Hydraulic control system of sawing hydraulic cylinder of cold saw

Abstract

The invention provides a hydraulic control system for a saw feeding hydraulic cylinder of a cold saw, which comprises a first electromagnetic directional valve, a second electromagnetic directional valve, a hydraulic control system and a control system, the first working oil outlet of the first electromagnetic directional valve is communicated with a rod cavity of the hydraulic cylinder, and the second working oil outlet of the first electromagnetic directional valve is communicated with a rodless cavity of the hydraulic cylinder; a first working oil outlet of the proportional reversing valve is communicated with a rod cavity of the hydraulic cylinder through a hydraulic control one-way valve, and a second working oil outlet of the proportional reversing valve is communicated with a rodless cavity of the hydraulic cylinder through the hydraulic control one-way valve; and a working oil outlet of the second electromagnetic directional valve is communicated with a control port of the hydraulic control one-way valve. The cold saw has the beneficial effects that when the forward process of the saw cutting hydraulic cylinder is no-load, the proportional reversing valve and the first electromagnetic reversing valve work at the same time, when a cold saw is fed and makes contact with a workpiece for saw cutting, only the proportional valve inputs a corresponding signal to act, the working efficiency is improved, and the second electromagnetic reversing valve controls the hydraulic control one-way valve to be opened; the influence of the cylinder pressure of the hydraulic cylinder is avoided.

Description

Technical Field

[0001] The invention belongs to the technical field of steel production equipment, and in particular relates to a hydraulic control system of a cold saw feed hydraulic cylinder. Background Art

[0002] Cold sawing machine is a commonly used mechanical equipment in the steel production process. The current hydraulic control system of the saw feed hydraulic cylinder has the following problems during use: First, it is controlled by a proportional reversing valve, and the movement speed is slow during no-load or back-sawing, resulting in low work efficiency; second, there is a lack of back pressure during the sawing process, which causes the saw feed hydraulic cylinder to have an unstable speed during sawing, which can easily damage the saw blade; third, a superimposed hydraulic-controlled one-way valve is set at the oil outlet of the proportional reversing valve, and the change in the hydraulic cylinder load affects the opening of the superimposed hydraulic-controlled one-way valve. Summary of the invention

[0003] In view of this, the present invention aims to propose a hydraulic control system for a cold saw feed hydraulic cylinder, in order to solve at least one of the above-mentioned technical problems.

[0004] To achieve the above object, the technical solution of the present invention is achieved as follows:

[0005] A hydraulic control system for a cold saw feed hydraulic cylinder, comprising:

[0006] A first electromagnetic reversing valve, wherein a first working oil outlet of the first electromagnetic reversing valve is communicated with a rod chamber of the hydraulic cylinder, and a second working oil outlet of the first electromagnetic reversing valve is communicated with a rodless chamber of the hydraulic cylinder;

[0007] A proportional reversing valve, wherein a first working oil outlet of the proportional reversing valve is connected to a rod chamber of a hydraulic cylinder through a hydraulically controlled one-way valve, and a second working oil outlet of the proportional reversing valve is connected to a rodless chamber of the hydraulic cylinder through a hydraulically controlled one-way valve;

[0008] A second electromagnetic reversing valve, wherein a working oil outlet of the second electromagnetic reversing valve is connected to a control port of the hydraulically controlled one-way valve.

[0009] Furthermore, the first working oil outlet of the first electromagnetic reversing valve is connected to the rod chamber of the hydraulic cylinder through the first channel of the superimposed hydraulic control one-way valve.

[0010] The second working oil outlet of the first electromagnetic reversing valve is communicated with the rodless chamber of the hydraulic cylinder through the second channel of the superimposed hydraulic control one-way valve.

[0011] Furthermore, the control port of the first channel of the superimposed hydraulically controlled one-way valve is communicated with the second working oil outlet of the first electromagnetic reversing valve;

[0012] The control port of the second channel of the superimposed hydraulically controlled one-way valve is communicated with the first working oil outlet of the first electromagnetic reversing valve.

[0013] Furthermore, the rod chamber of the hydraulic cylinder is connected to two first connecting pipes through a first main pipe, one first connecting pipe is connected to a first working oil outlet of a proportional reversing valve through a hydraulically controlled one-way valve, and the other first connecting pipe is connected to a first working oil outlet of a first electromagnetic reversing valve;

[0014] A sequence valve is arranged on the first main pipe.

[0015] Further, the sequence valve is connected to the rod chamber of the hydraulic cylinder through the first ball valve;

[0016] A pressure gauge is provided between the first ball valve and the sequence valve.

[0017] Further, the rodless chamber of the hydraulic cylinder is connected to two second connecting pipes through a second main pipe, one second connecting pipe is connected to a second working oil outlet of the proportional reversing valve through a hydraulically controlled one-way valve, and the other second connecting pipe is connected to a second working oil outlet of the first electromagnetic reversing valve;

[0018] The second main pipe is provided with a second ball valve and a pressure gauge, and the second ball valve is located between the pressure gauge and the rodless chamber of the hydraulic cylinder.

[0019] Furthermore, the pressure relief port of the hydraulically controlled one-way valve is connected to the pressure relief pipeline, and the oil return port of the second electromagnetic reversing valve is connected to the pressure relief pipeline;

[0020] The pressure relief pipeline is provided with a tubular one-way valve.

[0021] Furthermore, the oil supply pipeline is connected to the oil inlet of the first electromagnetic reversing valve;

[0022] The oil supply pipeline is communicated with the oil inlet of the second electromagnetic reversing valve;

[0023] The oil supply pipeline is connected with the oil inlet of the proportional reversing valve;

[0024] The oil supply pipe is provided with a third ball valve.

[0025] Furthermore, the oil return pipeline is connected to the oil return port of the first electromagnetic reversing valve;

[0026] The oil return pipeline is connected to the oil return port of the proportional reversing valve;

[0027] A check valve is arranged on the oil return pipeline.

[0028] Furthermore, the working oil outlet of the second electromagnetic reversing valve is connected to the control port of the hydraulically controlled one-way valve through a third connecting pipe;

[0029] The third connecting pipe is provided with a pressure gauge.

[0030] Compared with the prior art, the hydraulic control system of the cold saw feed hydraulic cylinder described in the present invention has the following beneficial effects:

[0031] The hydraulic control system of the cold saw hydraulic cylinder described in the present invention is that when the sawing hydraulic cylinder is unloaded during the forward process, the proportional reversing valve and the first electromagnetic reversing valve work simultaneously. When the cold saw contacts the workpiece for sawing, only the proportional valve inputs the corresponding signal to act, thereby improving the working efficiency. The second electromagnetic reversing valve controls the hydraulically controlled one-way valve to open, which is not affected by the cylinder pressure of the hydraulic cylinder. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0033] Figure 1 It is a schematic diagram of the structure of a hydraulic control system according to an embodiment of the present invention.

[0034] Description of reference numerals:

[0035] 101. First ball valve; 102. Second ball valve; 103. Third ball valve; 2. Pressure gauge; 3. Sequence valve; 4. Hydraulic-controlled non-return valve; 5. Proportional reversing valve; 601. First channel of superimposed hydraulic-controlled non-return valve; 602. Second channel of superimposed hydraulic-controlled non-return valve; 7. First solenoid reversing valve; 8. Second solenoid reversing valve; 9. Check valve; 10. Tubular non-return valve; 11. Oil supply pipeline; 12. Oil return pipeline; 13. Pressure relief pipeline; 14. First main pipe; 15. Second main pipe. DETAILED DESCRIPTION

[0036] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0037] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and the like are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", and the like may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0038] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0039] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0040] like Figure 1 As shown, a hydraulic control system of a cold saw hydraulic cylinder includes: a first electromagnetic reversing valve 7, a first working oil outlet of the first electromagnetic reversing valve 7 is connected to the rod chamber of the hydraulic cylinder, and a second working oil outlet of the first electromagnetic reversing valve 7 is connected to the rodless chamber of the hydraulic cylinder; a proportional reversing valve 5, a first working oil outlet of the proportional reversing valve 5 is connected to the rod chamber of the hydraulic cylinder through a hydraulically controlled one-way valve 4, and a second working oil outlet of the proportional reversing valve 5 is connected to the rodless chamber of the hydraulic cylinder through the hydraulically controlled one-way valve 4; a second electromagnetic reversing valve 8, a working oil outlet of the second electromagnetic reversing valve 8 is connected to the control port of the hydraulically controlled one-way valve 4.

[0041] The oil inlet of the hydraulically controlled one-way valve 4 is communicated with the hydraulic cylinder end, and the oil outlet of the hydraulically controlled one-way valve 4 is communicated with the proportional reversing valve 5 .

[0042] The first working oil outlet of the first electromagnetic reversing valve 7 is connected to the rod chamber of the hydraulic cylinder through the first channel 601 of the superimposed hydraulic control one-way valve, and the second working oil outlet of the first electromagnetic reversing valve 7 is connected to the rodless chamber of the hydraulic cylinder through the second channel 602 of the superimposed hydraulic control one-way valve.

[0043] The control port of the first channel 601 of the superimposed hydraulically controlled one-way valve is communicated with the second working oil outlet of the first electromagnetic reversing valve 7 ; the control port of the second channel 602 of the superimposed hydraulically controlled one-way valve is communicated with the first working oil outlet of the first electromagnetic reversing valve 7 .

[0044] The oil inlet of the superimposed hydraulically controlled one-way valve is connected to the hydraulic cylinder end, and the oil outlet of the superimposed hydraulically controlled one-way valve is connected to the first electromagnetic reversing valve 7;

[0045] The rod chamber of the hydraulic cylinder is connected to two first connecting pipes through the first main pipe 14, one first connecting pipe is connected to the first working oil outlet of the proportional reversing valve 5 through the hydraulically controlled one-way valve 4, and the other first connecting pipe is connected to the first working oil outlet of the first solenoid reversing valve 7; a sequence valve 3 is provided on the first main pipe 14.

[0046] The sequence valve 3 is connected to the rod chamber of the hydraulic cylinder through the first ball valve 101 ; a pressure gauge 2 is provided between the first ball valve 101 and the sequence valve 3 .

[0047] The rodless chamber of the hydraulic cylinder is connected to two second connecting pipes through the second main pipe 15, one second connecting pipe is connected to the second working oil outlet of the proportional reversing valve 5 through the hydraulically controlled one-way valve 4, and the other second connecting pipe is connected to the second working oil outlet of the first solenoid reversing valve 7; the second main pipe 15 is provided with a second ball valve 102 and a pressure gauge 2, and the second ball valve 102 is located between the pressure gauge 2 and the rodless chamber of the hydraulic cylinder.

[0048] The pressure relief port of the hydraulically controlled one-way valve 4 is connected to the pressure relief pipe 13, and the oil return port of the second electromagnetic reversing valve 8 is connected to the pressure relief pipe 13, to prevent the second electromagnetic reversing valve 8 from being unable to return oil normally when the oil pressure in the return oil pipe 12 is high, thereby ensuring the normal operation of the second electromagnetic reversing valve 8, and further ensuring the normal opening of the two hydraulically controlled one-way valves 4; a tubular one-way valve 10 is provided on the pressure relief pipe 13.

[0049] The oil supply pipeline 11 is connected to the oil inlet of the first electromagnetic reversing valve 7; the oil supply pipeline 11 is connected to the oil inlet of the second electromagnetic reversing valve 8; the oil supply pipeline 11 is connected to the oil inlet of the proportional reversing valve 5: a third ball valve 103 is provided on the oil supply pipe.

[0050] The oil return pipeline 12 is communicated with the oil return port of the first electromagnetic reversing valve 7 ; the oil return pipeline 12 is communicated with the oil return port of the proportional reversing valve 5 ; a check valve 9 is provided on the oil return pipeline 12 .

[0051] The working oil outlet of the second electromagnetic reversing valve 8 is connected to the control port of the hydraulically controlled one-way valve 4 through a third connecting pipe; a pressure gauge 2 is provided on the third connecting pipe.

[0052] The provision of the first ball valve 101, the second ball valve 102, and the third ball valve 103 facilitates the system shut-off and maintenance operations.

[0053] The setting of pressure gauge 2 is convenient for observing the pressure values ​​on different pipelines.

[0054] Working process:

[0055] When the sawing hydraulic cylinder does not touch the load during its forward movement, the proportional reversing valve 5 and the first solenoid reversing valve 7 work simultaneously, and the oil from the second oil outlets of the proportional reversing valve 5 and the first solenoid reversing valve 7 enters the rodless cavity of the hydraulic cylinder, and the output rod of the hydraulic cylinder extends rapidly. When the cold saw contacts the workpiece for sawing, only the proportional valve inputs the corresponding signal to act. When the sawing is completed and the sawing hydraulic cylinder retreats, the no-load situation is the same as the situation without contacting the load. The oil from the first oil outlets of the proportional reversing valve 5 and the first solenoid reversing valve 7 enters the rod cavity of the hydraulic cylinder, and the output rod of the hydraulic cylinder contracts rapidly. A sequence valve 3 is provided on a main pipe 14, so that there is a stable back pressure when the hydraulic cylinder output shaft extends, so that the sawing hydraulic cylinder is more stable when sawing. The hydraulically controlled one-way valve 4 at the working oil outlet of the proportional reversing valve 5 is a plate-type hydraulically controlled one-way valve 4. Compared with the superimposed hydraulic one-way valve, the control is more convenient. When the output shaft of the sawing hydraulic cylinder is extended or retracted, as long as the second solenoid reversing valve 8 is energized, the hydraulically controlled one-way valve 4 can be opened smoothly, and the oil can flow into the hydraulic cylinder smoothly without affecting the opening of the one-way valve due to changes in the hydraulic cylinder load, thereby avoiding jitter in the hydraulic cylinder control.

[0056] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention, and they should all be included in the scope of the claims and specification of the present invention.

[0057] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A hydraulic control system for a cold saw feed hydraulic cylinder, characterized in that: include: A first electromagnetic reversing valve (7), wherein a first working oil outlet of the first electromagnetic reversing valve (7) is communicated with a rod chamber of the hydraulic cylinder, and a second working oil outlet of the first electromagnetic reversing valve (7) is communicated with a rodless chamber of the hydraulic cylinder; A proportional reversing valve (5), wherein a first working oil outlet of the proportional reversing valve (5) is connected to a rod chamber of a hydraulic cylinder via a hydraulically controlled one-way valve (4), and a second working oil outlet of the proportional reversing valve (5) is connected to a rodless chamber of the hydraulic cylinder via a hydraulically controlled one-way valve (4); A second electromagnetic reversing valve (8), wherein a working oil outlet of the second electromagnetic reversing valve (8) is connected to a control port of the hydraulically controlled one-way valve (4).

2. The hydraulic control system of the cold saw feed hydraulic cylinder according to claim 1, characterized in that: The first working oil outlet of the first electromagnetic reversing valve (7) is connected to the rod chamber of the hydraulic cylinder through the first channel (601) of the superimposed hydraulic control one-way valve. The second working oil outlet of the first electromagnetic reversing valve (7) is connected to the rodless chamber of the hydraulic cylinder through the second channel (602) of the superimposed hydraulically controlled one-way valve.

3. The hydraulic control system of the cold saw feed hydraulic cylinder according to claim 2, characterized in that: The control port of the first channel (601) of the stacked hydraulically controlled one-way valve is in communication with the second working oil outlet of the first electromagnetic reversing valve (7); The control port of the second channel (602) of the superimposed hydraulically controlled one-way valve is in communication with the first working oil outlet of the first electromagnetic reversing valve (7).

4. The hydraulic control system of the cold saw feed hydraulic cylinder according to claim 1, characterized in that: The rod chamber of the hydraulic cylinder is connected to two first connecting pipes through a first main pipe (14), one first connecting pipe is connected to a first working oil outlet of a proportional reversing valve (5) through a hydraulically controlled one-way valve (4), and the other first connecting pipe is connected to a first working oil outlet of a first electromagnetic reversing valve (7); A sequence valve (3) is provided on the first main pipe (14).

5. The hydraulic control system of the cold saw feed hydraulic cylinder according to claim 4, characterized in that: The sequence valve (3) is connected to the rod chamber of the hydraulic cylinder through the first ball valve (101); A pressure gauge (2) is provided between the first ball valve (101) and the sequence valve (3).

6. The hydraulic control system of the cold saw feed hydraulic cylinder according to claim 1, characterized in that: The rodless chamber of the hydraulic cylinder is connected to two second connecting pipes through a second main pipe (15), one second connecting pipe is connected to a second working oil outlet of a proportional reversing valve (5) through a hydraulically controlled one-way valve (4), and the other second connecting pipe is connected to a second working oil outlet of a first electromagnetic reversing valve (7); The second main pipe (15) is provided with a second ball valve (102) and a pressure gauge (2), and the second ball valve (102) is located between the pressure gauge (2) and the rodless chamber of the hydraulic cylinder.

7. The hydraulic control system of the cold saw feed hydraulic cylinder according to claim 1, characterized in that: The pressure relief port of the hydraulically controlled one-way valve (4) is in communication with the pressure relief pipeline (13), and the oil return port of the second electromagnetic reversing valve (8) is in communication with the pressure relief pipeline (13); The pressure relief pipe (13) is provided with a tubular one-way valve (10).

8. The hydraulic control system of the cold saw feed hydraulic cylinder according to claim 1, characterized in that: The oil supply pipeline (11) is in communication with the oil inlet of the first electromagnetic reversing valve (7); The oil supply pipeline (11) is in communication with the oil inlet of the second electromagnetic reversing valve (8); The oil supply pipeline (11) is connected to the oil inlet of the proportional reversing valve (5); The oil supply pipe is provided with a third ball valve (103).

9. The hydraulic control system of the cold saw feed hydraulic cylinder according to claim 8, characterized in that: The oil return pipeline (12) is connected to the oil return port of the first electromagnetic reversing valve (7); The oil return pipeline (12) is connected to the oil return port of the proportional reversing valve (5); The oil return pipeline (12) is provided with a check valve (9).

10. The hydraulic control system of the cold saw feed hydraulic cylinder according to claim 1, characterized in that: The working oil outlet of the second electromagnetic reversing valve (8) is connected to the control port of the hydraulically controlled one-way valve (4) through a third connecting pipe; The third connecting pipe is provided with a pressure gauge (2).

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