Energy-saving rolling support and radially symmetrical hydraulic cylinder drum type intelligent braking structure of screw press

Abstract

An energy-saving rolling support and radial symmetric hydraulic cylinder drum type intelligent braking structure of a screw press comprises a motor, the motor is fixed to an upper cross beam, an output shaft of the motor is connected with a gear, the gear is meshed with an outer ring gear on a flywheel, the flywheel and a first screw are connected and rotate together, and the top of the first screw is tensioned through a first nut; hydraulic cylinders are symmetrically arranged above the upper cross beam in the radial direction, hydraulic oil enters cavities of the hydraulic cylinders through oil conveying pipelines on the upper cross beam, advancing and retreating of piston push rods are achieved, drum brakes are installed on the front portions of the piston push rods, friction plates are symmetrically arranged on the end faces of the drum brakes, and when the piston push rods are ejected out, the friction plates make contact with the lower end faces of flywheels. Therefore, the braking of the screw rod mechanism is realized; according to the invention, the space is saved, and the braking sensitivity is improved; the friction loss of the screw press in the operation process is reduced, and the energy utilization rate is increased.

Description

Technical Field

[0001] The invention belongs to the technical field of screw presses in forging equipment, and in particular relates to an energy-saving rolling support and radially symmetrical hydraulic cylinder drum type intelligent braking structure of a screw press. Background Art

[0002] Screw presses have become the preferred equipment for users in many fields such as forging and refractory materials today because of their simple structure, low cost, and easy use and maintenance. Screw presses use a set of screw nuts as a spiral motion pair to convert rotational motion into linear motion within the machine frame. According to the drive mode, screw presses can be mainly divided into friction type, hydraulic type, electric type, and clutch type.

[0003] The nut of the double-disc friction screw press is often placed in the crossbeam on the machine body, and the screw rotates in the nut and moves up and down. The nut and the screw both use sliding friction pairs, and the friction pairs between the nut and the screw use thick oil lubrication, which causes large friction losses, transmission efficiency is only about 30%, and serious energy waste. In the three types of screw presses, hydraulic, electric, and clutch, the nut is placed on the slider, and the screw rotates in place in the upper crossbeam hole without moving up and down. The nut and the screw on the slider also use sliding friction pairs. The friction pairs between the nut and the screw use thick oil lubrication, which causes large friction losses, transmission efficiency is only about 30%, and low energy utilization.

[0004] Electric screw presses often use hydraulic braking on the end face of the flywheel, which makes the flywheel bear a certain additional load axially, and the structure is also complex, with high maintenance costs. The double-disc friction screw press uses a spring-loaded steel belt friction wheel and a brake ramp on the machine body, which results in a complex structure and can only brake near the top dead center.

[0005] In summary, the existing screw presses have the following deficiencies in the friction pair between the screw and the nut, the screw support method, and the flywheel brake:

[0006] (1) The nuts and screws of screw presses widely used in industry all adopt the transmission method of sliding friction pairs. The sliding friction pairs between the nuts and screws adopt the method of heavy oil dispersion lubrication, which causes large friction loss and transmission efficiency of only about 30%, serious energy waste, and serious friction and wear of the screws, especially the nuts. The force transmission boss in the middle of the screw structure of the screw press and the upper crossbeam bearing ring also adopt sliding friction pairs, which also have greater energy loss than the rolling friction method.

[0007] (2) The flywheel end face braking method of the electric screw press or the belt brake braking method of the double-disc friction screw press has the problems of large brake size, low space utilization, low braking efficiency, and insufficient braking response, resulting in a large amount of time and energy loss.

[0008] (3) The belt brake uses a triangular rigid plate and a brake ramp fixed on the machine body, which means that the screw press can only be braked near the top dead center position, and cannot be braked at any position. In addition, the braking force cannot be adjusted during the braking process based on the amount of kinetic energy absorbed, resulting in serious energy waste during the braking process, reduced working reliability, severe wear of the friction material, and a short service life. Summary of the invention

[0009] In order to overcome the shortcomings of the above-mentioned prior art, the purpose of the present invention is to provide an energy-saving rolling support and radially symmetrical hydraulic cylinder drum intelligent braking structure for a screw press, which adopts a symmetrical hydraulic cylinder brake shoe friction wheel structure for braking the driven parts of the main screw and the passive friction disk and reliably stopping the slider, thereby greatly saving space and improving the braking sensitivity; the screw and the nut adopt a rolling friction pair of a planetary roller screw and a screw energy-saving rolling bearing support method, and an energy-saving rolling support method combining a ball screw and a rolling bearing, which greatly reduces the friction loss of the screw press during operation and improves the energy utilization rate.

[0010] In order to achieve the above object, the technical solution adopted by the present invention is:

[0011] A screw press energy-saving rolling support and radially symmetrical hydraulic cylinder drum intelligent brake structure includes a motor 30, which is fixed on an upper crossbeam 10. The output shaft of the motor 30 is connected to a gear 31, which is meshed with an outer ring gear on a flywheel 3. The flywheel 3 is connected to a first screw rod 2 and rotates together. The top of the first screw rod 2 is tightened by a first nut 1.

[0012] The hydraulic cylinder 4 is radially symmetrically arranged above the upper cross beam 10. The hydraulic oil enters the cavity of the hydraulic cylinder 4 through the oil pipeline 11 on the upper cross beam 10 to realize the forward and backward movement of the piston push rod 5. A drum brake 6 is installed in front of the piston push rod 5. The friction plate 7 is symmetrically arranged on the end surface of the drum brake 6. When the piston push rod 5 is pushed out, the friction plate 7 contacts the lower end surface of the flywheel 3, thereby realizing the braking of the screw mechanism.

[0013] A flange 13 is fixed on the upper crossbeam 10, and the upper end face of the flange 13 supports the flywheel 3 through the first thrust bearing 8, and the lower end face of the flange 13 is supported on the first screw 2 through the second thrust bearing 15. An upper rolling bearing 9 and a lower rolling bearing 14 are arranged up and down inside the flange 13, and the upper rolling bearing 9 and the lower rolling bearing 14 support the rotation of the first screw 2, and the upper rolling bearing 9 and the lower rolling bearing 14 are positioned with a sleeve 12.

[0014] The upper crossbeam 10 is supported on the lower crossbeam 24 through the column 18. The overall body composed of the upper crossbeam 10, the column 18 and the lower crossbeam 24 is tightened by the second screw 26 and the second nut 25. A workbench 23 is fixed on the lower crossbeam 24. The thread 28 on the first screw 2 is connected to the screw 27 in the ball screw 21 through a ball screw kinematic pair. The ball screw 21 is installed in the first slider 20. The first slider 20 is connected to the second slider 17 through the support plate 19. The second slider 17 moves up and down along the guide rail 16, and the guide rail 16 is fixed on the column 18, thereby converting the rotational motion of the first screw 2 into the translational motion of the first slider 20 to realize the operation of the press.

[0015] The column 18 is equipped with a sensor 22 for detecting the speed and displacement of the first slider 20, which automatically detects the dynamic displacement and speed signal of the first slider 20 during its up and down movement online, as well as the corresponding electro-hydraulic system hardware and software intelligent control strategy to achieve braking and stopping of the first slider 20 at any position.

[0016] That is to say, the new structure of the hydraulic cylinder brake shoe friction wheel with radially symmetrical arrangement of the screw of the present invention, the rolling friction pair of the screw and the nut using a planetary roller screw, a new energy-saving rolling bearing support method for the screw, and online monitoring of the movement displacement speed of the slider can reliably and efficiently brake and stop at any position of the working stroke of the slider, thereby realizing energy-saving and efficient intelligent automatic control of braking of the screw press.

[0017] In summary, compared with the existing technology, the present invention has the following advantages:

[0018] (1) The invented screw press adopts energy-saving rolling support in the axial direction of the pressure-bearing boss in the middle of the main screw and in the radial direction of the cylindrical surface of the upper rod diameter of the screw. A rolling friction pair of a planetary roller screw is adopted between the screw and the nut. The transmission efficiency is as high as more than 80%, and it can be applied to ultra-large loads. The friction and wear of the friction surface material are greatly reduced, and the energy-saving effect is excellent.

[0019] (2) The invented screw press system has a symmetrical hydraulic cylinder brake shoe friction wheel structure for braking the driven parts of the first screw and the passive friction disk and reliably stopping the slider, and the braking and stopping hydraulic cylinders are symmetrically arranged on the top of the upper crossbeam, and the cylindrical surface of the brake wheel hub and the flywheel are integrated, which simplifies the structure, greatly saves space, and improves the sensitivity of braking.

[0020] (3) The invented screw press is equipped with a sensor that can dynamically detect the instantaneous speed and displacement of the slider during its movement. The invention also develops an electro-hydraulic system hardware and software intelligent control strategy based on the computer's online automatic detection of the dynamic displacement and speed signals during the slider's up and down movement, thereby achieving reliable and efficient intelligent braking and stopping of the slider at any position. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic structural diagram of an embodiment of the present invention.

[0022] Figure 2 It is a schematic diagram of the overall body of the screw press according to an embodiment of the present invention. DETAILED DESCRIPTION

[0023] The present invention is described in detail below in conjunction with embodiments and drawings.

[0024] Reference Figure 1 A screw press energy-saving rolling support and radially symmetrical hydraulic cylinder drum intelligent brake structure includes a motor 30, which is fixed to an upper crossbeam 10 through a support plate 29. The output shaft of the motor 30 is connected to a gear 31, and the gear 31 is meshed with an outer ring gear on a flywheel 3 to transmit the power of the motor 30 to the flywheel 3. The flywheel 3 and the first screw 2 are connected by a key, and the flywheel 3 rotates together with the first screw 2. The top of the first screw 2 is tightened by a first nut 1.

[0025] Reference Figure 1 A hydraulic cylinder 4 is radially symmetrically arranged above the upper cross beam 10. The hydraulic oil enters the cavity of the hydraulic cylinder 4 through the oil pipeline 11 on the upper cross beam 10 to realize the forward and backward movement of the piston push rod 5. A drum brake 6 is installed in front of the piston push rod 5. The friction plate 7 is symmetrically arranged on the end surface of the drum brake 6. When the piston push rod 5 is pushed out, the friction plate 7 contacts the lower end surface of the flywheel 3, thereby realizing the braking of the screw mechanism.

[0026] Reference Figure 1 A flange 13 is fixed to the upper cross beam 10 by bolts, the upper end face of the flange 13 supports the flywheel 3 through the first thrust bearing 8, and the lower end face of the flange 13 is supported on the first screw 2 through the second thrust bearing 15. An upper rolling bearing 9 and a lower rolling bearing 14 are arranged up and down inside the flange 13. The upper rolling bearing 9 and the lower rolling bearing 14 support the rotation of the first screw 2, and the upper rolling bearing 9 and the lower rolling bearing 14 are positioned radially between the cylindrical surface of the upper rod diameter of the supporting screw with a sleeve 12.

[0027] Reference Figure 1 and Figure 2The upper crossbeam 10 is supported on the lower crossbeam 24 through the column 18. The integral body formed by the upper crossbeam 10, the column 18 and the lower crossbeam 24 is tightened by the second screw 26 and the second nut 25. The workbench 23 is fixed on the lower crossbeam 24.

[0028] The thread 28 on the first screw 2 is connected to the screw 27 in the ball screw 21 through a ball screw kinematic pair. The ball screw 21 is installed in the first slider 20. The first slider 20 is connected to the second slider 17 via a support plate 19. The second slider 17 moves up and down along the guide rail 16 fixed on the fuselage column 18. The guide rail 16 is fixed on the column 18, thereby converting the rotational motion of the first screw 2 into the translational motion of the first slider 20 to realize the operation of the press.

[0029] Reference Figure 1 The column 18 is equipped with a sensor 22 for detecting the speed and displacement of the first slider 20, which automatically detects the dynamic displacement and speed signals of the first slider 20 during the up and down movement online, as well as the corresponding electro-hydraulic system hardware and software intelligent control strategy, so as to achieve reliable and efficient braking and stopping of the first slider 20 at any position.

Claims

1. An energy-saving rolling support and radially symmetrical hydraulic cylinder drum type intelligent braking structure for a screw press, characterized in that: The invention comprises a motor (30), the motor (30) is fixed on the upper crossbeam (10), the output shaft of the motor (30) is connected to a gear (31), the gear (31) is meshed with an outer ring gear on a flywheel (3), the flywheel (3) is connected to a first screw rod (2) and rotates together, and the top of the first screw rod (2) is tightened by a first nut (1); A hydraulic cylinder (4) is radially symmetrically arranged above the upper cross beam (10). Hydraulic oil enters the cavity of the hydraulic cylinder (4) through an oil delivery pipeline (11) on the upper cross beam (10), thereby realizing the forward and backward movement of the piston push rod (5). A drum brake (6) is installed in front of the piston push rod (5). Friction plates (7) are symmetrically arranged on the end surface of the drum brake (6). When the piston push rod (5) is pushed out, the friction plate (7) contacts the lower end surface of the flywheel (3), thereby realizing the braking of the screw mechanism. A flange (13) is fixed on the upper crossbeam (10); the upper end surface of the flange (13) supports the flywheel (3) through a first thrust bearing (8); the lower end surface of the flange (13) is supported on the first screw (2) through a second thrust bearing (15); an upper rolling bearing (9) and a lower rolling bearing (14) are arranged in the upper and lower parts of the flange (13); the upper rolling bearing (9) and the lower rolling bearing (14) support the first screw (2) to rotate; and a shaft sleeve (12) is used to position the upper rolling bearing (9) and the lower rolling bearing (14).

2. The structure according to claim 1, characterized in that: The upper crossbeam (10) is supported on the lower crossbeam (24) through the column (18); the upper crossbeam (10), the column (18) and the lower crossbeam (24) form an integral body which is tightened by a second screw (26) and a second nut (25); a workbench (23) is fixed on the lower crossbeam (24); the thread (28) on the first screw (2) is connected to the screw (27) in the ball screw (21) through a ball screw kinematic pair; the ball screw (21) is installed in the first slider (20); the first slider (20) is connected to the second slider (17) through a support plate (19); the second slider (17) moves up and down along a guide rail (16); the guide rail (16) is fixed on the column (18); thereby the rotational motion of the first screw (2) is converted into the translational motion of the first slider (20), thereby realizing the operation of the press.

3. The structure according to claim 2, characterized in that: The column (18) is provided with a sensor (22) for detecting the speed and displacement of the first slider (20), and the dynamic displacement and speed signal of the first slider (20) during the up and down movement are automatically detected online, as well as the corresponding electro-hydraulic system hardware and software intelligent control strategy, so as to achieve braking and stopping of the first slider (20) at any position.

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