A boom cylinder sequential extension and retraction control device

Abstract

A boom cylinder sequential telescopic control device. It relates to engineering machinery hydraulic control technology, and in particular to a boom cylinder sequential telescopic control device. It provides a boom cylinder sequential telescopic control device with low pressure loss, compact structure, convenient maintenance, easy implementation, good versatility and high reliability. It includes a first cylinder, a second cylinder, a logic valve G, a logic valve I and a motorized reversing valve K; the tail of the cylinder body of the second cylinder is provided with a block J adapted to the motorized reversing valve K, and the motorized reversing valve K is switched from a disconnected state to a conductive state through the block J, so that the logic valve I is opened, triggering the rodless chamber of the first cylinder to return oil, and the piston rod of the first cylinder is retracted. The present invention has the characteristics of compact structure, small system pressure loss, convenient maintenance, and reliable operation.

Description

Technical Field

[0001] The invention relates to hydraulic control technology for engineering machinery, and in particular to a boom oil cylinder sequential telescopic control device. Background Art

[0002] The boom extension and retraction of a straight-arm truck-mounted crane is a technology that uses a hydraulic cylinder to drive several sets of ropes to drive the synchronous extension and retraction of each section of the boom. This technology has been gradually eliminated due to safety issues such as excessive load on a single rope and easy breakage of the wire rope. At present, the technology of using double or multiple cylinders to complete the synchronous extension and retraction of the boom has become a development trend.

[0003] Due to the limitation of the external dimensions of the straight boom truck crane, the telescopic cylinder is usually arranged inside the boom. However, the cross-section of the boom of the straight boom truck crane is relatively small. In order to match the lifting capacity of each telescopic arm after extension and retraction with the lifting characteristics of the crane, the movement of each cylinder in the boom is required to be extended and retracted sequentially.

[0004] With regard to the existing boom cylinder sequential telescopic control technology, some sequential telescopic controls are implemented by using sequential valves, and the pressure loss of the system is relatively large, and the efficiency is relatively low; some sequential telescopic controls are triggered by special stroke valves on the cylinder, and their structures are complex, and their reliability and maintainability are poor; some sequential telescopic controls are implemented by electronic control, and because they involve electronic control, they are very inconvenient to use and have a high failure rate. Summary of the invention

[0005] In view of the above problems, the present invention provides a boom oil cylinder sequential extension and retraction control device with low pressure loss, compact structure, convenient maintenance, easy implementation, good versatility and high reliability.

[0006] The technical solution of the present invention is: comprising a first oil cylinder, a second oil cylinder, a logic valve G, a logic valve I and a motorized reversing valve K;

[0007] The piston rod of the first oil cylinder is provided with an oil passage A and an oil passage B;

[0008] The piston rod of the second oil cylinder is provided with an oil passage P and an oil passage M;

[0009] The oil passage A extends from the oil port 11 on the outer end surface of the piston rod of the first oil cylinder toward the piston and is connected to the rod chamber of the first oil cylinder;

[0010] The oil passage P extends from the oil port 17 on the outer end surface of the piston rod of the second oil cylinder toward the piston and communicates with the rod chamber of the second oil cylinder;

[0011] The first oil cylinder is provided with an oil port 13 connected to the rod chamber of the first oil cylinder;

[0012] The oil port 17 is connected to the oil port 13;

[0013] The oil passage B extends from the oil port 10 on the outer end face of the piston rod of the first oil cylinder toward the piston, and communicates with the oil port 1 of the logic valve G and the oil port 7 of the logic valve I through the oil port 14 of the first oil cylinder respectively;

[0014] The oil passage B extends from the oil port 10 on the outer end face of the piston rod of the first oil cylinder toward the piston, passes through the rodless cavity, and communicates with the oil port 1 of the logic valve G and the oil port 7 of the logic valve I through the oil port 14 of the first oil cylinder respectively;

[0015] The oil port 2 of the logic valve G is connected to the oil port 16 on the end surface of the piston rod of the second oil cylinder;

[0016] The oil passage M extends from the oil port 16 toward the piston of the second oil cylinder and is connected to the rodless chamber of the second oil cylinder;

[0017] The control oil port 3 of the spring chamber of the logic valve G is connected to the signal oil port 12 of the first oil cylinder;

[0018] The oil port 12 is located at the end of the extension stroke of the piston rod of the first oil cylinder, and is connected to the cylinder of the first oil cylinder and is close to the rodless cavity side of the piston;

[0019] The oil port 4 of the logic valve G is connected to the oil port 14 of the first oil cylinder;

[0020] The control port 9 of the spring chamber of the logic valve I is connected to the oil port 6 of the motorized reversing valve K;

[0021] The oil port 5 of the motorized reversing valve K is connected to the oil port 14 of the first oil cylinder;

[0022] The tail of the cylinder body of the second oil cylinder is provided with a block J adapted to the motorized reversing valve K. The block J is used to switch the motorized reversing valve K from a disconnected state to a connected state, so that the logic valve I opens, triggering the oil return of the rodless chamber of the first oil cylinder, and the piston rod of the first oil cylinder retracts.

[0023] The model of the logic valve G is DPS2-16-FF-AA.

[0024] The model of the logic valve I is DPS2-16-SF-AA.

[0025] The model of the motorized reversing valve K is CE06-DG3 / 8-20 / 315.

[0026] The present invention includes a first oil cylinder, a second oil cylinder, a logic valve G, a logic valve I and a motorized reversing valve K, and the above three valves are integrated and installed at the tail of the oil cylinder; the built-in oil passage A of the piston rod of the first oil cylinder is connected with its rod cavity, and is connected with the rod cavity of the second oil cylinder through the oil port 13 of the first oil cylinder, the oil port 17 of the second oil cylinder and the built-in oil passage P of the piston rod of the second oil cylinder; the built-in oil passage B of the piston rod of the first oil cylinder passes through the rodless cavity of the first oil cylinder, and is connected with the oil port 1 of the logic valve G and the oil port 7 of the logic valve I respectively through the oil port 14 of the first oil cylinder, and the oil port 2 of the logic valve G is connected with the piston rod of the second oil cylinder. The upper oil port 16 is connected, and through the built-in oil passage M of the piston rod, it is connected to the rodless chamber of the second oil cylinder; the spring chamber control oil port 3 of the logic valve G is connected to the pressure receiving oil port 12 of the piston rod of the first oil cylinder at the end of the stroke, which is adjacent to the rodless chamber side of the piston, and the receiving oil port 12 is connected to the inside of the first oil cylinder through a small hole on the cylinder body of the first oil cylinder; the oil port 4 of the logic valve G is connected to the oil port 14 of the first oil cylinder through a pipeline; the spring chamber control port 9 of the logic valve I is connected to the oil port 6 of the motorized reversing valve K, and another oil port 5 of the motorized reversing valve K is also connected to the straight pipeline of the oil port 14 of the first oil cylinder. The present invention has the characteristics of compact structure, small system pressure loss, convenient maintenance, and reliable operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is the hydraulic principle diagram of the present invention,

[0028] Figure 2 This is a schematic diagram of the structure of the first oil cylinder and the second oil cylinder.

[0029] Figure 3 yes Figure 2 A-direction structural diagram of the oil port 12 in the middle,

[0030] Figure 4 yes Figure 2 The B-direction structural diagram of the local integrated block at the tail of the first oil cylinder.

[0031] Figure 5 This is a schematic diagram of the position of the first oil cylinder extending into position and the oil port outputting the high-pressure oil control signal;

[0032] In the figure, Ⅰ is oil channel A, Ⅱ is oil channel B, Ⅱ-1 is pipe body 1, Ⅱ-2 is pipe body 2, Ⅲ is the first oil cylinder, Ⅲ-1 is the oil port 12, Ⅳ is the logic valve G, Ⅴ is the logic valve I, Ⅵ is the motorized reversing valve K, and Z is the integrated block.

[0033] Ⅶ is the second oil cylinder, VIII is the block J, Ⅸ is the oil passage M, and X is the oil passage P. DETAILED DESCRIPTION

[0034] The present invention Figure 1-5As shown, it includes a first oil cylinder III, a second oil cylinder VII, a logic valve GIV, a logic valve IV and a motorized reversing valve KVI;

[0035] The piston rod of the first oil cylinder III is provided with an oil passage AⅠ and an oil passage BⅡ;

[0036] The piston rod of the second oil cylinder Ⅶ is provided with an oil passage PB and an oil passage MIX;

[0037] The oil passage AⅠ extends from the oil port 11 on the outer end surface of the piston rod of the first oil cylinder III toward the piston of the first oil cylinder III and communicates with the rod chamber of the first oil cylinder III;

[0038] The oil passage PI extends from the oil port 17 on the outer end surface of the piston rod of the second oil cylinder VII toward the piston of the second oil cylinder VII and communicates with the rod chamber of the second oil cylinder VII;

[0039] The first oil cylinder III is provided with an oil port 13 connected to the rod chamber of the first oil cylinder III;

[0040] The oil port 17 is connected to the oil port 13 through a pipeline;

[0041] The oil passage BⅡ extends from the oil port 10 on the outer end face of the piston rod of the first oil cylinder Ⅲ toward the piston of the first oil cylinder Ⅲ, passes through the rodless chamber of the first oil cylinder Ⅲ, and is connected to the oil port 1 of the logic valve GⅣ and the oil port 7 of the logic valve IⅤ through the oil port 14 of the first oil cylinder Ⅲ respectively; Figure 2 and Figure 5 As shown, the oil channel BⅡ includes a tube body 1Ⅱ-1 and a tube body 2Ⅱ-2 adapted to be connected in the tube body 1Ⅱ-1; the tube body 1Ⅱ-1 is fixedly arranged in the piston rod of the first oil cylinder III, and the tube body 2Ⅱ-2 is fixedly arranged in the cylinder body of the first oil cylinder III, one end of which extends into the inner cavity of the tube body 1Ⅱ-1 and is connected to the tube body 1Ⅱ-1 through a sealing member, and the other end is fixedly arranged at the tail of the cylinder body of the first oil cylinder III and is connected to the oil port 14.

[0042] like Figure 5 As shown in the figure, in the piston rod area on the left side, the middle position is the tube body Ⅱ-1, and between the inner wall of the piston rod of the first oil cylinder Ⅲ and the tube body Ⅱ-1 is the oil channel A, and the oil channel A has a ring structure.

[0043] The oil port 2 of the logic valve GIV is connected to the oil port 16 on the end surface of the piston rod of the second oil cylinder VII;

[0044] The oil passage MIX extends from the oil port 16 toward the piston direction of the second oil cylinder VII and directly passes through the rodless chamber of the second oil cylinder VII.

[0045] The control oil port 3 of the spring chamber of the logic valve GⅣ is connected to the signal oil port 12Ⅲ-1 of the first oil cylinder III;

[0046] The oil port 12Ⅲ-1 is located at the end of the piston rod extension stroke of the first oil cylinder Ⅲ, close to the rodless cavity side of the piston; and is connected to the rodless cavity in the first oil cylinder Ⅲ;

[0047] The oil port 4 of the logic valve GIV is connected to the oil port 14 of the first oil cylinder III;

[0048] The control port 9 of the spring chamber of the logic valve IⅤ is connected to the oil port 6 of the motorized reversing valve KⅥ;

[0049] The oil port 5 of the motorized reversing valve KVI is connected to the oil port 14 of the first oil cylinder III;

[0050] The tail of the cylinder body of the second oil cylinder Ⅶ is provided with a block JⅧ adapted to the motorized reversing valve KⅥ. The block JⅧ is used to realize the motorized reversing valve KⅥ to switch from a disconnected state to a conductive state, so that the logic valve IⅤ opens, triggering the rodless chamber of the first oil cylinder III to return oil, and the piston rod of the first oil cylinder III retracts.

[0051] The model of the logic valve GⅣ is: DPS2-16-FF-AA.

[0052] The model of the logic valve II is: DPS2-16-SF-AA.

[0053] The model of the motorized reversing valve KVI is: CE06-DG3 / 8.

[0054] Preferably, the logic valve GⅣ, the logic valve IⅤ and the motorized reversing valve KⅥ in this case are all in the form of threaded cartridge valves, and the above three threaded cartridge valves are integrated into one and installed as a whole at the tail of the cylinder in the form of an integrated block Z.

[0055] like Figure 1As shown, the piston rod built-in oil passage AⅠ of the first oil cylinder III is connected with its rod cavity, and is connected to the rod cavity of the second oil cylinder VII through the oil port 13 of the first oil cylinder III, the oil port 17 of the second oil cylinder VII and the piston rod built-in oil passage PⅩ of the second oil cylinder VII; the piston rod built-in oil passage BⅡ of the first oil cylinder III passes through the rodless cavity of the first oil cylinder III, and is connected to the oil port 1 of the logic valve GⅣ and the oil port 7 of the logic valve IⅤ respectively through the oil port 14 of the first oil cylinder III, the oil port 2 of the logic valve GⅣ is connected with the upper oil port 16 of the piston rod of the second oil cylinder VII, and is connected to the second oil rod through the piston rod built-in oil passage MⅨ. The rodless chamber of cylinder Ⅶ; the spring chamber control oil port 3 of the logic valve GⅣ is connected to the pressure-taking oil port 12Ⅲ-1 of the piston rod of the first cylinder III at the end of the extended stroke and close to the rodless chamber side of its piston, and the taking oil port 12Ⅲ-1 is connected to the rodless chamber inside the first cylinder III through a small hole on the cylinder body of the first cylinder III; the oil port 4 of the logic valve GⅣ is connected to the oil port 14 of the first cylinder III through a pipeline; the spring chamber control port 9 of the logic valve IⅤ is connected to the oil port 6 of the motorized reversing valve KⅥ, and the other oil port 5 of the motorized reversing valve KⅥ is also connected to the straight pipeline of the oil port 14 of the first cylinder III.

[0056] See attached Figure 2~Figure 5 In this case, pressure difference reversing is used to control the sequential extension of the cylinders, and motorized reversing is used to control the sequential retraction of the cylinders.

[0057] In order to extend the second cylinder VII after the first cylinder III is extended, a receiving oil port 12Ⅲ-1 (such as Figure 2 As shown), and connected to the spring control oil port 3 of the logic valve GⅣ (normally open logic valve GⅣ) through the oil port 12Ⅲ-1, through the pressure difference between the control oil port 4 of the logic valve GⅣ and the spring chamber oil port 3, to realize whether the logic valve GⅣ provides high-pressure hydraulic oil to the rodless chamber of the second oil cylinder Ⅶ and performs the extension action of the second oil cylinder Ⅶ;

[0058] In order to realize the retraction of the first cylinder III only after the second cylinder VII has retracted, a motorized reversing valve KVI is installed on the integrated block Z installed at the tail of the first cylinder III, and a block JVIII is installed at the appropriate position of the second cylinder VII. When the second cylinder VII retracts to its full stroke retracted position, the block JVIII on the second cylinder VII can just trigger the motorized reversing valve KVI on the integrated block Z at the tail of the first cylinder III. The motorized reversing valve KVI changes from the disconnected state to the conducting state, so that the normally closed logic valve II opens, realizing the oil return to the rodless chamber of the first cylinder III and the retraction of the piston rod.

Claims

1. A boom cylinder sequential telescopic control device, characterized in that: It includes a first oil cylinder, a second oil cylinder, a logic valve G, a logic valve I and a motorized reversing valve K; The piston rod of the first oil cylinder is provided with an oil passage A and an oil passage B; The piston rod of the second oil cylinder is provided with an oil passage P and an oil passage M; The oil passage A extends from the oil port 11 on the outer end surface of the piston rod of the first oil cylinder toward the piston and is connected to the rod chamber of the first oil cylinder; The oil passage P extends from the oil port 17 on the outer end surface of the piston rod of the second oil cylinder toward the piston and communicates with the rod chamber of the second oil cylinder; The first oil cylinder is provided with an oil port 13 connected to the rod chamber of the first oil cylinder; The oil port 17 is connected to the oil port 13; The oil passage B extends from the oil port 10 on the outer end face of the piston rod of the first oil cylinder toward the piston, and communicates with the oil port 1 of the logic valve G and the oil port 7 of the logic valve I through the oil port 14 of the first oil cylinder respectively; The oil port 2 of the logic valve G is connected to the oil port 16 on the end surface of the piston rod of the second oil cylinder; The oil passage M extends from the oil port 16 toward the piston of the second oil cylinder and is connected to the rodless chamber of the second oil cylinder; The control oil port 3 of the spring chamber of the logic valve G is connected to the signal oil port 12 of the first oil cylinder; The oil port 12 is located at the end of the extension stroke of the piston rod of the first oil cylinder, close to the rodless cavity side of the piston, and connected to the rodless cavity in the cylinder of the first oil cylinder; The oil port 4 of the logic valve G is connected to the oil port 14 of the first oil cylinder; The control port 9 of the spring chamber of the logic valve I is connected to the oil port 6 of the motorized reversing valve K; The oil port 5 of the motorized reversing valve K is connected to the oil port 14 of the first oil cylinder; The tail of the cylinder body of the second oil cylinder is provided with a block J adapted to the motorized reversing valve K. The block J is used to switch the motorized reversing valve K from a disconnected state to a connected state, so that the logic valve I opens, triggering the oil return of the rodless chamber of the first oil cylinder, and the piston rod of the first oil cylinder retracts.

2. The boom cylinder sequential telescopic control device according to claim 1, characterized in that: The model of the logic valve G is DPS2-16-FF-AA.

3. The boom cylinder sequential telescopic control device according to claim 1, characterized in that: The model of the logic valve I is DPS2-16-SF-AA.

4. The boom cylinder sequential extension and retraction control device according to claim 1, characterized in that: The model of the motorized reversing valve K is CE06-DG3 / 8.

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