detects that the box 6 is in the unloading process and does not move to the landing slow-descending position, the flow of the hydraulic oil supplied to the rodless cavity 22 is increased through the valve group 32, so that the unloading speed of the box 6 in the unloading process is increased, the quick box unloading is realized, and the box unloading time is saved.

The valve group 32 adjusts the flow rate of oil supply to the rod cavity 21 or the rodless cavity 22 according to the detection result of the position detection structure 4 on the position of the box body 6, and the adjustment can be realized through automatic control or manual control. For automatic control, the position detection structure 4, the valve group 32 and the like are connected with a controller, and the controller controls the valve group 32 to perform corresponding operation according to the position of the box body 6 detected by the position detection structure 4. For manual control, the position detecting structure 4 may be a distance sensor with digital display, so that corresponding personnel can directly observe the moving position of the box body 6 in a cab, and then the manual control valve group 32 adjusts the oil supply to the rod cavity 21 and the rodless cavity 22.

Alternatively, as shown in connection with fig. 1-3, the position detecting structure 4 includes a distance sensor provided on the drag hook body 1 and/or the hydraulic cylinder 2.

In the present embodiment, the position detecting structure 4 is preferably a distance sensor (displacement sensor), such as a linear displacement sensor, an angular displacement sensor, or the like, for determining the position of the box 6 by detecting the position of the piston rod 24 (or piston) of the drag hook body 1 or the hydraulic cylinder 2, which is provided on the drag hook body 1 and/or the hydraulic cylinder 2. Illustratively, a linear displacement sensor is arranged on at least one of the underframe girder 13, the connecting arm 12 and the frame of the draw arm hook body 1, and the position of the box body 6 is determined by detecting the position of the connecting arm 12; or the angular displacement sensor is arranged at the rotary connection position of the hydraulic cylinder 2 and the connecting arm 12 or the rotary connection position of the connecting arm 12 and the underframe girder 13, and the position of the box body 6 is determined by detecting the relative rotation angle of the connecting arm 12 relative to the hydraulic cylinder 2 or the relative rotation angle of the connecting arm 12 relative to the underframe girder 13.

Alternatively, as shown in fig. 1 to 4, the valve block 32 includes a multi-way valve 321 and a two-way balancing valve 322, the multi-way valve 321 is used for supplying the hydraulic oil provided by the oil pump 31 to the rod chamber 21 or the rod-less chamber 22 through the two-way balancing valve 322; and the multiplex valve 321 is used to regulate the flow rate of the hydraulic oil supplied to the rod chamber 21 or the rodless chamber 22.

In this embodiment, the multi-way valve 321 is used for reversing the hydraulic oil provided by the oil pump 31 to supply the hydraulic oil to the rod chamber 21 or the rod-less chamber 22 (via the two-way balance valve 322), so as to extend and retract the piston rod 24; and the multi-way valve 321 is used for adjusting the flow of the hydraulic oil supplied to the rod chamber 21 or the rodless chamber 22, so as to adjust the expansion and contraction speed of the hydraulic cylinder 2. The two-way balance valve 322 is disposed between the multi-way valve 321 and the hydraulic cylinder 2, and can ensure the stability of oil supply and oil return of the hydraulic cylinder 2, and ensure that when one of the rod cavity 21 and the rodless cavity 22 supplies oil, the other one can return oil smoothly, thereby ensuring the smooth extension and retraction of the hydraulic cylinder 2. The valve group 32 directly adjusts the flow rate of the hydraulic oil supplied to the rod chamber 21 or the rodless chamber 22 through the multi-way valve 321, so that the arm-pulling hook mechanism can realize various loading and unloading box actions under the condition that the power of the oil pump 31 is unchanged (the flow rate is unchanged), and the arm-pulling hook mechanism can adopt a fixed displacement pump and the like having the advantages of low cost, convenience in maintenance and the like as the oil pump 31.

Optionally, as shown in fig. 4, the multi-way valve 321 includes a reversing valve 3211, a first oil path 3212, a second oil path 3213, and a third oil path 3214, where the first oil path 3212 is provided with a first electromagnetic valve, the second oil path 3213 is provided with a first throttle or a first throttle, and the third oil path 3214 is provided with a first relief valve; one end of each of a first oil path 3212, a second oil path 3213 and a third oil path 3214 is communicated with an oil outlet of the oil pump 31, the other end of each of the first oil path 3212 and the second oil path 3213 is communicated with an oil inlet of the reversing valve 3211, and the other end of the third oil path 3214 and an oil return port of the reversing valve 3211 are communicated with the oil tank 5; a first working oil port of the direction valve 3211 is communicated with one of the rod chamber 21 or the rodless chamber 22 through the bidirectional balance valve 322, and a second working oil port of the direction valve 3211 is communicated with the other of the rod chamber 21 or the rodless chamber 22 through the bidirectional balance valve 322.

In this embodiment, when the position detecting structure 4 detects that the draw arm hook body 1 drives the box 6 to move to the car-dropping slow-descending position in the loading process of the box 6, the first electromagnetic valve is de-energized, that is, the first electromagnetic valve disconnects the second oil path 3213, so that the high-pressure oil pumped out by the oil pump 31 is supplied to the reversing valve 3211 only through the first orifice (or the first throttle) of the second oil path 3213, at this time, the side pressure of the oil inlet of the first relief valve in the third oil path 3214 rises (the oil inlet of the first relief valve is communicated with the control oil port thereof) until the first relief valve is opened, and part of the high-pressure oil pumped out by the oil pump 31 directly returns to the oil tank 5 through the oil outlet of the first relief valve of the third oil path 3214, so that only part of the high-pressure oil pumped out by the oil pump 31 is supplied to the rod chamber 21 through the second oil path 3213, the reversing valve 3211 and the bidirectional balance valve 322, thereby realizing slow descending when the loading of the box 6. Similarly, when the position detecting structure 4 detects that the draw-arm hook body 1 drives the box 6 to move to the landing slow-lowering position during the unloading process of the box 6, the first solenoid valve is de-energized, that is, the first solenoid valve disconnects the second oil path 3213, so that the high-pressure oil pumped by the oil pump 31 is supplied to the reversing valve 3211 only through the first orifice (or the first throttle valve) of the second oil path 3213, at this time, the side pressure of the oil inlet of the first relief valve in the third oil path 3214 is increased (the oil inlet of the first relief valve is communicated with the control oil port thereof) until the first relief valve is opened, and part of the high-pressure oil pumped by the oil pump 31 directly returns to the oil tank 5 through the oil outlet of the first relief valve of the third oil path 3214, so that part of the high-pressure oil pumped by the oil pump 31 is supplied to the rodless cavity 22 through the second oil path 3213, the reversing valve 3211 and the bidirectional balance valve 322, thereby realizing the slow-lowering during the unloading of the box 6. When the position detecting structure 4 detects that the box 6 is in the loading process and does not move to the falling slow-descending position (i.e. before the box 6 reaches the falling slow-descending position in the loading process), or detects that the box 6 is in the unloading process and does not move to the falling slow-descending position, the first electromagnetic valve is energized, so that the first oil path 3212 is communicated with the oil outlet of the oil pump 31 and the oil inlet of the reversing valve 3211, and the high-pressure oil pumped out by the oil pump 31 is supplied to the reversing valve 3211 through the first electromagnetic valve of the first oil path 3212 and the first throttle (or the first throttle valve) of the second oil path 3213 and is supplied to one of the rod chamber 21 and the rodless chamber 22 through the reversing valve 3211 and the bidirectional balance valve 322, thereby ensuring the normal expansion rate of the piston rod 24.

Optionally, the first electromagnetic valve may be a normally open electromagnetic valve or a normally closed electromagnetic valve, and when the first electromagnetic valve is a normally open electromagnetic valve, the first electromagnetic valve is powered on and closed and powered off and opened; when the first electromagnetic valve is a normally closed electromagnetic valve, the first electromagnetic valve is powered on and is powered off and closed.

Optionally, as shown in fig. 4, the bidirectional balancing valve 322 includes a first check valve 3221, a second check valve 3222, a second overflow valve 3225, and a third overflow valve 3226, an oil inlet of the first check valve 3221 and an oil outlet of the second overflow valve 3225 are both communicated with the first working oil port, and an oil inlet of the second check valve 3222 and an oil outlet of the third overflow valve 3226 are both communicated with the second working oil port; an oil outlet of the first check valve 3221 and an oil inlet of the second overflow valve 3225 are both communicated with the rod cavity 21, and an oil outlet of the second check valve 3222 and an oil inlet of the third overflow valve 3226 are both communicated with the rodless cavity 22; a control oil port of the second overflow valve 3225 is communicated with an oil inlet or an oil outlet of the second check valve 3222, and a control oil port of the third overflow valve 3226 is communicated with an oil inlet or an oil outlet of the first check valve 3221.

The first working oil port is communicated with the oil inlet of the first check valve 3221, and the second working oil port is communicated with the oil inlet of the second check valve 3222. When the position detection structure 4 detects that the draw arm hook body 1 drives the box body 6 to move to the falling slow-descending position in the loading process of the box body 6, the multi-way valve 321 supplies oil to the first check valve 3221 through the first working oil port, the third overflow valve 3226 is opened when the oil pressure on the oil port side is controlled to reach a certain value, at the moment, hydraulic oil flowing through the first check valve 3221 flows to the rod cavity 21, hydraulic oil in the rodless cavity 22 flows back to the second working oil port through the third overflow valve 3226, and recovery of the piston rod 24 is achieved; wherein the flow rate of the hydraulic oil supplied to the rod chamber 21 is reduced by the multi-way valve 321 to realize the slow descent when the tank 6 is loaded. When the position detection structure 4 detects that the box body 6 is driven by the boom hook body 1 to move to the floor slow-descending position in the unloading process of the box body 6, the multi-way valve 321 supplies oil to the second check valve 3222 through the second working oil port, the second overflow valve 3225 is opened when the oil pressure on the oil port side is controlled to reach a certain value, at this time, hydraulic oil flowing through the second check valve 3222 flows to the rodless cavity 22, and hydraulic oil in the rod cavity 21 flows back to the first working oil port through the second overflow valve 3225, so that the piston rod 24 extends out; wherein the flow rate of the hydraulic oil supplied to the rodless chamber 22 is reduced by the multi-way valve 321 to realize the slow descent when the tank 6 is unloaded.

In this way, by providing the bidirectional balance valve 322, the stability of oil supply and oil return of the hydraulic cylinder 2 is ensured, and when one of the rod chamber 21 and the rodless chamber 22 supplies oil, the other one can return oil smoothly, so that the smooth extension and retraction of the hydraulic cylinder 2 is ensured.

Optionally, as shown in fig. 4, the bidirectional balancing valve 322 further includes a third check valve 3223, a fourth check valve 3224, and a second solenoid valve 3227, an oil outlet of the second overflow valve 3225 is connected to an oil inlet of the first check valve 3221 through the second solenoid valve 3227 and the fourth check valve 3224, an oil outlet of the second overflow valve 3225 is communicated with an oil inlet of the second solenoid valve 3227, an oil outlet of the second solenoid valve 3227 is communicated with an oil inlet of the fourth check valve 3224, and an oil outlet of the fourth check valve 3224 is communicated with an oil inlet of the first check valve 3221; an oil inlet of the third check valve 3223 is communicated with an oil outlet of the second overflow valve 3225, and an oil outlet of the third check valve 3223 is communicated with an oil outlet of the second check valve 3222.

In this embodiment, when the position detecting structure 4 detects that the boom hook body 1 drives the box 6 to move to the car-falling slow-descending position in the loading process of the box 6, the multi-way valve 321 supplies oil to the first check valve 3221 through the first working oil port, the third overflow valve 3226 is opened when the oil pressure on the oil port side is controlled to reach a certain value, at this time, hydraulic oil flowing through the first check valve 3221 flows to the rod chamber 21, and hydraulic oil in the rod-free chamber 22 flows back to the second working oil port through the third overflow valve 3226, so as to recover the piston rod 24; the flow rate of the hydraulic oil supplied to the rod chamber 21 is reduced by the multi-way valve 321, and slow lowering is realized when the tank 6 is loaded. When the position detection structure 4 detects that the boom hook body 1 drives the box body 6 to move to the landing slow-descending position in the unloading process of the box body 6, the multi-way valve 321 supplies oil to the second check valve 3222 through the second working oil port, the second electromagnetic valve 3227 is opened, the second overflow valve 3225 is opened when the oil pressure on the oil port side is controlled to reach a certain value, at the moment, hydraulic oil flowing through the second check valve 3222 flows to the rodless cavity 22, and hydraulic oil in the rod cavity 21 flows back to the first working oil port through the second overflow valve 3225, the second electromagnetic valve 3227 and the fourth check valve 3224, so that the piston rod 24 extends out; wherein, the flow rate of the hydraulic oil supplied to the rodless chamber 22 is reduced by the multi-way valve 321 to realize slow descent when the tank 6 is unloaded.

During the unloading process of the tank 6, before the tank 6 leaves the vehicle frame (or leaves the horizontal position of the vehicle frame) to reach the landing slow-lowering position, the second electromagnetic valve 3227 is closed, the multi-way valve 321 supplies oil to the second check valve 3222 through the second working oil port, the second overflow valve 3225 is opened when the oil pressure on the oil port side is controlled to reach a certain value, at this time, the hydraulic oil flowing through the second check valve 3222 flows to the rodless cavity 22, and the hydraulic oil in the rod cavity 21 also flows to the rodless cavity 22 through the second overflow valve 3225 and the third check valve 3223, so as to increase the flow rate of the hydraulic oil supplied to the rodless cavity 22 and increase the extension rate of the piston rod 24, thereby increasing the unloading rate during the unloading process of the tank 6, realizing rapid tank unloading, and saving tank unloading time. In some embodiments, during the unloading of the container 6, the second solenoid valve 3227 is closed after the front end of the container 6 leaves the frame (or leaves the horizontal position of the frame) for a certain vertical distance until the container 6 reaches the landing position, so as to avoid the occurrence of a situation that the container 6 is accelerated to unload the container 6 when the front end of the container 6 just leaves the frame or the underframe girder 13, which may cause a large impact to the container 6. The flow of the hydraulic oil supplied to the rodless cavity 22 is increased by the bidirectional balance valve 322, and there is no need to put higher requirements on the structures of the multi-way valve 321 and the oil pump 31, for example, the oil pump 31 can realize low-cost quick box unloading of the boom hook mechanism by using a fixed displacement pump having the advantages of low cost, convenient maintenance and the like.

Optionally, a control oil port of second overflow valve 3225 is communicated with an oil inlet or an oil outlet of second check valve 3222 through a fourth oil path 3228, and fourth oil path 3228 is provided with a second throttle hole or a second throttle valve; a control oil port of the third overflow valve 3226 is communicated with an oil inlet or an oil outlet of the first check valve 3221 through a fifth oil path 3229, and the fifth oil path 3229 is provided with a third throttling hole or a third throttling valve.

In this embodiment, a second throttle or a second throttle is disposed in fourth oil path 3228, so as to ensure that the second relief valve 3225 is opened only when the hydraulic oil pressure at the control oil port side reaches a certain value, thereby preventing sudden opening or closing of second relief valve 3225, and ensuring the stability of hydraulic oil flowing in the oil path where second relief valve 3225 is located. Similarly, by providing a third orifice or a third throttle valve in fifth oil path 3229, it is ensured that the hydraulic oil pressure on the control port side of third overflow valve 3226 is opened only when reaching a certain value, so as to prevent third overflow valve 3226 from being suddenly opened or closed, and ensure the stability of the flow of the hydraulic oil in the oil path where third overflow valve 3226 is located. Thus, the stability of the hydraulic cylinder 2 during operation is improved.

Another embodiment of the utility model provides a hook arm car, include the single arm-drag hook mechanism as above.

In this embodiment, the hook arm vehicle is a self-loading and unloading vehicle for transporting the box body 6, which is provided with the pull arm hook mechanism. The hook arm vehicle is provided with a pull arm hook mechanism to drive a piston rod 24 of the hydraulic cylinder 2 to move correspondingly through the hydraulic flow adjusting structure 3, so that the corresponding movement of the pull arm hook body 1 is realized. The hydraulic flow control structure 3 slowly falls when supplying to the hydraulic oil flow that has pole chamber 21 when reducing box 6 and loading in order to realize that box 6 loads, slowly falls when supplying to rodless chamber 22 when unloading through reducing box 6, can play certain guard action to the article that load in box and the box, the article that load in box 6 and the box caused the damage to the article that load in box 6 and the box 6 of producing great impact in the box 6 handling process has effectively been avoided promptly, make the hook arm car that possesses hydraulic flow control structure 3 and arm-pulling hook mechanism be suitable for the transportation loading to have medical equipment, the box 6 of special equipment such as fire-fighting equipment, in order to guarantee medical equipment, the transportation safety of special equipment such as fire-fighting equipment. Moreover, the hydraulic flow regulating structure 3 can also increase the flow of hydraulic oil supplied to the rodless chamber 22 to increase the unloading rate of the tank 6 during unloading when the tank 6 is in the unloading process and is not moved to the landing slow-descent position (i.e., before the tank 6 reaches the landing slow-descent position during unloading).

Although the present disclosure has been described above, the scope of the present disclosure is not limited thereto. Various changes and modifications may be made by those skilled in the art without departing from the spirit and scope of the present disclosure, and these changes and modifications are intended to fall within the scope of the present disclosure.

Claims (9)

1. A draw arm hook mechanism is characterized by comprising a draw arm hook body (1), a hydraulic cylinder (2) and a hydraulic flow regulation structure (3), wherein the hydraulic cylinder (2) is arranged on the draw arm hook body (1) and is suitable for driving the draw arm hook body (1), and a rod cavity (21) and a rodless cavity (22) of the hydraulic cylinder (2) are both connected with the hydraulic flow regulation structure (3); the single-arm-pull hook comprises a hook arm (11), a connecting arm (12) and an underframe girder (13), wherein the hook arm (11) is connected with the connecting arm (12) in a sliding mode and/or in a rotating mode, the connecting arm (12) is connected with the underframe girder (13) in a rotating mode, and a cylinder body (23) and a piston rod (24) of a hydraulic cylinder (2) are respectively connected with the underframe girder (13) and the connecting arm (12) in a rotating mode.

2. A draw arm hook mechanism according to claim 1, wherein the hydraulic flow regulating structure (3) comprises an oil pump (31) and a valve block (32), the oil pump (31) supplying oil to the rod chamber (21) or the rodless chamber (22) through the valve block (32), the valve block (32) being adapted to regulate the flow of hydraulic oil supplied to the rod chamber (21) or the rodless chamber (22).

3. The draw arm hook mechanism according to claim 2, wherein the valve block (32) comprises a multi-way valve (321) and a bidirectional balancing valve (322), the multi-way valve (321) being adapted to supply hydraulic oil supplied from the oil pump (31) to the rod chamber (21) or the rodless chamber (22) through the bidirectional balancing valve (322); and the multi-way valve (321) is used for adjusting the flow of the hydraulic oil supplied to the rod cavity (21) or the rodless cavity (22).

4. The draw arm hook mechanism according to claim 3, wherein the multiple way valve (321) comprises a selector valve (3211), a first oil path (3212), a second oil path (3213), and a third oil path (3214), the first oil path (3212) is provided with a first solenoid valve (3212 a), the second oil path (3213) is provided with a first orifice or a first throttle valve, and the third oil path (3214) is provided with a first relief valve (3214 a); one end of each of the first oil path (3212), the second oil path (3213) and the third oil path (3214) is communicated with an oil outlet of the oil pump (31), the other end of each of the first oil path (3212) and the second oil path (3213) is communicated with an oil inlet of the reversing valve (3211), and the other end of the third oil path (3214) and an oil return port of the reversing valve (3211) are communicated with an oil tank (5); a first working oil port of the reversing valve (3211) is communicated with one of the rod chamber (21) or the rodless chamber (22) through the bidirectional balance valve (322), and a second working oil port of the reversing valve (3211) is communicated with the other of the rod chamber (21) or the rodless chamber (22) through the bidirectional balance valve (322).

5. The boom hook mechanism according to claim 4, wherein the two-way balance valve (322) comprises a first check valve (3221), a second check valve (3222), a second overflow valve (3225) and a third overflow valve (3226), an oil inlet of the first check valve (3221) and an oil outlet of the second overflow valve (3225) are both communicated with the first working oil port, and an oil inlet of the second check valve (3222) and an oil outlet of the third overflow valve (3226) are both communicated with the second working oil port; an oil outlet of the first check valve (3221) and an oil inlet of the second overflow valve (3225) are both communicated with the rod cavity (21), and an oil outlet of the second check valve (3222) and an oil inlet of the third overflow valve (3226) are both communicated with the rodless cavity (22); a control oil port of the second overflow valve (3225) is communicated with an oil inlet or an oil outlet of the second check valve (3222), and a control oil port of the third overflow valve (3226) is communicated with an oil inlet or an oil outlet of the first check valve (3221).

6. The boom hook mechanism according to claim 5, wherein the bidirectional balance valve (322) further comprises a third check valve (3223), a fourth check valve (3224) and a second solenoid valve (3227), an oil outlet of the second overflow valve (3225) is connected with an oil inlet of the first check valve (3221) through the second solenoid valve (3227) and the fourth check valve (3224), an oil outlet of the second overflow valve (3225) is communicated with an oil inlet of the second solenoid valve (3227), an oil outlet of the second solenoid valve (3227) is communicated with an oil inlet of the fourth check valve (3224), and an oil outlet of the fourth check valve (3224) is communicated with an oil inlet of the first check valve (3221); an oil inlet of the third check valve (3223) is communicated with an oil outlet of the second overflow valve (3225), and an oil outlet of the third check valve (3223) is communicated with an oil outlet of the second check valve (3222).

7. The draw arm hook mechanism according to claim 5 or 6, wherein the control oil port of the second overflow valve (3225) is communicated with the oil inlet of the second check valve (3222) through a fourth oil path (3228), and the fourth oil path (3228) is provided with a second throttle hole or a second throttle valve; the control oil port of the third overflow valve (3226) is communicated with the oil inlet of the first check valve (3221) through a fifth oil path (3229), and the fifth oil path (3229) is provided with a third throttling hole or a third throttling valve.

8. A draw arm hook mechanism according to claim 2, further comprising a position detecting structure (4), said position detecting structure (4) being provided on said draw arm hook body (1) and/or said hydraulic cylinder (2) and being adapted to detect the position of a box (6) of a hook arm car; when the position detection structure (4) detects that the box body (6) moves to a vehicle falling slow-descending position in the loading process, the valve group (32) reduces the flow of hydraulic oil supplied to the rod cavity (21); when the position detection structure (4) detects that the box body (6) moves to a landing slow-descending position in the unloading process, the valve group (32) reduces the flow of hydraulic oil supplied to the rodless cavity (22); when the position detection structure (4) detects that the box body (6) does not move to the landing slow-descending position in the unloading process, the valve group (32) lifts the flow of hydraulic oil supplied to the rodless cavity (22).

9. A hook arm vehicle, characterized in that it comprises a pull arm hook mechanism according to any one of claims 1-8.

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