Synchronous lifting device based on electro-hydraulic double locking

Abstract

The utility model relates to a synchronous lifting device based on electro-hydraulic double locking, and relates to the field of casting. The lifting frame is movably connected to the longitudinal moving vehicle of the molten steel casting machine, the lifting driving mechanisms are located on the two sides of the lifting frame correspondingly and used for driving the lifting frame to move in the vertical direction of the longitudinal moving vehicle, and each lifting driving mechanism comprises the first driving mechanism and the second driving mechanism which can be locked. And the second driving mechanism is in a follow-up state relative to the first driving mechanism. Under the condition, unbalance loading force of the lifting mechanism can be overcome, synchronous lifting of the steel ladle is achieved, a double-locking mechanism is achieved, the risk of pressure-loss gliding can be avoided, safety is high, and bearing capacity is high.

Description

Technical Field

[0001] The utility model relates to the technical field of casting, in particular to a synchronous lifting device based on electro-hydraulic double locking. Background Art

[0002] In recent years, with the acceleration of my country's industrialization, the demand for steel castings has continued to increase, placing higher demands on the quality and production efficiency of steel castings. In the production process of steel castings, the pouring machine is one of the key equipment. Its main function is to accurately and smoothly pour high-temperature molten steel into the mold.

[0003] At present, most of the casting machines widely used in the market simply use hydraulic cylinders as lifting mechanisms. Although this design meets production needs to a certain extent, it also has many problems and hidden dangers:

[0004] 1. Risk of pressure loss and slide: The working principle of the hydraulic system is to transmit pressure through hydraulic oil to drive the cylinder piston up and down. However, the hydraulic system is susceptible to problems such as oil leakage and seal failure, which can cause the system pressure to drop. Once pressure loss occurs, the cylinder may lose its supporting force, causing the pouring machine to slide down in a dangerous situation. In a high-temperature and high-pressure working environment, the pressure loss and slide of the hydraulic cylinder may not only cause damage to the equipment, but also endanger the life of the operator. Especially during the pouring process, the temperature of the molten steel can reach over 1500℃, and any accident may lead to serious safety accidents.

[0005] 2. Slow response: The response speed of a simple hydraulic system is relatively slow. Especially when precise adjustment of the lifting height is required, the control accuracy of the hydraulic cylinder is difficult to meet the requirements. This may lead to instability during the pouring process and affect the quality of the casting. Summary of the Invention

[0006] The purpose of the utility model is to provide a synchronous lifting device based on electro-hydraulic double locking to solve the problems existing in the above-mentioned prior art.

[0007] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0008] The present application provides a synchronous lifting device based on electro-hydraulic double locking, comprising:

[0009] A lifting frame movably connected to the longitudinal movement vehicle of the molten steel pouring machine; and

[0010] Two lifting drive mechanisms are provided, one on each side of the lifting frame, for driving the lifting frame to move in the vertical direction of the longitudinal transfer vehicle;

[0011] Each of the lifting drive mechanisms includes a first drive mechanism and a second drive mechanism, both of which are lockable, and the second drive mechanism is in a follow-up state relative to the first drive mechanism.

[0012] In a possible implementation, the first driving mechanism includes:

[0013] A reducer, which is installed on the lifting frame and is a double-shaft type;

[0014] A servo motor, which is in driving connection with the power input end of the reducer and has electronic locking;

[0015] There are two half-couplings, and the first ends of the two half-couplings are respectively connected to the two power output ends of the reducer;

[0016] There are two universal couplings, the first ends of the two universal couplings are respectively connected to the second ends of the two half couplings;

[0017] There are two gear shafts, the first ends of the two gear shafts are respectively connected to the second ends of the two universal joints, the second ends of the two gear shafts are sleeved with gears, and the two gear shafts are mounted on the lifting frame through bearing seats; and

[0018] There are two racks, which are installed on the longitudinal transfer vehicle and are respectively engaged with the two gears.

[0019] In a possible implementation, the servo motor is electronically locked via a holding brake, and the holding brake is mounted on a power output shaft of the servo motor.

[0020] In a possible implementation, the second driving mechanism includes:

[0021] A middle ear oil cylinder, which is mounted on the longitudinal transfer vehicle via a mounting bracket and has a hydraulic locking feature;

[0022] There are two middle ear oil cylinders, and the lifting ends of the two middle ear oil cylinders are respectively connected to the two sides of the bottom of the lifting frame.

[0023] In a possible implementation, the middle ear oil cylinder is hydraulically locked by installing a hydraulic lock in its oil circuit.

[0024] In a possible implementation, the middle ear oil cylinder is a constant pressure oil cylinder and does not independently drive the lifting frame to move.

[0025] In one possible implementation, the control circuit of the middle ear oil cylinder includes at least:

[0026] A pressure reducing valve, used for adjusting the oil inlet pressure of the middle ear oil cylinder;

[0027] a one-way sequence valve for controlling the oil discharge pressure of the middle ear oil cylinder;

[0028] an electromagnetic reversing valve, used to control the middle ear oil cylinder and the first driving mechanism to achieve synchronous movement;

[0029] A hydraulically controlled one-way valve to prevent the pipeline from sliding due to pressure relief; and

[0030] The pressure relay is used to send a signal when the oil pressure tends to decrease, control the oil pump to supply oil and replenish pressure.

[0031] In a possible implementation, the lifting frame is connected to the track on the longitudinal transfer vehicle in a rolling manner along the vertical direction via a plurality of guide wheels.

[0032] In a possible implementation, the track on the longitudinal transfer vehicle is one of a T-type track, a C-type track, a linear guide rail, and a guide column.

[0033] The beneficial effects of the technical solution provided by the utility model include at least:

[0034] The system features a movably connected lifting frame to the longitudinal transport vehicle of the molten steel pouring machine, and two lifting drive mechanisms located on either side of the lifting frame for driving the lifting frame in the vertical direction of the longitudinal transport vehicle. Each lifting drive mechanism includes a first drive mechanism and a second drive mechanism, both of which are lockable, with the second drive mechanism in a follower state relative to the first drive mechanism. This design not only overcomes the off-center load of the lifting mechanism, achieving synchronized lifting and lowering of the ladle, but also provides a dual locking mechanism to prevent the risk of sliding due to pressure loss, resulting in high safety and strong load-bearing capacity. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation to the present invention.

[0036] Figure 1 A front view of a synchronous lifting device based on electro-hydraulic double locking provided by an exemplary embodiment of the present utility model is shown.

[0037] Figure 2 A side view of a synchronous lifting device based on electro-hydraulic double locking provided by an exemplary embodiment of the present utility model is shown.

[0038] Figure 3 A front view of a synchronous lifting device based on electro-hydraulic double locking provided by an exemplary embodiment of the present invention is shown, after which a longitudinal moving vehicle is hidden.

[0039] Figure 4 A side view of a synchronous lifting device based on electro-hydraulic double locking provided by an exemplary embodiment of the present invention is shown, after which a longitudinal transfer vehicle is hidden.

[0040] In the picture:

[0041] 1. Lifting frame; 2. Longitudinal transfer vehicle; 3. Lifting drive mechanism;

[0042] 31. First driving mechanism; 32. Second driving mechanism;

[0043] 311. Reducer; 312. Servo motor; 313. Half coupling; 314. Universal coupling; 315. Gear shaft; 316. Gear; 317. Bearing seat; 318. Rack;

[0044] 321. Middle ear cylinder; 322. Mounting bracket. DETAILED DESCRIPTION

[0045] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0046] Among them, the same parts are represented by the same figure marks. It should be noted that the words "front", "rear", "left", "right", "up" and "down" used in the following description refer to the directions in the drawings of the present utility model specification, and the words "bottom" and "top", "inside" and "outside" refer to directions toward or away from specific parts, respectively. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model specification, the meaning of "multiple" is two or more.

[0047] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0048] The present application is driven by a servo motor and a hydraulic cylinder, with the servo motor as the main drive and the hydraulic cylinder as the auxiliary drive. This can not only realize the precise positioning function of the servo motor, but also realize the high load performance of the hydraulic cylinder. During the pouring process, the most important thing is safety performance. By realizing the dual locking function through the servo motor and the hydraulic cylinder, even in the event of emergencies such as power outages, it can ensure that the ladle will not suddenly fall and cause a safety accident. In addition, the response speed of a simple hydraulic system is relatively slow. Especially when the lifting height needs to be precisely adjusted, the control accuracy of the hydraulic cylinder is difficult to meet the requirements, which may cause instability during the pouring process and affect the quality of the casting. By using a servo motor as the main drive, fast response and precise positioning can be achieved, and the lifting speed can be linearly adjusted during the lifting process, thereby improving the pouring efficiency and the quality of the casting. In addition, the double-output shaft reducer is connected to the gears at the left and right ends through a coupling to lift and lower on the longitudinal transport vehicle, and standard guide rollers are installed on both sides to synchronize the left and right sides, ensuring that the lifting process of the lifting frame is smooth and without jamming.

[0049] Figure 1 The figure shows a front view of a synchronous lifting device based on electro-hydraulic double locking provided by an exemplary embodiment of the present invention. Figure 2 A side view of a synchronous lifting device based on electro-hydraulic double locking provided by an exemplary embodiment of the present invention is shown. The synchronous lifting device based on electro-hydraulic double locking comprises: a lifting frame 1 movably connected to the longitudinal transfer vehicle 2 of the molten steel pouring machine, and two lifting drive mechanisms 3 respectively located on both sides of the lifting frame 1, the lifting drive mechanism 3 is used to drive the lifting frame 1 to move in the vertical direction of the longitudinal transfer vehicle 2; wherein, each lifting drive mechanism 3 comprises a first drive mechanism 31 and a second drive mechanism 32, both of which can be locked, and the second drive mechanism 32 is in a follow-up state relative to the first drive mechanism 31.

[0050] In the embodiment of the present application, the vertical direction refers to a direction perpendicular to the horizontal plane.

[0051] In the embodiment of the present application, when applied to a molten steel pouring machine, the lifting frame 1 can move longitudinally following the longitudinal transfer vehicle 2, and can perform lifting and lowering movements on the longitudinal transfer vehicle 2, while a transverse transfer vehicle can be installed on the lifting frame 1, and a supporting arm for grasping the ladle can be installed on the transverse transfer vehicle to realize movement in three directions.

[0052] In detail, Figure 3 The figure shows a front view of a synchronous lifting device based on electro-hydraulic double locking provided by an exemplary embodiment of the present invention, after the longitudinal transfer vehicle is hidden. Figure 4The figure shows a side view of a synchronous lifting device based on electro-hydraulic double locking provided by an exemplary embodiment of the present invention, which is hidden behind a longitudinal moving vehicle. The first driving mechanism 31 includes a reducer 311, a servo motor 312, two half-couplings 313, two universal couplings 314, two gear shafts 315, and two racks 318. The reducer 311 is installed on the lifting frame 1 and is a double-output shaft type. The servo motor 312 is connected to the power input end of the reducer 311 and has electronic locking. The first half-couplings 313 and the second half-couplings 313 are connected to the first half-couplings 313. One end is respectively connected to the two power output ends of the reducer 311, the first ends of the two universal couplings 314 are respectively connected to the second ends of the two half-couplings 313, the first ends of the two gear shafts 315 are respectively connected to the second ends of the two universal couplings 314, the second ends of the two gear shafts 315 are respectively provided with gears 316, and the two gear shafts 315 are installed on the lifting frame 1 through bearing seats 317. The two racks 318 are installed on the longitudinal movement vehicle 2, and the two racks 318 are respectively engaged with the two gears 316.

[0053] In some embodiments, the servo motor 312 is electronically locked by a holding brake, which is installed on the power output shaft of the servo motor 312. When the system is powered off or stopped, the holding brake automatically locks the motor shaft to prevent it from rotating.

[0054] In some embodiments, the servo motor 312 is electronically locked by an electromagnetic brake, which is automatically activated when power is lost to lock the motor shaft.

[0055] Furthermore, the above-mentioned second driving mechanism 32 includes a middle ear cylinder 321 installed on the longitudinal movement vehicle 2 through a mounting frame 322, which has hydraulic locking; wherein, there are two middle ear cylinders 321, and the lifting ends of the two middle ear cylinders 321 are respectively connected to the two sides of the bottom of the lifting frame 1.

[0056] In some embodiments, the middle ear oil cylinder 321 is hydraulically locked by installing a hydraulic lock in its oil circuit. When the system loses pressure, the hydraulic lock is automatically closed to prevent oil backflow, thereby maintaining the position of the piston rod.

[0057] In some embodiments, the middle ear oil cylinder 321 is hydraulically locked by installing an accumulator in its oil circuit. When the system loses pressure, the accumulator releases the stored hydraulic energy to maintain the pressure of the oil cylinder and prevent it from sliding down.

[0058] It is worth mentioning that the middle ear cylinder 321 is a constant pressure cylinder. No matter it is raised or lowered, the middle ear cylinder 321 only bears half of the lifting weight and cannot drive the lifting frame 1 to move alone. It is always in an auxiliary follow-up state.

[0059] Specifically, the control circuit of the middle-ear oil cylinder 321 includes at least a pressure reducing valve, a one-way sequence valve, an electromagnetic reversing valve, a hydraulically controlled one-way valve, and a pressure relay. The pressure reducing valve is used to adjust the oil inlet pressure of the middle-ear oil cylinder 321, and the one-way sequence valve is used to control the oil discharge pressure of the middle-ear oil cylinder 321, so that the rising chamber of the oil cylinder always maintains a constant pressure, ensuring a constant oil cylinder push force. The opening and closing of the electromagnetic reversing valve are synchronized with the first drive mechanism 31 to achieve synchronous movement of the middle-ear oil cylinder 321 and the first drive mechanism 31. The hydraulically controlled one-way valve is directly installed at the oil cylinder port to prevent the pipeline from depressurizing and sliding. The pressure relay is used to send a signal when the oil pressure tends to decrease, controlling the oil pump to supply oil and replenish pressure.

[0060] As a supplementary explanation, the lifting frame 1 is connected to the track on the longitudinal transfer vehicle 2 in a rolling manner in the vertical direction via a plurality of guide wheels. Optionally, the track on the longitudinal transfer vehicle 2 is one of a T-shaped track, a C-shaped track, a linear guide rail, and a guide column. In one example, the track on the longitudinal transfer vehicle 2 is a C-shaped track.

[0061] It is understood that the present application also provides a control method for a synchronous lifting device based on electro-hydraulic double locking, which is applied to the above-mentioned synchronous lifting device based on electro-hydraulic double locking, and the method includes:

[0062] generating a first start signal, wherein the first start signal is used to instruct the first driving mechanism to operate;

[0063] Generate a second start signal, the second start signal is used to instruct the second drive mechanism to follow the first drive mechanism 31 to perform synchronous movement;

[0064] Sending a first start signal and a second start signal;

[0065] In response to the first driving mechanism and the second driving mechanism receiving the first starting signal and the second starting signal, synchronously driving the lifting frame to perform lifting motion;

[0066] In response to the lifting movement stopping, sending a locking signal to the first drive mechanism and the second drive mechanism;

[0067] In response to the first driving mechanism and the second driving mechanism receiving the locking signal, both the first driving mechanism and the second driving mechanism are locked.

[0068] In the embodiments of the present application, the first drive mechanism employed is a servo motor driving a gear and rack transmission, coupled with a second drive mechanism supplemented by a hydraulic cylinder. This reduces the load and wear on the gear transmission, while also utilizing a reducer and servo motor as the primary lift control, resulting in high control accuracy and a fast response speed. Furthermore, the mechanism can overcome the biasing forces of the lifting mechanism, achieving synchronous lifting of the ladle. Furthermore, the dual locking mechanism prevents the risk of pressure loss and downward movement, providing high safety and a strong load-bearing capacity.

[0069] In the embodiments disclosed in this utility model, the terms "installed," "connected," "connected," and "fixed" should be understood in a broad sense. For example, "connected" can mean a fixed connection, a detachable connection, or an integral connection; "connected" can mean a direct connection or an indirect connection through an intermediary. Those skilled in the art will understand the specific meanings of the above terms in the embodiments disclosed in this utility model based on specific circumstances.

[0070] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. A synchronous lifting device based on electro-hydraulic double locking, characterized in that: include: A lifting frame (1) is movably connected to a longitudinal transfer vehicle (2) of a molten steel pouring machine; as well as Two lifting drive mechanisms (3) are respectively located on both sides of the lifting frame (1) and are used to drive the lifting frame (1) to move in the vertical direction of the longitudinal transfer vehicle (2); Each of the lifting drive mechanisms (3) comprises a first drive mechanism (31) and a second drive mechanism (32), both of which can be locked, and the second drive mechanism (32) is in a follow-up state relative to the first drive mechanism (31).

2. The synchronous lifting device based on electro-hydraulic double locking according to claim 1 is characterized in that: The first driving mechanism (31) comprises: A reducer (311) is mounted on the lifting frame (1) and is a double-shaft type; A servo motor (312) is in driving connection with the power input end of the reducer (311) and has electronic locking; There are two half-couplings (313), and the first ends of the two half-couplings (313) are respectively connected to the two power output ends of the reducer (311); There are two universal couplings (314), the first ends of the two universal couplings (314) are respectively in transmission connection with the second ends of the two half couplings (313); There are two gear shafts (315), the first ends of the two gear shafts (315) are respectively connected to the second ends of the two universal couplings (314), the second ends of the two gear shafts (315) are each sleeved with a gear (316), and the two gear shafts (315) are both installed on the lifting frame (1) through a bearing seat (317); and There are two racks (318), and the two racks (318) are installed on the longitudinal transfer vehicle (2). The two racks (318) are respectively engaged with the two gears (316).

3. The synchronous lifting device based on electro-hydraulic double locking according to claim 2 is characterized in that: The servo motor (312) is electronically locked via a holding brake, and the holding brake is mounted on a power output shaft of the servo motor (312).

4. The synchronous lifting device based on electro-hydraulic double locking according to claim 1 is characterized in that: The second driving mechanism (32) comprises: A middle ear oil cylinder (321) is mounted on the longitudinal transfer vehicle (2) via a mounting frame (322) and has a hydraulic locking feature; There are two middle ear oil cylinders (321), and the lifting ends of the two middle ear oil cylinders (321) are respectively connected to the two sides of the bottom of the lifting frame (1).

5. The synchronous lifting device based on electro-hydraulic double locking according to claim 4 is characterized in that: The middle ear oil cylinder (321) is hydraulically locked by installing a hydraulic lock in its oil circuit.

6. The synchronous lifting device based on electro-hydraulic double locking according to claim 4 is characterized in that: The middle ear oil cylinder (321) is a constant pressure oil cylinder and does not independently drive the lifting frame (1) to move.

7. The synchronous lifting device based on electro-hydraulic double locking according to claim 4 is characterized in that: The control circuit of the middle ear oil cylinder (321) comprises at least: A pressure reducing valve for adjusting the oil inlet pressure of the middle ear oil cylinder (321); A one-way sequence valve for controlling the oil discharge pressure of the middle ear oil cylinder (321); An electromagnetic reversing valve, used for controlling the middle ear oil cylinder (321) and the first driving mechanism (31) to achieve synchronous movement; A hydraulically controlled one-way valve to prevent the pipeline from sliding due to pressure relief; and The pressure relay is used to send a signal when the oil pressure tends to decrease, control the oil pump to supply oil and replenish pressure.

8. The synchronous lifting device based on electro-hydraulic double locking according to claim 1, characterized in that: The lifting frame (1) is connected to the track on the longitudinal transfer vehicle (2) in a rolling manner along the vertical direction via a plurality of guide wheels.

9. The synchronous lifting device based on electro-hydraulic double locking according to claim 7, characterized in that: The track on the longitudinal transfer vehicle (2) is one of a T-type track, a C-type track, a linear guide rail, and a guide column.

Images