CN108262452A - A kind of electricity drives molding core making machine - Google Patents

Abstract

The invention discloses an electric drive mold-joining core-making machine, which comprises a frame, a lower moving trolley, an upper moving trolley, an upper core box lifting mechanism, a sand shooting unit, and an air blowing unit, and is characterized in that: the upper core box is lifted The mechanism is mainly composed of four guide rod columns arranged in the frame, the lifting frame of the upper core box, the core box servo motor and the synchronous mechanism respectively through four sets of gear transmission mechanisms and the racks on the four guide rod columns; The upper pressing head mechanism is located above the lifting mechanism of the upper core box and has a lifting drive mechanism. The lifting driving mechanism includes at least one set of electric cylinders composed of servo motors and screw rods, and at least one pair of mechanical linkages. rod mechanism, the output of the electric cylinder acts on the upper pressure head mechanism through the mechanical linkage mechanism. The present invention only uses electric drive and pneumatic control to realize the action and function of the core making machine, which improves the movement stability, synchronization and high efficiency of the core making machine; meanwhile, the mold clamping and locking are more reliable.

Description

An Electric Drive Molding Core Making Machine

technical field

The invention relates to a metal casting device, in particular to a core making machine which adopts electric drive to realize mold clamping.

Background technique

The core making machine is one of the important equipment for core sand molding in the foundry industry. Its working principle is: the core making machine drives the various parts of the core box to close the mold, and injects the mixed core sand into the core box through 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 ejected from the core box and taken away.

At present, the core making machine usually adopts the upper and lower opening and closing structure. The main driving mechanism is composed of the upper pressing head mechanism, the upper moving trolley, the lower moving trolley, the lifting mechanism of the upper core box, the shooting head mechanism, the blowing cover and the upper top plate mechanism. The movement and lifting of the existing above-mentioned mechanisms and the mold clamping and locking of the core box during sand shooting and air blowing are all realized by the output force of the hydraulic cylinder, so the existing core making machines will be equipped with a complex hydraulic station system.

For the improvement of the mold clamping drive of the core making machine, it is currently concentrated in the setting of the hydraulic system. For example, Chinese invention patent CN103567394A discloses a core making machine, including a frame, a workbench, a workbench lifting mechanism, a lower core jacking mechanism, a lower core box moving mechanism, an upper core box lifting mechanism, a sand shooting unit, a mobile blowing The air cover mechanism, the lower core mechanism is located in front of the workbench, and the lower core mechanism is fixedly connected with the frame; the lift mechanism of the workbench is a four-guide rod structure, and lifting hydraulic cylinders are respectively arranged on both sides of the workbench; The moving mechanism of the lower core box includes a driving hydraulic cylinder, a core-combining trolley and a guide rail arranged on the workbench. In this scheme, driving hydraulic cylinders and four guide rod structures are arranged on the left and right sides, and the hydraulic cylinders, guide rods, and guide sleeves are all arranged outside the workbench, which facilitates daily replacement and maintenance.

However, since the drive of existing core making machines is mainly realized by hydraulic cylinders or hydraulic motors, there are some common shortcomings of hydraulic systems;

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

(2) Due to the structure of the core box lifting mechanism on the core making machine, there are generally two hydraulic cylinders at the same time driving the core box lifting frame at the same time, but the existing hydraulic control technology is difficult to realize the synchronous action of the two hydraulic cylinders. Therefore, it is also necessary to design a set of mechanical synchronization mechanism to coordinate the synchronous action of the two cylinders, but even if the synchronization mechanism is added, it cannot guarantee the synchronization of the core box lifting action and the positioning error <5mm, so sometimes in order to ensure the core box lifting It is necessary to slow down the speed of the hydraulic cylinder to stop in place, which affects the cadence efficiency of the whole machine;

(3) The mold clamping and pressure maintaining of the core box is realized through a hydraulic cylinder that presses down. Since the clamping force required for mold clamping must be above 200kN, the hydraulic cylinder for mold clamping also needs to be large, and the final matching The power of the hydraulic station system is very large. In addition, during sand shooting and air blowing, the hydraulic cylinder needs high pressure maintenance, which makes the whole process consume a lot of energy;

(4) The hydraulic system will generate a lot of vibration noise during operation, which is not conducive to the health of operators;

(5) There are many hydraulic pipelines in the hydraulically driven core making machine. Once these pipelines leak, on the one hand, it is not easy to detect, and on the other hand, the leakage of hydraulic oil cannot be cleaned;

(6) The lifting action guides of the upper pressing head and the upper core box of the existing core making machine are each designed with a set of 4 guide rod mechanisms. The structure occupies a large space and the manufacturing cost is high.

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 required to be between 100KN and 1000KN, and if a structure such as a servo motor is used with a screw, the maximum rated dynamic load of a single screw is about 200kN, and the cost It is very expensive and has a large external volume. Therefore, those skilled in the art generally believe that it is not feasible to use electric drive mold clamping in core making machines.

Contents of the invention

The object of the present invention is to provide an electric drive core making machine for clamping molds. Through structural improvement, various functions and actions of the core making machine can be realized without using a hydraulic system, and the clamping and locking of the upper and lower core boxes can be guaranteed. force, as well as the synchronization and positioning accuracy of the core box lifting.

In order to achieve the above-mentioned purpose of the invention, the technical solution adopted in the present invention is: an electric drive mold-joining core-making machine, including a frame, a lower moving trolley, an upper moving trolley, an upper core box lifting mechanism, a sand shooting unit, and an air blowing unit, The sand shooting unit is provided with a shooting head mechanism, the air blowing unit is provided with an air blowing and upper core mechanism, the upper moving trolley drives the sand shooting unit and the air blowing unit, and the upper core box lifts The mechanism is mainly composed of four guide rod columns arranged in the frame, the lifting frame of the upper core box, the core box servo motor and the synchronous mechanism respectively through four sets of gear transmission mechanisms and the racks on the four guide rod columns; The upper pressing head mechanism is located above the lifting mechanism of the upper core box and has a lifting drive mechanism. The lifting driving mechanism includes at least one set of electric cylinders composed of servo motors and screw rods, and at least one pair of mechanical linkages. rod mechanism, the output of the electric cylinder acts on the upper pressure head mechanism through the mechanical linkage mechanism.

In the above technical solution, when in use, the upper core box is fixed in the lifting frame of the upper core box, and the synchronous movement of the four sets of gears along the four guide rod columns realizes the synchronous lifting of the upper core box; the lower core box is fixed on the lower mobile trolley, The lower mobile trolley is sent to the mold clamping station; when the mold is clamped, after the upper core box is lowered in place, the upper pressure head mechanism is driven down by the lifting drive mechanism to provide mold clamping force and locking force for the upper core box. Among them, at least one pair of mechanical link mechanisms are set in the lifting drive mechanism of the upper pressing head. When the mold is closed, the self-locking structure of the mechanical link mechanism is used to provide a locking force on the upper core box. Thus, the lifting drive mechanism It can be driven by a servo motor, and the self-locking force is applied through the mechanical linkage mechanism to ensure sufficient locking force.

In a preferred technical solution, the mechanical linkage mechanism is composed of a three-shaft connecting piece and a connecting rod, and the three-shaft connecting piece has a first rotating shaft connected to the four-guide rod column or frame, and is connected to the output of the electric cylinder. The second rotating shaft on the end, the third rotating shaft connected on the connecting rod, the other end of the connecting rod has the fourth rotating shaft connected on the upper pressing head mechanism, wherein, the third rotating shaft is located between the first rotating shaft and the second rotating shaft Below the side of the connecting line of the two rotating shafts, at the initial position, the third rotating shaft and the first rotating shaft are located on both sides of the connecting line between the second rotating shaft and the fourth rotating shaft, when pressed down to the mold clamping 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 as the first rotating shaft on the line connecting the second rotating shaft and the fourth rotating shaft, forming a self-locking structure.

In a preferred technical solution, two electric cylinders are provided in the lifting drive mechanism of the upper pressing head mechanism, and the two electric cylinders act synchronously to drive the corresponding mechanical linkage mechanisms respectively.

In the above technical solution, the four corners of the upper pressing head mechanism respectively cooperate with the racks on the four guide rod columns through gears to form a guiding structure to realize synchronous movement.

Alternatively, the four corners of the upper pressing head mechanism are respectively provided with independent guide rods and guide sleeves to form a guiding structure to ensure the synchronization and positioning of the lifting head.

In a preferred technical solution, the lifting drive mechanism is composed of two sets of symmetrically arranged electric cylinders and two pairs of symmetrically arranged mechanical linkages, and the two pairs of mechanism linkages are respectively located on the front and rear sides or left and right sides of the electric cylinder .

In the lifting mechanism of the upper core box, four sets of gear transmission mechanisms are connected through rotating shafts and driven synchronously by a servo reducer. Alternatively, in the lifting mechanism of the upper core box, the four sets of gear transmission mechanisms are divided into two groups and connected, and a servo reducer is installed on both sides of the frame, and the two servo reducers are controlled by a synchronous servo controller to achieve core loading. Synchronous drive of the box lifting frame.

In the above technical solution, the rack on the column with four guide rods is a rack directly processed on one side of the column. Alternatively, the rack on the four-guide column is a standard rack fixedly connected to one side of the column.

In the above technical solution, the lower moving trolley realizes forward and backward movement by driving the rack and pinion through the servo reducer.

The upper moving trolley realizes the left and right movement by driving the rack and pinion through the servo reducer.

Due to the use of the above-mentioned technical solutions, the present invention has the following advantages compared with the prior art:

1. By combining the mechanical linkage structure in the electric drive structure, the present invention cancels the hydraulic system that must be configured in the traditional core making machine, especially for models with specifications above 20L, and only uses electric drive and pneumatic control to realize the movement and operation of the core making machine. function, avoiding a series of problems and disadvantages of the above-mentioned hydraulic system, and the controllability of the electric drive also improves the movement stability, synchronization and efficiency of the core making machine;

2. By canceling the upper pressure head of the core shooter and adopting the hydraulic cylinder for lifting and maintaining pressure, and adopting the combination of servo motor + screw drive + connecting rod, the lifting action is more stable, the mechanical connecting rod self-locking is more reliable, and the servo motor drive is more stable ;

3. The up and down movement of the upper core box frame of the core shooter is driven by a servo reducer combined with a rack and pinion, which is more synchronous than the original two oil cylinders, and the accuracy of the stop position is higher;

4. The guidance of the upper pressure head and the upper core box frame is guided by a coaxial four-guide rod structure, which simplifies the structure and saves space;

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

Description of drawings

Fig. 1 is the structural representation of the embodiment of the present invention;

Fig. 2 is the left view of Fig. 1;

FIG. 3 is a partially enlarged schematic view of the mechanical linkage part in FIG. 1 .

Among them: 1. Rack base; 2. Lower mobile trolley; 3. Lower core box; 4. Rack column; 5. Four guide rod columns; 6. Upper core box lifting frame; 7. Upper core box; 8. Upper part Mobile trolley; 9. Air blowing and upper core mechanism; 10. Shooting head mechanism; 11. Top of frame; 12. Mechanical linkage mechanism; 13. Upper pressure head mechanism; 14. Air bag; 15. Electric cylinder; 16 17, protective enclosure; 18, three-shaft connector; 19, connecting rod; 20, first shaft; 21, second shaft; 22, third shaft; 23, fourth shaft.

Detailed ways

The present invention will be further described below in conjunction with accompanying drawing and embodiment:

Embodiment 1: As shown in Fig. 1 to Fig. 2, an electric drive mold-joining core-making machine adopts a solid four-column frame structure, including a frame base 1 and a frame column 4 arranged on the frame 1 , the frame top 11 that is arranged on the frame column 4, in the middle is the sand shooting, air blowing station, the side is the sanding station, the front side is the coring station, and the surrounding is the protective screen 17.

The lower core box 3 is fixed on the lower moving trolley 2, and moves back and forth through the lower moving trolley 2. In this embodiment, the lower moving trolley realizes the forward and backward movement through the rack and pinion driven by the servo reducer. The upper core box 7 is fixed on the upper core box lifting frame 6, and moves up and down through the upper core box lifting frame 6.

The shooting 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 movement is realized through the upper moving trolley 8, so that the middle station constitutes a sand shooting station and an air blowing station at different times , At the same time, through the upper mobile trolley 8, the shooting head mechanism 10 can move to the sanding station on the side, and the docking sand bucket 16 realizes sanding. In this embodiment, the upper moving trolley 8 realizes left and right movement by driving the rack and pinion through the servo reducer.

In this embodiment, the lifting mechanism of the upper core box is mainly composed of the four guide rod columns 5 arranged in the frame, and the upper core box lifting frame 6 that cooperates with the racks on the four guide rod columns 5 through four sets of gear transmission mechanisms, respectively. The upper core box is composed of a servo motor and a synchronous mechanism. The four sets of gear transmission mechanisms are connected by rotating shafts and driven synchronously by a servo reducer. The rack on the four-guide rod column is directly processed on one side of the column.

An upper pressing head mechanism 13 is provided. The upper pressing head mechanism 13 is located above the upper core box lifting mechanism and has a lifting drive mechanism. The lifting driving mechanism includes at least one set of electric cylinders 15 composed of servo motors and screw mandrels. At least one pair of mechanical link mechanisms 12 , the output of the electric cylinder 15 acts on the upper pressing head mechanism 13 through the mechanical link mechanisms 12 . The four corners of the upper pressing head mechanism cooperate with the racks on the four guide rod columns respectively through gears to form a guiding structure, so as to realize synchronous movement.

Wherein, referring to accompanying drawing 3, described mechanical link mechanism 12 is made up of three-rotating-axis connector 18 and connecting rod 19, and described three-rotating-axis connector 18 has the first rotating shaft that is connected on described four guide bar column or frame 20, the second rotating shaft 21 connected to the output end of the electric cylinder, the third rotating shaft 22 connected to the connecting rod 19, the other end of the connecting rod 19 has a fourth rotating shaft 23 connected to the upper head mechanism 13, Wherein, the third rotating shaft is located below the side of the line connecting the first rotating shaft and the second rotating shaft. On both sides of the line, when pressing down to the mold clamping position, the third shaft forms a straight line with the second shaft and the fourth shaft or is located on the same line as the first shaft on the line connecting the second shaft and the fourth shaft. side, forming a self-locking structure.

In this embodiment, the lifting drive mechanism is composed of two symmetrically arranged sets of electric cylinders and two symmetrically arranged pairs of mechanical link mechanisms, and the two pairs of mechanism link mechanisms are respectively located on the front and rear sides of the electric cylinders.

In this embodiment, the upper core box lifting mechanism and the upper pressing head mechanism use the same set of four guide rod columns 5, which saves equipment space and facilitates maintenance operations.

This embodiment replaces the control technology of hydraulic cylinder + hydraulic valve with electric drive + servo control technology, and can realize the non-hydraulic drive design of the core making machine, avoiding a series of problems caused by the hydraulic system being greatly affected by external environmental changes. questions such as:

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

* All driving parts can meet the stop position error <±0.1mm without fixed mechanical limit;

* There is no trouble in the layout of hydraulic pipes and cleaning due to pipeline leakage;

* No loud hydraulic pump pressure noise;

In this embodiment, the self-locking connecting rod of the mechanical structure is used to replace the original large-scale hydraulic cylinder pressure-holding action, so that the mold clamping of the upper and lower core boxes is more reliable, and the output energy is more saved.

Embodiment 2: An electric drive mold-joining core making machine, the structure of the whole machine is similar to that of Embodiment 1. Among them, in the lifting mechanism of the upper core box, the four sets of gear transmission mechanisms are divided into two groups of connections, and a servo reducer is installed on both sides of the frame, and the two servo reducers are controlled by a synchronous servo controller to achieve core loading. Synchronous drive of the box lifting frame.

The rack on the four-guide rod column is a standard rack fixedly connected to one side of the column.

Claims (12)

1. An electric-driven mold closing core making machine, comprising a frame, a lower mobile trolley, an upper mobile trolley, an upper core box lifting mechanism, a sand shooting unit, and an air blowing unit, and the sand shooting unit is provided with a shooting head mechanism, The air blowing unit is provided with an air blowing and upper core mechanism, and the upper mobile trolley drives the sand shooting unit and the air blowing unit. It is characterized in that: the upper core box lifting mechanism is mainly arranged in the frame The four guide rod columns, the upper core box lifting frame, the upper core box servo motor and the synchronous mechanism respectively through the four sets of gear transmission mechanisms and the racks on the four guide rod columns; the upper pressure head mechanism is provided. The pressure head mechanism is located above the lifting mechanism of the upper core box and has a lifting drive mechanism. The lifting drive mechanism includes at least one set of electric cylinders composed of servo motors and screw rods, and at least one pair of mechanical linkages. The output acts on the upper pressure head mechanism through the mechanical link mechanism. 2. The electric drive mold closing core making machine according to claim 1, characterized in that: the mechanical linkage mechanism is composed of a three-shaft connecting piece and a connecting rod, and the three-shaft connecting piece is connected to the four guides. The first rotating shaft on the pole column or the frame, the second rotating shaft connected to the output end of the electric cylinder, the third rotating shaft connected to the connecting rod, and the other end of the connecting rod has the first rotating shaft connected to the upper pressing head mechanism. Four rotating shafts, wherein, the third rotating shaft is located below the side of the line connecting the first rotating shaft and the second rotating shaft, and at the initial position, the third rotating shaft and the first rotating shaft are located between the second rotating shaft and the second rotating shaft On both sides of the connecting line of the four rotating shafts, when pressing down to the mold clamping position, the third rotating shaft forms a straight line with the second rotating shaft and the fourth rotating shaft or is connected with the first rotating shaft at the position of the second rotating shaft and the fourth rotating shaft. The same side of the line constitutes a self-locking structure. 3. The electric drive mold closing core making machine according to claim 1, characterized in that two electric cylinders are provided in the lifting drive mechanism of the upper pressure head mechanism, and the two electric cylinders are driven synchronously Mechanical linkage on the corresponding side. 4. The core-making machine with electric drive clamping according to claim 1, characterized in that: the four corners of the upper pressing head mechanism respectively cooperate with the racks on the four guide rod columns through gears to form a guiding structure to realize synchronous movement. 5. The core-making machine of electric drive mold closing according to claim 1, characterized in that: the four corners of the upper pressure head mechanism are respectively provided with independent guide rods and guide sleeves to form a guiding structure to ensure the synchronization of the pressure head lifting and positioning. 6. The electric drive mold closing core making machine according to claim 1, characterized in that: the lifting drive mechanism is composed of two symmetrically arranged electric cylinders and two symmetrically arranged pairs of mechanical linkages, the two pairs Mechanism link mechanisms are respectively located on the front and back sides or the left and right sides of the electric cylinder. 7. The electric-drive core making machine for closing molds according to claim 1, characterized in that: in the lifting mechanism of the upper core box, four sets of gear transmission mechanisms are connected by rotating shafts and are synchronously driven by a servo reducer. 8. The electric drive core making machine according to claim 1, characterized in that: in the lifting mechanism of the upper core box, the four sets of gear transmission mechanisms are divided into two sets of connections, and a servo drive is installed on both sides of the frame. Reducer, two servo reducers control the movement through the synchronous servo controller to realize the synchronous drive to the upper core box lifting frame. 9. The core-making machine for electric-driven mold closing according to claim 1, characterized in that: the rack on the four-guide rod column is directly processed on one side of the column. 10. The core-making machine for mold closing with electric drive according to claim 1, characterized in that: the rack on the four-guide rod column is a standard rack fixedly connected to one side of the column. 11. The electric-drive core-making machine for closing molds according to claim 1, characterized in that: the lower moving trolley drives the rack and pinion through a servo reducer to move forward and backward. 12. The electric-drive core-making machine for closing molds according to claim 1, characterized in that: the upper moving trolley realizes left and right movement through a servo reducer driving a rack and pinion.