WO2019173956A1

WO2019173956A1 - Core-making machine based on electrically-driven mold closing

Info

Publication number: WO2019173956A1
Application number: PCT/CN2018/078762
Authority: WO
Inventors: 李嘉; 王直良; 赵仁峰
Original assignee: 苏州明志科技有限公司
Priority date: 2018-03-12
Filing date: 2018-03-12
Publication date: 2019-09-19

Abstract

Disclosed is a core-making machine based on electrically-driven mold closing, comprising a frame, a lower moving cart, an upper moving cart, an upper core box lifting mechanism, a sand shooting unit, and a blowing unit, wherein the upper core box lifting mechanism mainly consists of four guide rod posts disposed in the frame, an upper core box lifting frame matching racks on the four guide rod posts by means of four sets of gear transmission mechanisms respectively, an upper core box servomotor, and a synchronization mechanism; an upper pressure head mechanism is provided, and is located above the upper core box lifting mechanism and provided with a lifting drive mechanism; the lifting drive mechanism comprises at least one set of electric cylinders each consisting of a servomotor and a lead screw, and at least one pair of mechanical linkage mechanisms; the outputs of the electric cylinders act on the upper pressure head mechanisms by means of the mechanical linkage mechanisms. The present invention implements the action and function of the core-making machine just by means of electric driving and pneumatic control, thereby improving the movement stability, synchronism and efficiency of the core-making machine. In addition, mold-closing locking is more reliable.

Description

Electric drive clamping core machine

Technical field

[0001] The present invention relates to a metal casting apparatus, and more particularly to a core making machine that uses an electric drive to achieve mold clamping.

Background technique

[0002] The core making machine is one of the important equipments for core sand forming in the foundry industry. Its working principle is: The core machine drives the various parts of the core box to close the mold, and the already mixed core sand is injected into the core box by compressed air. Then, the catalytic gas is introduced into the core box to harden the core sand in a short time to meet the process and production requirements, and then the mold is opened, and the core sand is removed from the core box.

[0003] At present, the core making machine usually adopts an upper and lower opening and closing mold structure, and the main driving mechanism is an upper pressing head mechanism, an upper moving trolley, a lower moving trolley, an upper core box lifting mechanism, a shooting mechanism, a blowing hood and an upper roof mechanism. And so on. The movement and lifting of the above-mentioned mechanism and the clamping and locking of the core box during the sandblasting are all realized by the output force of the hydraulic cylinder, so the existing core making machine is equipped with a complicated hydraulic station system.

[0004] Improvements in the clamping drive of the core making machine are currently concentrated on the setting of the hydraulic system. For example, Chinese invention patent CN103567394A discloses a core making machine including a frame, a work table, a table lifting mechanism, a lower core mechanism, a lower core box moving mechanism, a core box lifting mechanism, a sand shooting unit, and a moving blow. a hood mechanism, the lower core mechanism is located in front of the workbench, and the lower core mechanism is fixedly connected to the frame; the table lifting mechanism is a four-bar structure, and lifting hydraulic cylinders are respectively arranged on both sides of the workbench; The core box moving mechanism includes a drive cylinder, a core car, and a guide rail disposed on the table. The scheme is provided with driving hydraulic cylinders and four guiding rod structures on the left and right sides. The hydraulic cylinders, the guiding rods and the guiding sleeves are arranged outside the working table, which facilitates daily replacement and maintenance.

[0005] However, since the driving of the existing core making machine is mainly realized by a hydraulic cylinder or a hydraulic motor, there are some common disadvantages of the hydraulic system;

[0006] (1) Since the hydraulic system is greatly affected by environmental factors, the hydraulically driven upper mobile trolley and the lower mobile trolley have poor operational stability, and the flow and pressure parameters need to be constantly adjusted;

[0007] (2) The upper core box lifting mechanism on the core making machine generally has two hydraulic cylinders front and rear or left and right to drive the upper core box lifting frame due to structural reasons, but the existing hydraulic control technology is difficult to realize two hydraulic cylinders. Synchronous movement Therefore, it is also necessary to design a mechanical synchronization mechanism to coordinate the synchronous movement of the two cylinders, but even if the synchronization mechanism is added, the synchronization and positioning error of the core box lifting operation cannot be guaranteed to be <5_, so sometimes the core is guaranteed. The lifting and lowering of the box can stop the speed of the hydraulic cylinder, which affects the tempo efficiency of the whole machine;

[0008] (3) The clamping and holding pressure of the core box is realized by a hydraulic cylinder that is pressed down. Since the clamping force required for clamping is more than 200 kN, the hydraulic cylinder of the lower pressing mold also needs to be large. The final matching hydraulic station system has a large power. In addition, during the sand shooting and blowing, the hydraulic cylinder needs high pressure to maintain the pressure, which makes the whole process consume a lot of energy;

[0009] (4) The hydraulic system generates a large vibration noise during operation, which is not conducive to the health of the operator;

[0010] (5) The hydraulically driven core making machine has a lot of hydraulic pipelines. These pipelines are not easy to detect on the one hand, and on the other hand, the hydraulic oil cannot be cleaned;

[0011] (6) The lifting movement guide of the upper core pressing head and the upper core box of the existing core making machine are each designed with a set of 4 guiding mechanisms.

The structure takes up a lot of space and the manufacturing cost is high.

[0012] To overcome the problems caused by the use of hydraulic systems, one idea is to use electric drive clamping. However, in the core making machine, the locking force during mold clamping is usually between 100KN and 1000KN, and the structure of the single screw is about 200kN, and the cost is only about 200kN. It is very expensive and has a large outer volume. Therefore, it is generally considered by those skilled in the art that it is not feasible to employ electric drive clamping in a core making machine.

Summary of invention

technical problem

Problem solution

Technical solution

[0013] The object of the present invention is to provide an electric drive mold core machine, through structural improvement, without the use of a hydraulic system to achieve the functions and actions of the core machine, and to ensure the combination of the upper and lower core boxes The mold clamping force, as well as the synchronization and positioning accuracy of the upper core box lifting.

[0014] In order to achieve the above object, the technical solution adopted by the present invention is: an electric drive mold clamping core machine, including a frame, a lower moving trolley, an upper moving trolley, an upper core box lifting mechanism, a sand shooting unit, and a blowing a gas unit, wherein the sand shooting unit is provided with a shooting mechanism, and the blowing unit is provided with a blowing and an upper core mechanism. The upper moving trolley drives the sand shooting unit and the air blowing unit, and the upper core box lifting mechanism is mainly composed of four guiding rod columns disposed in the frame, respectively passing through four sets of gear transmission mechanisms and teeth on the four guiding rod columns The upper core box lifting frame, the upper core box servo motor and the synchronizing mechanism are configured; the upper pressing head mechanism is disposed above the upper core box lifting mechanism and has a lifting driving mechanism, and the lifting driving The mechanism includes at least one set of electric cylinders composed of a servo motor and a lead screw, at least one pair of mechanical linkages, and an output of the electric cylinder is applied to the upper ram mechanism via the mechanical linkage mechanism.

[0015] In the above technical solution, in use, the upper core box is fixed in the upper core box lifting frame, and the synchronous movement of the upper core box is realized by the synchronous movement of the four sets of gears along the four guide rod columns; the lower core box is fixedly moved in the lower part On the trolley, the lower moving trolley is fed into the clamping station; when the upper core box is lowered into position, the upper pressing mechanism is pressed under the driving of the lifting drive mechanism to provide the clamping force and lock to the upper core box. Tight force. Wherein, at least one pair of mechanical linkage mechanisms are disposed in the lifting drive mechanism of the upper pressing head, and when the mold is closed, the self-locking structure of the mechanical linkage mechanism is used to provide a locking force to the upper core box, thereby lifting the driving mechanism It can be driven by servo motor itself, and it can be self-locking and tightened by mechanical linkage mechanism to ensure sufficient locking force.

[0016] In a preferred technical solution, the mechanical linkage mechanism is composed of a three-axis connecting member and a connecting rod, and the three-axis connecting member has a first rotating shaft connected to the four-pole column or frame, and is connected to a second rotating shaft on the output end of the electric cylinder is connected to the third rotating shaft on the connecting rod, and the other end of the connecting rod has a fourth rotating shaft connected to the upper pressing head mechanism, wherein the third rotating shaft is located at the first a lower side of the connecting shaft of the rotating shaft and the second rotating shaft, in the initial position, the third rotating shaft and the first rotating shaft are located on both sides of the connecting line of the second rotating shaft and the fourth rotating shaft, and are pressed down to the clamping mode In the position, the third rotating shaft forms a straight line with the second rotating shaft and the fourth rotating shaft or is located on the same side of the first rotating shaft and the fourth rotating shaft, and constitutes a self-locking structure.

[0017] In a preferred embodiment, the lift drive mechanism of the upper ram mechanism is provided with two electric cylinders, and the two electric cylinders synchronously drive the mechanical linkage mechanisms on the corresponding sides.

[0018] In the above technical solution, the four corners of the upper indenter mechanism respectively cooperate with the racks on the four-bar column to form a guiding structure to realize synchronous movement.

[0019] Alternatively, the four corners of the upper indenter mechanism are respectively provided with independent guide rods and guide sleeves to form a guiding structure to ensure synchronization and positioning of the lifting and lowering of the indenter.

[0020] In a preferred technical solution, the lifting drive mechanism consists of two sets of electric cylinders arranged symmetrically and two pairs symmetrically arranged. The mechanical linkage mechanism is configured, and the two pairs of mechanism linkage mechanisms are respectively located on the front and rear sides or the left and right sides of the electric cylinder.

[0021] In the upper core box lifting mechanism, the four sets of gear transmission mechanisms are connected by a rotating shaft and synchronously driven by a servo reducer. Alternatively, in the upper core box lifting mechanism, the four sets of gear transmission mechanisms are divided into two groups, and one servo reducer is installed on each side of the frame, and the two servo reducers control the movement through the synchronous servo controller to realize the upper core. Synchronous drive of the box lift box.

[0022] In the above technical solution, the rack on the four-pilot column is a rack directly processed on one side of the column. Alternatively, the rack on the four-pilot column is a standard rack fixedly attached to one side of the column.

[0023] In the above technical solution, the lower moving trolley drives the rack and pinion through the servo reducer to realize the forward and backward movement.

[0024] The upper moving trolley drives the rack and pinion through the servo reducer to realize left and right movement.

Advantageous effects of the invention

Beneficial effect

[0025] Due to the above technical solutions, the present invention has the following advantages over the prior art:

[0026] 1. The invention combines the mechanical linkage structure in the electric drive structure, and eliminates the hydraulic system that the traditional core making machine must be configured, especially the model with the specification above 20L, and only uses the electric drive and pneumatic control to realize the core making machine. The action and function avoid the disadvantages of the above-mentioned hydraulic system, and the controllability of the electric drive also improves the smoothness, synchronization and high efficiency of the core machine;

[0027] 2. By canceling the upper head of the core shooter, the hydraulic cylinder is used for lifting and holding pressure, and the servo motor + screw drive is adopted.

+The combination of the connecting rods makes the lifting movement more stable, the mechanical linkage self-locking is more reliable, and the servo motor drive is more stable;

[0028] 3. The up and down movement of the core box of the core shooter is driven by a servo reducer combined with a rack and pinion, which has higher synchronism than the original two cylinders, and the intermediate stop position has higher precision;

[0029] 4. The guiding of the upper pressing head and the upper core box frame is guided by a coaxial four-lead rod structure, which simplifies the structure and saves space.

[0030] 5. Both the upper mobile trolley and the lower mobile trolley are driven and controlled by a servo reducer, which is faster and more stable than the hydraulic cylinder drive.

Brief description of the drawing DRAWINGS

1 is a schematic structural view of an embodiment of the present invention;

Figure 2 is a left side view of Figure 1;

3 is a partially enlarged schematic view of the mechanical link portion of FIG. 1.

[0034] wherein: 1, the base of the rack; 2, the lower mobile trolley; 3, the lower core box; 4, the rack column; 5, four guide rod column; 6, the upper core box lifting frame; 7, the upper core box; 8, the upper mobile trolley; 9, blowing and top core mechanism; 10, the shooting mechanism; 11, the top of the rack; 12, mechanical linkage; 13, the upper head mechanism; 1 4, air bag; Electric cylinder; 16, sand bucket; 17, protective screen; 18, three shaft connection; 19, connecting rod; 20, first shaft; 21, second shaft; 22, third shaft; 23, fourth shaft.

Invention embodiment

Embodiments of the invention

[0035] The present invention will be further described below in conjunction with the accompanying drawings and embodiments:

[0036] Embodiment 1: As shown in FIG. 1 to FIG. 2, an electric drive mold clamping core machine adopts a solid four-column frame structure, including a frame base 1 and a machine disposed on the frame 1 The column 4 is arranged on the top 11 of the frame on the frame column 4, with a sandblasting and blowing station in the middle, a sanding station on the side, a coring station on the front side and a protective screen 17 around the front.

[0037] The lower core box 3 is fixed to the lower moving cart 2, and the front and rear movement is realized by the lower moving cart 2. In the embodiment, the lower moving cart drives the rack and pinion through the servo reducer to realize the forward and backward movement. The upper core box 7 is fixed on the upper box lifting frame 6, and is moved up and down by the upper core box lifting frame 6.

[0038] The head mechanism 10 and the air blowing and upper core mechanism 9 are arranged side by side on the upper moving trolley 8, and the left and right movements are realized by the upper moving trolley 8, so that the intermediate stations respectively constitute the sand shooting station and blow at different times. At the same time, through the upper moving trolley 8, the shooting mechanism 10 can be moved to the side sanding station, and the docking sand bucket 16 can be sanded. In the present embodiment, the upper moving cart 8 drives the rack and pinion through the servo reducer to achieve left and right motion.

[0039] In the embodiment, the upper core box lifting mechanism is mainly raised by the four-pole column 5 disposed in the frame, and the upper core box respectively matched by the four sets of gear transmission mechanisms and the racks on the four-pole column 5 Box 6, the upper core box servo motor and the synchronizing mechanism are formed, and the four sets of gear transmission mechanisms are connected by a rotating shaft and synchronously driven by a servo reducer. The rack on the four-pole column is a rack that is directly machined on one side of the column. [0040] an upper ram mechanism 13 is provided, the upper ram mechanism 13 is located above the upper core box lifting mechanism and has a lifting drive mechanism, and the lifting drive mechanism comprises at least one set of electric power composed of a servo motor and a screw The cylinder 15 has at least one pair of mechanical linkages 12, and the output of the electric cylinder 15 acts on the upper ram mechanism 13 via the mechanical linkage mechanism 12. The four corners of the upper indenter mechanism respectively form a guiding structure by the gears and the racks on the four-lead column to realize synchronous movement.

[0041] wherein, referring to FIG. 3, the mechanical linkage 12 is composed of a three-rotor connector 18 and a connecting rod 19, and the three-rotor connector 18 has a connection on the four-pole column or frame. a first rotating shaft 20, a second rotating shaft 21 connected to the output end of the electric cylinder, a third rotating shaft 22 connected to the connecting rod 19, and the other end of the connecting rod 19 has a fourth connected to the upper pressing head mechanism 13. a rotating shaft 23, wherein the third rotating shaft is located below a side of the first rotating shaft and the second rotating shaft. In the initial position, the third rotating shaft and the first rotating shaft are located at the second rotating shaft and the first The two rotating shafts are connected to the second rotating shaft and the fourth rotating shaft to form a straight line or the first rotating shaft is located on the second rotating shaft and the fourth rotating shaft when the two rotating shafts are pressed down to the clamping position. The same side of the line forms a self-locking structure.

[0042] In the embodiment, the lifting drive mechanism is composed of two sets of electric cylinders arranged symmetrically and two pairs of mechanical linkages arranged symmetrically, and the two pairs of mechanism linkage mechanisms are respectively located at the front and rear sides of the electric cylinder.

[0043] In this embodiment, the upper core box lifting mechanism and the upper pressing head mechanism use the same set of four guide rods 5, which saves equipment space and is convenient for maintenance operations.

[0044] In this embodiment, the control technology of the hydraulic cylinder + hydraulic valve is replaced by the electric drive + servo control technology, and the non-hydraulic drive design of the core making machine can be realized, and the avoidance of the hydraulic system is greatly affected by the external environment change. a series of questions, such as:

[0045] * can ensure that the parallelism error of the upper core box at any position in the lifting movement is <±0.2mm/m;

[0046] * All drive parts can meet the stop position error <±0.1mm without fixed mechanical limit;

[0047] * There is no trouble with the piping of the hydraulic pipe and the cleaning caused by the leakage of the pipeline;

[0048] * does not generate a large hydraulic pump starting noise;

[0049] In this embodiment, the mechanical structure of the connecting rod self-locking replaces the original large hydraulic cylinder pressure-preserving action, so that the clamping of the upper and lower core boxes is more reliable, and the output energy is more saved.

[0050] Embodiment 2: An electric drive mold clamping core machine, the whole machine structure is similar to that of the first embodiment. Wherein, in the upper core box lifting mechanism, the four sets of gear transmission mechanisms are divided into two groups of connections, and one servo is installed on each side of the rack. The reducer and the two servo reducers realize the synchronous drive of the upper box lifting frame by controlling the movement of the synchronous servo controller.

[0051] The rack on the four-pilot column is a standard rack fixedly connected to one side of the column.

Claims

Claim

[Claim 1] An electric drive mold clamping core machine, comprising: a frame, a lower moving trolley, an upper moving trolley, an upper core box lifting mechanism, a sand shooting unit, a blowing unit, and the shooting unit is provided in the sand shooting unit a head mechanism, wherein the air blowing unit is provided with a blowing air and an upper core mechanism, and the upper moving trolley drives the sand shooting unit and the air blowing unit, wherein: the upper core box lifting mechanism is mainly disposed at The four-way guide column in the frame is respectively composed of four sets of gear transmission mechanisms and the upper core box lifting frame matched with the racks on the four-guide column, the upper core box servo motor and the synchronization mechanism; and an upper pressing head mechanism is provided; The upper ram mechanism is located above the upper core box lifting mechanism and has a lifting drive mechanism, and the lifting driving mechanism comprises at least one set of electric cylinders composed of a servo motor and a screw rod, and at least one pair of mechanical linkage mechanisms, An output of the electric cylinder is applied to the upper ram mechanism via the mechanical linkage mechanism.

[Claim 2] The electric drive core molding machine according to claim 1, wherein: the mechanical linkage mechanism is composed of a three-rotor coupling member and a connecting rod, and the three-rotor connecting member has a connection a first rotating shaft on the four-pole column or the frame, a second rotating shaft connected to the output end of the electric cylinder, a third rotating shaft connected to the connecting rod, and the other end of the connecting rod has a connection mechanism with the upper pressing head a fourth rotating shaft, wherein the third rotating shaft is located below a side of the first rotating shaft and the second rotating shaft connecting line, and in the initial position, the third rotating shaft and the first rotating shaft are located at the second rotating shaft and The two sides of the fourth rotating shaft are connected to the clamping position, the third rotating shaft and the second rotating shaft and the fourth rotating shaft form a straight line or the first rotating shaft is located at the second rotating shaft and the first rotating shaft The same side of the four-axis connection constitutes a self-locking structure.

[Claim 3] The electric drive core molding machine according to claim 1, wherein: in the lifting drive mechanism of the upper indenter mechanism, two electric cylinders are provided, and the two electric cylinders are synchronized The action drives the mechanical linkage mechanism on the corresponding side.

[Claim 4] The electric drive core-molding machine according to claim 1, wherein: the four corners of the upper indenter mechanism respectively form a guiding structure by a gear and a rack on the four-lead column, respectively Synchronous movement.

[Claim 5] The electric drive mold core machine according to claim 1, wherein: the four corners of the upper head mechanism are respectively provided with independent guide rods and guide sleeves to form a guiding structure to ensure the indenter Lifting Synchronization and positioning.

[Claim 6] The electric drive mold core machine according to claim 1, wherein: the lift drive mechanism is composed of two sets of electric cylinders arranged symmetrically and two pairs of mechanical linkage mechanisms arranged symmetrically. The two pairs of mechanism linkage mechanisms are respectively located on the front and rear sides or the left and right sides of the electric cylinder.

[Claim 7] The electric drive mold core machine according to claim 1, wherein: in the upper core box lifting mechanism, the four sets of gear transmission mechanisms are connected by a rotating shaft, and are synchronously driven by a servo reducer. .

[Claim 8] The electric drive mold core machine according to claim 1, wherein: in the upper core box lifting mechanism, the four sets of gear transmission mechanisms are divided into two groups of connections, on both sides of the rack A servo reducer is installed, and the two servo reducers realize the synchronous drive of the upper box lifting frame by controlling the motion of the synchronous servo controller.

[Claim 9] The electric drive core molding machine according to claim 1, wherein the rack on the four-piston column is a rack directly processed on one side of the column.

[Claim 10] The electric drive mold core machine according to claim 1, wherein: the rack on the four-piston column is a standard rack fixedly attached to one side of the column.

[Claim 11] The electric drive mold core machine according to claim 1, wherein: the lower moving cart drives the rack and pinion to realize front and rear movement by a servo reducer.

[Claim 12] The electric drive mold core machine according to claim 1, wherein: the upper moving cart drives the rack and pinion to realize left and right movement by a servo reducer.