CN211613831U - Control rotary valve for hydraulic single-return single-delivery of cold pilger mill - Google Patents

Abstract

The utility model discloses a control rotary valve for hydraulic single-return single-feed of a cold pilger mill, which mainly comprises a valve core 1 and a valve body 2, wherein the rotary valve is arranged along a horizontal position, and 7 threaded interfaces on the valve body 2 are positioned right above the rotary valve; the rotary motor 3, the rotary motor oil inlet one-way valve 4, the feeding motor 8 and the feeding motor oil inlet one-way valve 9 are arranged at the position of one side of the valve body 2; the rotary regulator 5, the regulator oil return one-way valve 6, the feeding regulator 7 and the hydraulic system unloading one-way valve 11 are arranged at the other side of the valve body 2; the pipelines of the hydraulic pipe fittings 10 are flexibly and reasonably arranged according to the structure of the oil tank. The utility model discloses replace original whole "crank slide valve control mechanism" with a "control change valve", the gyration that simultaneously singly gyrates and singly feeds into cold pilger mill (two roller, multiroll) is sent angle theta and is reduced to 90 by 120 to the rolling section length and the rolling efficiency of rolling mill have been improved.

Description

Control rotary valve for hydraulic single-return single-delivery of cold pilger mill

Technical Field

The utility model belongs to the technical field of hydraulic equipment, relate to the design and the manufacturing technology field of single feed mechanism of single gyration of cold pilger mill fluid pressure type, concretely relates to control change valve that is used for single feed back of cold pilger mill fluid pressure type.

Background

At present, with the continuous expansion of the application field of cold-rolled seamless pipes at home and abroad, the demand of the cold-rolled seamless pipes is also increased, and the demand of the cold-rolled pipe mill as equipment for producing the cold-rolled seamless pipes is also increased. The cold pilger mill can be divided into two rollers and a plurality of rollers (three rollers and five rollers) according to the number of the rollers; the rotary feeding mode can be divided into single-return single-feeding mode, double-return single-feeding mode and double-return double-feeding mode. The multi-roller mill generally only adopts single return and single feed, and the two-roller mill can adopt the three rolling modes.

The control mechanisms for the three rolling modes mainly comprise four types, namely a hydraulic type, a Martay disk type, a cam type (plane and cambered surface), a photoelectric type (direct current motor and servo motor) and the like. Although the photoelectric type is suitable for three rolling modes, the rotation feeding action is intermittent motion, the impact is large, the transmission is not stable, and the direct current motor or the servo motor is required to have large starting torque and rated power, so that the equipment cost of a manufacturer is increased, the power consumption of a user is increased, the energy waste is caused, the rolling cost is increased, and the energy-saving and environment-friendly concept advocated by the state is not met.

The rolling mode of the rolling mill has advantages and disadvantages, wherein the rolling mode of single rotation and single feeding has the advantages that the structure of the rotary feeding control mechanism is simpler, the rotary feeding action is stable and reliable, and the actual rolling section of the roller is longer; the defects are that the metal deformation and stress in the rolling area are not uniform enough, and the rolling precision is not very high. But for most of the pipes, the precision of the finished pipe is enough, and the equipment and the tool hole type are simple in design and convenient to manufacture. For the multi-roller mill, because the actual stroke of the roller is short and the stroke is difficult to lengthen, the multi-roller mill can only use a single-return single-feed mode, so that the single-return single-feed mechanism is widely applied to the cold pilger mill at present, and most of the cold pilgers adopt the single-return single-feed rolling mode no matter two rollers or multiple rollers (three rollers and five rollers) at present.

The single-rotation single-feed mechanism is an extremely important component in the cold pilger mill, and is operated in complete synchronization with the reciprocating motion of the mill stand, and the rotation and feed of the pipe blank must be completed quickly in a short time before and after a specified rear limit position in a reciprocating stroke of the stand.

The hydraulic rotary feeding mechanism is still widely applied at present due to the advantages of simple structure, stable transmission, convenient adjustment, low manufacturing cost and working energy consumption and the like. The traditional hydraulic control mechanism can only be used for a cold pilger mill with single return and single feed, wherein the rotary feed angle theta is 120 degrees, and the traditional rotary feed angle theta is larger, so that the rolling section which can be used by the roller is shorter and the rolling efficiency is lower.

At present, after the photoelectric rotary feed angle is reduced from 120 degrees to 90 degrees, a good rolling effect is obtained. The hydraulic system has stable transmission, sensitive response and easy control, and creates favorable conditions for properly reducing the rotary feeding angle of the hydraulic rotary feeding mechanism. For this purpose, the rotary feed angle is selected to be within 45 degrees (total 90 degrees) of the upper and lower parts of the frame crank when the machine head is at the rear dead point, and is determined as the hydraulic single-return single-feed rotary feed angle. Thereby improving the length of the rolling section of the roller and the service life, being beneficial to reducing the rolling pressure, improving the rolling performance and improving the productivity of the rolling mill.

However, according to the design scheme of the conventional "crank slide valve control mechanism", when the rotation feed angle is reduced to θ equals to 90 °, the following results are found after calculation and design: compared with the mechanism with the original rotary feed angle theta of 120 degrees, the mechanism has the advantages that although the overall structure is similar and the transmission structure is reasonable, the volume, the weight and the layout area are increased by a large amount.

Because the traditional crank slide valve control mechanism is adopted, on the structural principle, the distribution valve block for control consists of three blocks, namely a rotary control valve block, a feeding control valve block and an unloading control valve block, and the volume and the weight of each valve block are large. That is, the traditional "crank slide valve control mechanism" is composed of three valve blocks and a valve core, and needs to be matched with a set of crank connecting rod device, resulting in more complex structure, larger volume and layout area, more trouble in manufacturing (processing, assembling, debugging and the like), unstable control performance and higher production cost.

The crank slide valve control mechanism is essentially a structural combination of a crank connecting rod device and a stroke type reversing slide valve. The utility model discloses just in order to overcome above-mentioned shortcoming, carry out the innovation research and development to original "crank slide valve control mechanism", finally invent a control change valve for controlling cold pilger mill fluid pressure type list gyration list is sent into, replace original whole "crank slide valve control mechanism" with a "control change valve". Meanwhile, the rotary feed angle theta of the single-rotary single-feed cold pilger mill (two rollers and multiple rollers) is reduced to 90 degrees from 120 degrees, so that the rolling section length and the rolling efficiency of the rolling mill are improved.

The main defects and shortcomings in the prior art include:

(1) the traditional hydraulic control mechanism can only be used for a cold pilger mill with single return and single feed, wherein the rotary feed angle theta is 120 degrees, and the rotary feed angle theta is larger, so that the usable rolling section of the roller is shorter and the rolling efficiency is lower.

(2) Because the three-position three-way stroke reversing slide valve is adopted for control, a crank connecting rod device is required to be added, so that the rotary motion synchronously transmitted by the rolling mill head is converted into reciprocating motion, and more transmission mechanisms are provided.

(3) Because the slide valve device is adopted, the number of parts is large (mainly three valve blocks, one valve core and a crank connecting rod device), the volume and the layout area are large, and the adopted materials and the total weight are large.

(4) The overall structure and the transmission are complex, the processing of the integral crank shaft and the inner cavities of the valve blocks is troublesome, the device is inconvenient to assemble and adjust, the design and the calculation of stroke parameters are complicated, the control performance is not stable enough, and the production cost is very high.

SUMMERY OF THE UTILITY MODEL

To the above-mentioned defect that exists among the prior art and not enough, the utility model provides a control change valve that is used for single back of cold pilger mill fluid pressure type to an original whole "crank slide valve control mechanism" is replaced to "control change valve", reduces to 90 by 120 degrees with the gyration feed angle theta that singly gyrates single feed cold pilger mill (two roller, multiroll) simultaneously, thereby has improved the rolling section length and the rolling efficiency of rolling mill.

Therefore, the utility model adopts the following technical scheme:

a control rotary valve for hydraulic single-return single-feed of a cold pilger mill comprises a valve core, a valve body, a rotary motor oil inlet one-way valve, a rotary regulator, a regulator oil return one-way valve, a feed regulator, a feed motor oil inlet one-way valve, a hydraulic pipe fitting and a hydraulic system unloading one-way valve, wherein the valve core and the valve body form a main body of the rotary valve and are arranged along a horizontal position; the valve comprises a valve body, wherein 7 threaded interfaces are arranged right above the valve body and respectively include a P1 interface, an A1 interface, a T0 interface, an A2 interface, a P2 interface, a P interface and a T interface from left to right; the three paths of pressure oil output by the hydraulic pump system are respectively connected with an oil inlet one-way valve of a rotary motor, an oil inlet of an oil inlet one-way valve of a feeding motor and a P interface on a valve body; an oil outlet of the oil inlet one-way valve of the rotary motor is connected with an oil inlet of the rotary motor, and an oil outlet of the rotary motor is connected with a P1 interface on the valve body; an oil outlet of the oil inlet one-way valve of the feeding motor is connected with an oil inlet of the feeding motor, and an oil outlet of the feeding motor is connected with a P2 interface on the valve body; the interface of the rotary regulator is directly connected with the A1 interface on the valve body; the interface of the feeding regulator is connected with an A2 interface on the valve body; an oil inlet of the regulator oil return one-way valve is connected with a T0 interface on the valve body, and an oil outlet of the regulator oil return one-way valve is connected with an oil tank; an oil inlet of the hydraulic system unloading one-way valve is connected with a T interface on the valve body, and an oil outlet of the hydraulic system unloading one-way valve is connected with an oil tank; the pipeline of the hydraulic pipe fitting is reasonably arranged according to the structure of the oil tank.

Preferably, the rotary motor oil inlet one-way valve, the feeding motor and the feeding motor oil inlet one-way valve are arranged at one side of the valve body; the rotary regulator, the regulator oil return one-way valve, the feeding regulator and the hydraulic system unloading one-way valve are arranged at the other side of the valve body.

Preferably, the valve core and the valve body adopt a small clearance fit mode, and the fit clearance is controlled within 0.02-0.04 mm.

Preferably, the rotation speed of the valve core is the same as the rolling speed of the rolling mill.

Preferably, the maximum design rotation speed of the valve core is 120 r/min.

Preferably, 4 oil through grooves with the same depth are distributed on the working surface of the valve core, wherein 2 oil through grooves are narrow and 2 oil through grooves are wide.

Preferably, the valve core is matched with the valve body for transmission, and the left shoulder surface of the valve core is used for axial positioning; the key groove central plane at the left end of the valve core coincides with the axial central plane of the narrow oil through groove.

Preferably, the hole of valve body is the cylinder through-hole, and 7 screwed joint equipartitions directly over the valve body are being arranged in a word, and 6 footing screw holes are being evenly distributed to the bottom surface of valve body, will change the valve device through 6 screws and connect fixedly.

Preferably, the hydraulic tubing includes tubing and a coupling.

Preferably, the valve core is integrally manufactured by alloy steel, and the working surface is quenched; the valve body is integrally made of wear-resistant ball-milling cast iron.

Compared with the prior art, the beneficial effects of the utility model are that:

(1) after the rotary feed angle theta of the single-rotary single-feed cold pilger mill is reduced from 120 degrees to 90 degrees, the theoretical calculation proves that the rolling length and the service life of the roller can be greatly improved, the rolling pressure is favorably reduced, the rolling performance is improved, and the productivity of the rolling mill is improved.

(2) The control movement is the rotation movement which is synchronous with the transmission ratio of the machine head, so the complex crank-connecting rod device is saved, and the elastic coupling is directly used for connection transmission.

(3) The original 'slide valve device' is a stroke slide valve which is composed of three valve blocks and a valve core, and the 'rotary valve device' is only composed of two parts, namely a valve body and the valve core, so that the transmission structure is simplified, the number of the parts is reduced, the total weight is reduced, and materials are saved.

(4) The inner hole of the valve body of the rotary valve device can be processed by boring and grinding; the excircle of the valve core can be processed by turning and grinding; the oil grooves are communicated on the valve core, and the precision requirement is not high, so that the valve core can be milled on a vertical milling machine by means of a rotary indexing type special clamp, and the machining is simple and convenient.

(5) The design and calculation of the structural parameters are simple, visual and clear, the structure is compact, the transmission is simple and convenient, the control function is good, and the performance is stable. The assembly and the adjustment are convenient, the volume and the layout area are small, the weight is light, and the production cost is very low.

(6) The rotary valve device has wide application range, can be used for various single-return single-delivery type two-roller cold pilger mills, and can also be matched with various types of multi-roller (three-roller and five-roller) cold pilger mills for use.

(7) Because the utility model has the advantages of the above, so can carry out active popularization and application from now on, this will produce very big economic benefits and social to enterprise and society.

Drawings

Fig. 1 is a structural composition and working (control) schematic diagram of a control rotary valve for hydraulic single-return delivery of a cold pilger mill provided by the utility model.

Fig. 2 is a cross-sectional view of the E-E direction of the control rotary valve for hydraulic single-return delivery of the cold pilger mill provided by the present invention.

Fig. 3 is a sectional view of the F-F direction of the control rotary valve for hydraulic single-return single-feed of the cold pilger mill provided by the invention.

Fig. 4 is a sectional view of a-A, B-B and C-C of a control rotary valve for hydraulic single-return single-feed of a cold pilger mill provided by the present invention.

FIG. 5 is a schematic view of the layout of the rotary feed and rolling zones of a cold pilger mill.

Description of reference numerals: 1. a valve core; 2. a valve body; 3. a rotary motor; 4. the rotary motor is provided with an oil inlet one-way valve; 5. a rotation regulator; 6. an adjuster oil return check valve; 7. a feed regulator; 8. a feed motor; 9. the feeding motor is fed with an oil one-way valve; 10. a hydraulic pipe fitting; 11. the hydraulic system unloading check valve.

Detailed Description

The present invention will be described in detail with reference to the accompanying drawings and specific embodiments, which are only used for explaining the present invention, but not for limiting the present invention.

As shown in fig. 1, the utility model discloses a control rotary valve for single back of cold pilger mill fluid pressure type is sent, including eleven spare parts such as case 1, valve body 2, rotary motor 3, rotary motor oil feed check valve 4, rotary regulator 5, regulator oil return check valve 6, feed regulator 7, feed motor 8, feed motor oil feed check valve 9, hydraulic pressure pipe fitting 10 and hydraulic system off-load check valve 11, wherein case 1 and valve body 2 are the utility model discloses a two core parts.

Firstly, pressure oil pumped by a hydraulic pump system is divided into three paths and is respectively connected with an oil inlet of a rotary motor oil inlet one-way valve 4 and a feeding motor oil inlet one-way valve 9 and a P connector on a valve body 2. An oil outlet of the rotary motor oil inlet one-way valve 4 is connected with an oil inlet of the rotary motor 3, and an oil outlet of the rotary motor 3 is connected with a P1 interface on the valve body 2. An oil outlet of the oil inlet check valve 9 of the feeding motor is connected with an oil inlet of the feeding motor 8, and an oil outlet of the feeding motor 8 is connected with a P2 interface on the valve body 2.

Secondly, the interface of the rotary regulator 5 is directly connected with the A1 interface on the valve body 2; the port of the feed regulator 7 is connected to the a2 port on the valve body 2.

Finally, an oil inlet of the regulator oil return one-way valve 6 is connected with a T0 interface on the valve body 2, and an oil outlet of the regulator oil return one-way valve 6 is connected with an oil tank; an oil inlet of the hydraulic system unloading one-way valve 11 is connected with a T interface on the valve body 2, and an oil outlet of the hydraulic system unloading one-way valve 11 is connected with an oil tank.

Each joint adopts a threaded connector, and a pipe joint and an oil pipe are matched to form a hydraulic pipeline system. The rotary valve composed of the valve core 1 and the valve body 2 is arranged in a horizontal position as shown in figure 3, and 7 threaded interfaces on the valve body 2 are positioned right above. Among other elements, the rotary motor 3, the rotary motor oil inlet check valve 4, the feed motor 8, and the feed motor oil inlet check valve 9 are disposed at positions as close as possible to one side of the valve body 2. The rotary regulator 5, the regulator oil return one-way valve 6, the feeding regulator 7 and the hydraulic system unloading one-way valve 11 are arranged at the other side of the valve body 2 as far as possible. The pipelines of the hydraulic pipe fittings 10 can be flexibly and reasonably arranged according to the structure of the oil tank.

The core content of the utility model is the 'control rotary valve device' composed of two parts of a valve core 1 and a valve body 2, which is shown in the attached figures 2-4. The valve core 1 and the valve body 2 adopt a small clearance fit mode, and the fit clearance is controlled within 0.02-0.04 mm so as to ensure good sealing performance. The rotating speed n of the valve core 1 is the same as the rolling speed of the rolling mill, and the maximum design rotating speed n is 120 r/min.

Wherein the valve core 1 is integrally made of alloy steel, and the working surface needs to be quenched so as to improve the wear resistance of the valve core. 4 oil through grooves with the same depth are distributed on the working surface of the valve core 1, wherein 2 oil through grooves with the same depth are distributed on the working surface of the valve core 1, and 2 oil through grooves with the same depth are distributed on the working surface of the valve core 1. In the matching transmission process of the valve core 1 and the valve body 2, the left shoulder surface of the valve core 1 plays a role in axial positioning. The central plane of the key groove at the left end of the valve core 1 coincides with the axial central plane of the narrow oil through groove. The keyway serves two purposes: the first is directly connected with the machine head through an elastic coupling to transmit motion and a small amount of torque; and secondly, the key groove is used as a positioning reference when the machine head is matched with the movement of the machine head, namely, the key groove is just right above the machine head when the machine head is positioned at a rear dead center.

The valve body 2 is integrally made of wear-resistant nodular cast iron, and an inner hole of the valve body is a cylindrical through hole. And 7 threaded connectors which are arranged in a straight line are uniformly distributed right above the valve body 2, wherein the number of the threaded connectors used for rotary feeding of the rear dead center is 5, and the number of the threaded connectors used for system unloading is 2. 6 footing screw holes are evenly distributed on the bottom surface of the valve body 2, and are used for connecting and fixing the rotary valve device through 6 screws.

In fig. 3, 2 narrow oil through grooves with equal length are arranged on the valve core 1 from left to right, which are respectively used for 'rotation and feeding', so that the motor is communicated with the corresponding regulator for oil through. As shown in a-a or B-B in fig. 4, the theoretical value of the circumferential oil passing angle of the "narrow oil passing groove" is 90 °, the actual oil passing angle is smaller than the theoretical value in consideration of the diameter problem of the threaded interface related to the valve body 2, and the actual value of the circumferential oil passing angle of the "narrow oil passing groove" is 70 ° through calculation (calculation is performed according to the internal diameter of the valve body 2 being phi 115mm and the diameter of the threaded interface being phi 20 mm).

In the same figure 2, 2 wide oil through grooves with different lengths are arranged on the valve core 1 from left to right, wherein the left long wide oil through groove is used for oil return of the two regulators together, so that the two regulators are turned and fed to be communicated and return oil to an oil tank together. And a shorter wide oil through groove on the right is used for unloading the hydraulic system, so that the hydraulic system is communicated with an oil return pipe and returns oil to an oil tank. As shown in B-B or C-C in fig. 4, the theoretical values of the circumferential oil passing angles of the 2 "wide oil passing grooves" are 270 °, and the actual values of the circumferential oil passing angles of the "wide oil passing grooves" are 250 ° through calculation.

The utility model discloses a function is: the 'opening and closing' of oil outlets of the two hydraulic motors are controlled to rotate and feed, so that the purpose of controlling the 'one-rotation-one-stop' intermittent rotary motion of the two hydraulic motors is achieved. The two hydraulic motors are subjected to speed reduction transmission through respective gear pairs, and then drive the lever and the screw rod to output, so that the pipe blanks are respectively driven to rotate and feed.

The functions of the rotary adjuster and the feed adjuster are as follows: the oil storage device is used for adjusting the rotation angle and the feeding amount of the tube blank, and the rotation angle and the feeding amount are in direct proportion to the oil storage amount set by the regulators, so that the purpose of adjusting the rotation angle and the feeding amount of the tube blank can be achieved by adjusting the oil storage amount in the two regulators.

The control speed (rhythm) of the 'control rotary valve' must be synchronous or coordinated with the operation speed of the head of the cold pilger mill, and the oil output of the two hydraulic motors, namely the rotation angle of the output shafts of the two hydraulic motors, can be properly adjusted by adjusting the volumes of the oil filling cavities of the two regulators, so that the aim of adjusting the rotation angle and the feeding amount of the tube blank to the process requirement is finally achieved.

FIG. 5 is a schematic view of the layout of the rotary feed and rolling zones of a cold pilger mill. Corresponding to the control rotary valve, the rotary feed angles of the machine head at the rear dead center are all required to be 90 degrees, and the rest 270 degrees are rolling areas. The 2 narrow oil through grooves and the 2 wide oil through grooves are arranged in a 180-degree direction in the circumferential direction, wherein the lengths of the 2 narrow oil through grooves and the shorter wide oil through groove are equal.

The utility model relates to a special hydraulic control device that is used for cold pilger mill fluid pressure type "single gyration is single to send into" action, its essence is "cylinder type control commentaries on classics valve" of constituteing by two parts of case 1 and valve body 2.

Examples

The operation (control) principle of the rotary valve control device shown in fig. 1 will be described as follows:

the position of the rotary valve shown in fig. 1 is just in the period of rotation and feeding at the rear dead point (the range of the rotation feeding angle is 90 degrees), at this time, the rotary motor 3 and the feeding motor 8 are respectively communicated with the rotary regulator 5 and the feeding regulator 7 through 2 narrow oil through grooves, so that oil discharged from oil outlets of the two hydraulic motors are respectively filled in oil cavities of the corresponding regulators, other hydraulic branches are sealed, and the two hydraulic motors respectively rotate for a certain angle and finally respectively drive the rotation and feeding of the tube blank at the rear dead point after the speed reduction transmission of the respective gear pair.

When the valve core 1 rotates 90 degrees to finish the rotation and feeding actions and then continues to rotate 270 degrees, the valve core is in a forward and reverse stroke rolling area (the range is 270 degrees). At this time, the oil outlets of the two hydraulic motors for rotation and feeding are sealed, so that the two motors stop rotating. Meanwhile, the rotary regulator 5 and the feed regulator 7 are communicated with a T0 interface on the valve body 2 through 1 long wide oil through groove, so that the original filled oil in the inner cavities of the two regulators is discharged back to the oil tank through the regulator oil return one-way valve 6 under the action of the spring pressure, and the next working cycle is continued.

During this time (rolling zone also ranging 270 °), the oil outlets of the swivel and feed two hydraulic motors have been blocked. The main oil circuit (P interface) of the hydraulic system is communicated with the T interface on the valve body 2 through 1 short 'wide oil through groove', and then all oil pumped by the hydraulic pump flows to the oil tank through the hydraulic system unloading one-way valve 11, so that the system is unloaded, and pressure loss and system heating are reduced. The rolling mill thus completes the whole rolling cycle (back dead center turn-in + forward and reverse stroke rolling).

Thus, after the valve core rotates for a circle, the control work of the action of single rotation and single feeding in one rolling period is finished. When the rolling mill performs the rolling movement repeatedly, the synchronously rotating rotary valve also plays the control role of the circulation.

The above description is only for the preferred embodiment of the present invention and should not be taken as limiting the invention, and any modifications, equivalent replacements, and improvements made within the spirit and principle scope of the present invention should be included within the protection scope of the present invention.

Claims (10)

1. The utility model provides a control change valve that is used for cold pilger mill fluid pressure type to singly return and send, includes case (1), valve body (2), gyration motor (3), gyration motor oil feed check valve (4), gyration regulator (5), regulator oil return check valve (6), advance regulator (7), advance motor (8), advance motor oil feed check valve (9), hydraulic pressure pipe fitting (10) and hydraulic system off-load check valve (11), its characterized in that: the valve core (1) and the valve body (2) form a main body of the rotary valve and are arranged along the horizontal position; 7 threaded connectors are arranged right above the valve body (2), and are respectively a P1 connector, an A1 connector, a T0 connector, an A2 connector, a P2 connector, a P connector and a T connector from left to right; the three paths of pressure oil extracted by the hydraulic pump system are respectively connected with an oil inlet of a rotary motor oil inlet one-way valve (4), an oil inlet of a feeding motor oil inlet one-way valve (9) and a P interface on the valve body (2); an oil outlet of the rotary motor oil inlet check valve (4) is connected with an oil inlet of the rotary motor (3), and an oil outlet of the rotary motor (3) is connected with a P1 interface on the valve body (2); an oil outlet of the oil inlet check valve (9) of the feeding motor is connected with an oil inlet of the feeding motor (8), and an oil outlet of the feeding motor (8) is connected with a P2 interface on the valve body (2); the interface of the rotary regulator (5) is directly connected with the A1 interface on the valve body (2); the interface of the feeding regulator (7) is connected with the A2 interface on the valve body (2); an oil inlet of the regulator oil return one-way valve (6) is connected with a T0 interface on the valve body (2), and an oil outlet of the regulator oil return one-way valve (6) is connected with an oil tank; an oil inlet of the hydraulic system unloading one-way valve (11) is connected with a T interface on the valve body (2), and an oil outlet of the hydraulic system unloading one-way valve (11) is connected with an oil tank; and the pipelines of the hydraulic pipe fittings (10) are reasonably arranged according to the structure of the oil tank.

2. The control rotary valve for the hydraulic single-return single-feed of the cold pilger mill according to claim 1, characterized in that: the rotary motor (3), the rotary motor oil inlet one-way valve (4), the feeding motor (8) and the feeding motor oil inlet one-way valve (9) are arranged at one side of the valve body (2); the rotary regulator (5), the regulator oil return one-way valve (6), the feeding regulator (7) and the hydraulic system unloading one-way valve (11) are arranged at the other side of the valve body (2).

3. The control rotary valve for the hydraulic single-return single-feed of the cold pilger mill according to claim 1, characterized in that: the valve core (1) and the valve body (2) adopt a small-clearance fit mode, and the fit clearance is controlled within 0.02-0.04 mm.

4. The control rotary valve for the hydraulic single-return single-feed of the cold pilger mill according to claim 1, characterized in that: the rotating speed of the valve core (1) is the same as the rolling speed of a rolling mill.

5. The control rotary valve for the hydraulic single-return single-feed of the cold pilger mill according to claim 4, characterized in that: the maximum designed rotating speed of the valve core (1) is 120 r/min.

6. The control rotary valve for the hydraulic single-return single-feed of the cold pilger mill according to claim 1, characterized in that: 4 oil through grooves with the same depth are distributed on the working surface of the valve core (1), wherein 2 oil through grooves are narrow and 2 oil through grooves are wide.

7. The control rotary valve for the hydraulic single-return single-feed of the cold pilger mill according to claim 6, characterized in that: the valve core (1) is in matched transmission with the valve body (2), and the left shoulder surface of the valve core (1) is used for axial positioning; the key groove central plane at the left end of the valve core (1) is superposed with the axial central plane of the narrow oil through groove.

8. The control rotary valve for the hydraulic single-return single-feed of the cold pilger mill according to claim 1, characterized in that: the hole of valve body (2) is the cylinder through-hole, and 7 screwed joint equipartitions directly over valve body (2) are being arranged in a single line, and 6 footing screws are being evenly distributed to the bottom surface of valve body (2), will change the valve device through 6 screws and connect fixedly.

9. The control rotary valve for the hydraulic single-return single-feed of the cold pilger mill according to claim 1, characterized in that: the hydraulic pipe fitting (10) comprises an oil pipe and a pipe joint.

10. The rotary valve for controlling hydraulic single-return single-feed of a cold pilger mill according to any one of claims 1 to 9, characterized in that: the valve core (1) is integrally manufactured by alloy steel, and the working surface is quenched; the valve body (2) is integrally made of wear-resistant ball-milling cast iron.

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