A double-layer molding machine

Abstract

The present invention relates to a double-layer molding machine, which includes a double-layer molding and forming device, a transfer device, a lifting device and an outer cover. Two layers of transfer devices are installed at upper and lower intervals on the double-layer molding and forming device, and both ends of the transfer device extend horizontally to the outside of the double-layer molding and forming device; a lifting device is respectively installed on both lateral sides of the double-layer molding and forming device; the above-mentioned double-layer molding and forming device, transfer device and lifting device are all installed inside the outer cover. The two forming units of the upper mold forming and the lower mold forming of this molding machine are stacked on top of each other, sharing main components such as the bottom beam, top beam, movable mold plate, forming guide column and lifting mechanism, with a simple and compact structure, high processing efficiency and high yield.

Description

Technical Field

[0001] The present invention belongs to the technical field of clay sand molding, and specifically relates to a double-layer molding machine. Background Art

[0002] At present, since the emergence of clay sand automatic molding technology decades ago, under the guidance of the continuously increasing demands of users, with the development and progress of technology and the continuous innovation of manufacturers, various main machines and production lines with their own characteristics have emerged. The KW line, Disa line, and Xindong line widely used at home and abroad are typical representatives among them. Among various molding machines, the vertical parting molding machine has the characteristics of no sand box and high molding efficiency. All kinds of horizontal parting boxless (stripless) molding machines are known for their simple structure, wide adaptability, and high production efficiency. In particular, the vertical sand shooting and stripping / coffering molding technology developed in China in the past two years has solved the problems of low compactness on the back of the mold and low casting yield rate easily occurring in horizontal sand shooting molding, further expanding the applicable range of boxless sand shooting molding. Multi-touch static pressure automatic molding, especially boxed multi-touch static pressure molding, is the molding method with the best product adaptability among several molding equipment, and the composition of the main machine and production line is also the most complex. Whether using quantitative sand addition or air flow sand addition, relative movement between the sand box, sand filling device, and mold is required to complete sand filling and molding. It cannot achieve sand filling, molding, and even mold clamping at a fixed station like boxless molding, and the production rate is limited. Moreover, the upper box can only be molded with the parting surface facing up and the mold is clamped by flipping at other stations. The structure of the main machine is complex and there are also many auxiliary devices. Summary of the Invention

[0003] The purpose of the present invention is to overcome the deficiencies of the prior art, combine the high efficiency of horizontal sand shooting molding, the high adaptability of multi-touch static pressure automatic molding, and the advantages of small sand-iron ratio and high casting yield rate of boxed molding, and provide a double-layer molding machine.

[0004] The present invention solves its technical problems by adopting the following technical solutions:

[0005] A double-layer molding machine, characterized in that it includes a double-layer molding and forming device, a transfer device, a lifting device, and an outer cover. Two layers of transfer devices are installed at upper and lower intervals on the double-layer molding and forming device, and both ends of the transfer device extend laterally to the outside of the double-layer molding and forming device; a lifting device is installed on each of the two lateral sides of the double-layer molding and forming device; the above-mentioned double-layer molding and forming device, transfer device, and lifting device are all installed inside the outer cover.

[0006] Moreover, the double-layer molding and forming device includes a basic frame, an upper box forming unit, and a lower box forming unit, and the upper box forming unit and the lower box forming unit are stacked and installed inside the basic frame.

[0007] Moreover, the basic framework includes a top beam, a bottom beam, forming guide columns, and a die mounting plate. The top beam and the bottom beam are arranged at intervals up and down, and forming guide columns are fixedly installed at the four corners of the top beam and the bottom beam for connection; a die mounting plate is loosely sleeved in the middle of the four forming guide columns. An upper box die is installed at the upper end of the die mounting plate, and an upper box forming unit is installed above the upper box die; a lower box die is installed at the lower end of the die mounting plate, and a lower box forming unit is installed below the lower box die; an upper sand box is arranged between the upper box die and the upper box forming unit; a lower sand box is arranged between the lower box die and the lower sand storage cylinder.

[0008] Moreover, channels for sand injection air flow and air-sand mixed fluid are made inside the die mounting plate.

[0009] Moreover, the specific structure of the upper box forming unit is as follows: a sand storage cylinder is fixedly installed at the upper part of the forming guide column, and a sand injection cylinder is connected to a sand tank installed on the top beam; an upper box forming punch is installed in the sand storage cylinder in a guiding manner, a punch adapter is fixedly installed on the upper box forming punch, an annular air channel is opened on the punch adapter, and an upper box air channel plate is installed above the annular air channel; a gate nest is installed at the lower end of the upper box forming punch; a sand dividing cone is fixedly installed in the middle of the sand storage cylinder; a sand channel opening and closing unit is driven and installed on the forming guide rod above the upper box forming punch, a group of pressure rods are fixedly installed at the lower end of the sand channel opening and closing unit, and through holes are made on the upper box forming punch at the corresponding positions of the pressure rods.

[0010] Moreover, the sand channel opening and closing unit includes an upper box pressure rod plate, four punch guide rods, and a forming guide rod frame. The four punch guide rods pass through the top beam and can move up and down. A forming guide rod frame is fixedly connected to the four punch guide rods above the top beam, and an upper box pressure rod plate is fixedly connected to the four punch guide rods below the top beam.

[0011] Moreover, the specific structure of the lower box forming unit is as follows: a lower box forming pressure rod plate is installed inside the die mounting plate, a group of lower box pressure rods are fixedly installed at the lower end of the lower box forming pressure rod plate, through holes are made at the positions of the die mounting plate opposite to the lower box pressure rods, and the lower box forming pressure rod is driven by an oil cylinder to move up and down;

[0012] A forming lower top plate is loosely sleeved at the lower part of the four forming guide columns. A forming top ring is fixedly installed at the upper end of the forming lower top plate. A lower sand storage cylinder is loosely sleeved outside the forming top ring. The lower sand storage cylinder is fixedly connected to a sand storage cylinder guide plate, and the sand storage cylinder guide plate is loosely sleeved on the four forming top ring connecting rods through guide sleeves; a forming core is sleeved inside the forming top ring, the forming core is fixedly installed on a forming core guide plate, and the forming core guide plate is loosely sleeved on the four forming top ring connecting rods.

[0013] Moreover, the transfer mechanism includes a track base, linear slide rails, sliders, a fixed frame, belt pulleys, a transmission belt, a synchronous connecting rod, and a transfer motor. Two track bases are arranged in parallel at intervals. Limit grooves are symmetrically formed on the inner sides of the two track bases, and linear slide rails are fixedly installed in the limit grooves. Sliders are installed on the linear slide rails in a guiding and sliding manner. The sliders are used to support the upper mold box or the lower mold box to be moved for movement; fixed frames are respectively installed at the upper ends of the two sides of the track bases. Two belt pulleys are installed on each fixed frame in parallel at intervals. A transmission belt is installed between the two belt pulleys on the same side of the track base. The transmission belt is connected to the corresponding slider; a synchronous connecting rod is coaxially installed at the axles of the two coaxial belt pulleys on both sides. One end of the synchronous connecting rod extends to the outside of the belt pulley and is coaxially installed with a transfer motor. The transfer motor drives the belt pulleys on both sides to rotate synchronously.

[0014] Moreover, the lifting mechanism includes a base, a flat plate, a lifting oil cylinder, and a bracket. The base is a cubic frame structure. A flat plate is fixedly installed at the upper end of the base. A lifting oil cylinder is vertically installed in the middle of the flat plate. The piston rod of the lifting oil cylinder passes through the flat plate upward and is fixedly installed with a bracket. The lifting oil cylinder drives the bracket to move up and down; vertically arranged guide rods are respectively and symmetrically installed at the lower ends of the brackets on both sides of the oil cylinder. The guide rods pass through the guide sleeves installed on the flat plate. The lower ends of the guide rods are connected to the bottom of the lifting oil cylinder through connecting plates. An optoelectronic switch is installed at the upper part of one side inside the base.

[0015] A working method of a double-layer molding machine is characterized in that the specific steps are as follows:

[0016] After the main machine is started, the lifting mechanism on the empty box side lifts the two empty sand boxes, and then the two sliding plates of the loading and unloading mechanism move to the lower part of the sand boxes driven by the motor. Then the lifting mechanism descends, and the upper sand box is hung on the upper-layer transfer device, realizing the separation of the upper box and the lower box. The lower sand box continues to descend with the lifting mechanism until it is hung on the lower-layer transfer device; the lifting mechanism descends to the bottom and waits for the next group of sand boxes to enter and be positioned.

[0017] The two transfer devices respectively move the empty upper sand box and the empty lower sand box into the molding station. The oil cylinders installed on the bottom beam respectively push the molding lower top plate, the molding top ring, the sand storage cylinder, and the molding core to rise, lift the lower sand box until the upper surface of the sand box contacts the mold parting surface; push the mold mounting plate and the upper box mold to continue rising, hold the upper sand box and move upward together until the upper surface of the upper sand box coincides with the lower surface of the sand storage cylinder. At the same time, the lower box molding pressure rod plate drives the lower box pressure rod to rise to a fixed position under the push of the oil cylinder. The sand shooting channel on the mold mounting plate is opened. The lower box mold, the mold fixing plate, the lower sand box, the molding top ring, the lower sand storage cylinder, and the molding core jointly form a closed space for the lower box; at the same time, the pressure rod also rises to a fixed position driven by the oil cylinder. The sand shooting channel on the upper box molding pressure head is opened. The upper box mold, the sand shooting fluid channel assembly, the upper sand box, the sand storage cylinder, the upper box molding pressure head, and the gate socket jointly form a closed space for the upper box.

[0018] Then, the transfer slide of the transfer mechanism retracts to the middle position, waiting for the next group of empty boxes to rise; after the just-fed empty boxes are boxed and sand-slinged, the molding cylinders installed on the top beam and the bottom beam and the cylinders simultaneously extrude to complete the upper and lower mold molding.

[0019] After molding is completed, the next group of empty sand boxes rise, the loading and unloading mechanism returns to the original position to catch the empty boxes, the cylinder on the top beam drives the upper mold forming head and the like to rise to realize the demolding of the upper mold, the cylinder on the top beam descends, driving the lower mold, the lower sand box, the forming top ring, the sand storage cylinder and the forming core to descend, and the upper mold box and the sand-slinging fluid channel assembly also descend accordingly. The upper mold box is first caught by the upper slide of the mold box loading and unloading mechanism, and then the lower mold box falls onto the lower slide of the mold box removal mechanism. The transfer mechanism removes the mold box and sends the next group of empty boxes to the molding station at the same time.

[0020] After the loading and unloading mechanism removes the mold box, the lifting mechanism on the side of the mold box rises to catch the lower box first, waits for the core to be placed in the lower box and then continues to rise. The upper mold box and the lower mold box are closed and separated from the loading and unloading mechanism. The transfer mechanism retracts to the middle position, and the mold box falls with the lifting mechanism, ending a molding cycle.

[0021] The advantages and positive effects of the present invention are:

[0022] 1. The upper mold forming and lower mold forming of this molding machine are stacked vertically, sharing main components such as the bottom beam, the top beam, the movable mold plate, the forming guide post and the lifting mechanism, etc., with a simple and compact structure.

[0023] 2. This molding machine completes sand-slinging, molding and demolding at the same station. The sand adding system and the sand box do not interfere with each other, and the mold can be pressed after sand-slinging.

[0024] 3. This molding machine pre-compacts the sand during sand-slinging and filling, with a fast sand filling speed, high production efficiency, the thickness of the sand mold can be adjusted according to needs, less sand is used, and the molding is beautiful.

[0025] 4. The core can be placed in the lower mold before closing the mold, which does not occupy the running time of the main machine, is easy to operate, and does not affect the running speed of the main machine.

[0026] 5. When this molding machine sands, the height position of the upper mold forming head can be adjusted through the touch screen of the PLC control system, and the relative heights of the sand storage cylinder, the forming top ring and the forming core can also be adjusted, so as to change the amount of sand added and the local sand adding ratio, making the compression ratio of the molding sand in each area similar, the molding hardness uniform, and the hardness after actual molding similar, adapting to different product requirements. There is no need to scrape the sand before and after molding, and there is no scattered sand.

[0027] 6. The sand shooting fluid channel (die mounting plate) of this molding machine is a specially designed component, which mainly consists of two spaces in the plate. The upper sand shooting fluid channel is in the middle, and the upper and lower sides are die fixing plates. The upper box die is installed and fixed on the upper layer, and the lower box die is installed and fixed on the lower layer. A sand shooting flow channel and an auxiliary sand shooting air flow channel are formed among the three. There is a lower box forming pressure rod plate in the auxiliary sand shooting air flow channel of the sand shooting fluid channel component. A group of pressure rods are fixed on the pressure rod plate, and the pressure rods are facing the through holes of the sand shooting fluid channel component. The lower box forming pressure rod plate is fixed to the oil cylinder rod and can move up and down driven by the oil cylinder.

[0028] 7. Both the upper and lower boxes of this molding machine have auxiliary air channels for sand shooting. When sand shooting, the auxiliary air flow sprays out from the auxiliary air channel through the gaps around the pressure rods, pushing the sand flow to change direction, so that the molding sand is redistributed in the sand box, making the hardness of each area of the sand box uniform.

[0029] 8. The forming unit of this molding machine is of the structure of a four-column press. Each action is controlled by an independent oil cylinder, and the pressure, speed and starting position are convenient to adjust. The structure is simple, stable and reliable.

[0030] 9. The upper box forming pressure head of this molding machine is equipped with a gate nest and an air hole needle. There are gate rods and riser rods on the die, and the gate, riser and vent hole are formed at one time.

[0031] 10. This molding machine is provided with an independent circulation program, and the mold box can circulate independently, enabling molding during the day and casting at night, which is convenient for production organization and management, and maximizes the enterprise benefits. Description of the Drawings

[0032] Figure 1 is the general assembly drawing of the double-layer molding machine of the present invention;

[0033] Figure 2 is Figure 1 the sectional view taken along the A-A direction in

[0034] Figure 3 is Figure 1 the top view of

[0035] Figure 4 is the structural schematic diagram of the double-layer molding forming device;

[0036] Figure 5 is Figure 4 the right view of

[0037] Figure 6 is Figure 5 the sectional view taken along the B-B direction of

[0038] Figure 7 is the front view of the structure of the transfer mechanism;

[0039] Figure 8 is Figure 7 the left view of

[0040] Figure 9 Schematic three-dimensional structure diagram of the transfer mechanism;

[0041] Figure 10 Schematic diagram of the lifting mechanism;

[0042] Figure 11 is Figure 10 mid-sectional schematic diagram of;

[0043] Figure 12 Schematic structure diagram of the mold mounting plate;

[0044] Figure 13 is Figure 12 mid-sectional top view of (including the sand injection fluid channel).

[0045] Reference numerals: 1 forming guide pillar, 2 upper sand box, 3 pressure rod oil cylinder, 4 sand storage cylinder, 5 upper box forming pressure head, 6 upper box sand tank, 7 upper box pressure rod plate, 8 pressure rod, 9 pressure head guide rod, 10 gate socket, 11 sand dividing cone, 12 pressure head adapter, 13 upper box air duct plate, 14 top beam, 15 upper box mold, 16 forming guide rod frame, 17 bottom beam, 18 lifting device, 19 oil cylinder ball socket, 20 transfer device, 21 lower sand storage cylinder, 25 lower box mold, 26 lower sand box, 27 forming core, 28 forming top ring, 29 forming lower top plate, 30 forming core guide plate, 31 sand storage cylinder guide plate, 32 sand storage cylinder connecting rod, 33 forming core connecting rod, 34 forming top ring connecting rod, 36 common mold bottom plate, 37 lower box forming pressure rod plate, 38 oil cylinder, 39 mold mounting plate (sand injection fluid channel assembly), 40 lower box pressure rod;

[0046] 181 base, 182 photoelectric switch, 183 bracket, 184 guide rod, 185 flat plate, 186 lifting oil cylinder, 187 connecting plate, 188 guide sleeve; 201 transfer motor, 202 belt pulley, 203 transmission belt, 204 synchronous connecting rod, 205 fixing frame, 206 linear slide rail, 207 track seat, 208 slider, 209 fixing block. Detailed implementation manners

[0047] The present invention will be further described in detail below in conjunction with the accompanying drawings and through specific embodiments. The following embodiments are only descriptive and not restrictive, and the protection scope of the present invention cannot be limited thereby.

[0048] A double-layer molding machine includes a double-layer molding and forming device, a transfer device 20, a lifting device 18, and an outer cover (not shown in the figure). Two layers of transfer devices are installed at upper and lower intervals on the double-layer molding and forming device, and both ends of the transfer device extend laterally to the outside of the double-layer molding and forming device; a lifting device is installed on each of the two lateral sides of the double-layer molding and forming device; the above-mentioned double-layer molding and forming device, transfer device, and lifting device are all installed inside the outer cover.

[0049] The double-layer shaping device is the core of the molding machine. It adopts the structure of a four-column press and includes a basic frame, an upper mold shaping unit, and a lower mold shaping unit. The upper mold shaping unit and the lower mold shaping unit are stacked and installed in the basic frame.

[0050] The basic frame includes a top beam 14, a bottom beam 17, and forming guide columns 1. The top beam and the bottom beam are arranged at intervals up and down, and forming guide columns are fixedly installed at the four corners of the top beam and the bottom beam for connection.

[0051] A mold mounting plate 39 is sleeved in the middle of the four forming guide columns. Channels for sand injection air flow and air-sand mixed fluid are made in the mold mounting plate. An upper mold 15 is installed at the upper end of the mold mounting plate, and an upper mold shaping unit is installed above the upper mold; a lower mold 25 is installed at the lower end of the mold mounting plate, and a lower mold shaping unit is installed below the lower mold. The mold mounting plate 39 is a specially designed component (see Figure 12 、 13 ). It is mainly composed of three plates and two spaces. There is a middle upper sand injection fluid channel, and the upper and lower sides are mold fixing plates. The upper mold is installed and fixed on the upper layer, and the lower mold is installed and fixed on the lower layer. A sand injection flow channel and an auxiliary sand injection air flow channel are formed among the three.

[0052] The specific structure of the upper mold shaping unit is as follows: A sand storage cylinder 4 is fixedly installed on the upper part of the forming guide column. The sand injection cylinder is connected to a sand tank 6 installed on the top beam; An upper mold shaping punch 5 is installed in the sand storage cylinder in a guiding manner. A punch adapter 12 is fixedly installed on the upper mold shaping punch. An annular air channel is opened on the punch adapter, and an upper mold air channel plate 13 is installed above the annular air channel; A gate socket 10 is installed at the lower end of the upper mold shaping punch; A sand dividing cone 11 is fixedly installed in the middle of the sand storage cylinder.

[0053] A sand channel opening and closing unit is installed on the forming guide rod above the upper mold shaping punch in a driving manner. A group of pressure rods 8 are fixedly installed at the lower end of the sand channel opening and closing unit. Through holes are made on the upper mold shaping punch 5 at the corresponding positions of the pressure rods so that the pressure rods can pass through.

[0054] The sand channel opening and closing unit includes an upper mold pressure rod plate 7, four punch guide rods 9, and a forming guide rod frame 16. The four punch guide rods pass through the top beam and can move up and down. A forming guide rod frame is fixedly connected to the four punch guide rods above the top beam, and an upper mold pressure rod plate is fixedly connected to the four punch guide rods below the top beam. An upper sand box 2 is arranged between the upper mold and the upper mold shaping unit.

[0055] The specific structure of the lower mold shaping unit is as follows: A lower mold shaping pressure rod plate 37 is installed in the mold mounting plate. A group of lower mold pressure rods 40 are fixedly installed at the lower end of the lower mold shaping pressure rod plate. Through holes are made at the positions of the mold mounting plate opposite to the lower mold pressure rods. The lower mold shaping pressure rod 37 is connected to an oil cylinder 38, and the oil cylinder drives the lower mold shaping pressure rod to move up and down.

[0056] A forming lower top plate 29 is sleeved and installed at the lower part of four forming guide posts. The upper end of the forming lower top plate is fixedly installed with a forming top ring 28 through four forming top ring connecting rods 34. A lower sand storage cylinder 21 is sleeved outside the forming top ring. The lower sand storage cylinder is fixedly connected with a sand storage cylinder guide plate 31 through four sand storage cylinder connecting rods 32. The sand storage cylinder guide plate is sleeved and installed on the four forming top ring connecting rods 34 through a guide sleeve and can move up and down. A forming middle core 27 is sleeved inside the forming top ring 28. The forming middle core is fixedly installed on a forming middle core guide plate 30. The forming middle core guide plate is sleeved and installed on the four forming top ring connecting rods. A lower sand box 26 is arranged between the lower box mold and the lower sand storage cylinder.

[0057] The transfer mechanism includes a track seat 207, a linear slide rail 206, a slider 208, a fixed frame 205, a belt pulley 202, a transmission belt 203, a synchronous connecting rod 204 and a transfer motor 201. The two track seats are arranged in parallel at intervals. Limit grooves are symmetrically formed on the inner sides of the two track seats, and linear slide rails are fixedly installed in the limit grooves. A slider is installed on the linear slide rail in a guiding and sliding manner. The slider is used to support the upper mold box or the lower mold box to be moved for movement. Fixed frames are respectively installed at the upper ends of the two sides of the track seats. Two belt pulleys are installed on each fixed frame in parallel at intervals. A transmission belt is installed between the two belt pulleys on the same side of the track seat. The transmission belt is connected to the corresponding slider. A synchronous connecting rod is coaxially installed at the axes of the two belt pulleys on both sides. One end of the synchronous connecting rod extends to the outside of the belt pulley and is coaxially installed with a transfer motor. The transfer motor drives the belt pulleys on both sides to rotate synchronously.

[0058] The lifting mechanism includes a base 181, a flat plate 185, a lifting oil cylinder 186 and a bracket 183. The base is a cubic frame structure. A flat plate is fixedly installed at the upper end of the base. A lifting oil cylinder is vertically installed in the middle of the flat plate. The piston rod of the lifting oil cylinder passes through the flat plate upward and is fixedly installed with a bracket. The lifting oil cylinder drives the bracket to move up and down.

[0059] Vertically arranged guide rods 184 are respectively and symmetrically installed at the lower ends of the brackets on both sides of the oil cylinder. The guide rods pass through guide sleeves 188 installed on the flat plate. The lower ends of the guide rods are connected to the bottom of the lifting oil cylinder through connecting plates 187 to ensure that the guide rods and the lifting oil cylinder move up and down synchronously. An optoelectronic switch 182 is installed at the upper part of one side inside the base to accurately detect the lifting height of the support plate.

[0060] A working method of a double-layer molding machine, the specific steps are as follows:

[0061] After the main machine is started, the lifting mechanism on the empty box side lifts the two empty sand boxes, and then the two sliding plates of the loading and unloading mechanism move to the lower part of the sand boxes driven by the motor. Then the lifting mechanism descends. The upper sand box 2 is hung on the upper-layer transfer sliding plate, realizing the separation of the upper box and the lower box. The lower sand box 26 continues to descend with the lifting mechanism until it is hung on the lower-layer transfer sliding plate of the transfer device. The lifting mechanism descends to the bottom and waits for the next group of sand boxes to enter and be positioned;

[0062] The transfer device moves the empty upper sand box 2 and the empty lower sand box 26 into the molding station respectively. The three groups of oil cylinders (not shown in the figure) installed on the bottom beam 17 respectively push the molding lower top plate 29, the molding top ring 28, the sand storage tube 4 and the molding core 27 to rise, and lift the lower sand box 26 until the upper surface of the sand box contacts the parting surface of the mold 25, and push the sand shooting fluid channel assembly 39 and the upper box mold 15 to continue to rise, and hold the upper sand box 2 to move upward together until the upper surface of the upper sand box 2 coincides with the lower surface of the sand storage tube 4. At the same time, the lower box molding pressure rod plate 37 is moved by the oil cylinder 3 8 pushes the lower belt lower box pressure rod 40 to rise to a fixed position, the sand shooting channel on the sand shooting fluid channel assembly 38 is opened, and the lower box mold 25, the mold fixing plate 39, the lower sand box 26, the molding top ring 28 and the sand storage cylinder 4 and the molding core 27 together form a closed space of the lower box; at the same time, the pressure rod 8 is also driven by the oil cylinder to rise to a fixed position, the sand shooting channel on the upper box molding pressure head 5 is opened, and the upper box mold 15, the sand shooting fluid channel assembly 39, the upper sand box 2, the sand storage cylinder 4, the upper box molding pressure head 5 and the gate nest 10 together form a closed space of the upper box;

[0063] Then, the transfer slide of the transfer mechanism returns to the middle position, waiting for the next group of empty boxes to rise. After the empty boxes just delivered are closed and sandblasted, the forming cylinders and cylinders 38 installed on the top beam 14 and the bottom beam 17 simultaneously squeeze to complete the upper and lower molding;

[0064] After the molding is completed, the next group of empty sand boxes are raised, and the loading and unloading mechanism returns to the original position to receive the empty boxes. The oil cylinder on the top beam 14 drives the upper box molding pressure head 5 to rise to realize the upper mold demoulding. The oil cylinder on the top beam descends, driving the lower box mold 15, the lower sand box 26, the molding top ring 28, the sand storage cylinder 4 and the molding core 27 to descend, and the upper mold box 2 and the sand shooting fluid channel assembly 39 also descend accordingly. The upper mold box 2 is first received by the upper slide of the mold box loading and unloading mechanism, and then the lower mold box 26 falls on the lower slide of the mold box removal mechanism. The transfer mechanism moves the mold box out and sends the next group of empty boxes to the molding station at the same time;

[0065] After the loading and unloading mechanism moves the mold box out, the lifting mechanism on the mold box side rises to catch the lower box first, waits for the lower box to put the core and then continues to rise. The upper mold box is molded with the lower box and separated from the loading and unloading mechanism. The transfer mechanism returns to the middle position, and the mold box falls with the lifting mechanism, and a molding cycle ends.

[0066] Although the embodiments and drawings of the present invention are disclosed for illustrative purposes, those skilled in the art will appreciate that various substitutions, changes and modifications are possible without departing from the spirit and scope of the present invention and the appended claims. Therefore, the scope of the present invention is not limited to the contents disclosed in the embodiments and drawings.

Claims

1. A working method of a double-layer molding machine, characterized in that: The double-layer molding machine includes a double-layer molding and forming device, a transfer device, a lifting device, and an outer cover. Two layers of transfer devices are installed at upper and lower intervals on the double-layer molding and forming device, and both ends of the transfer device extend laterally to the outside of the double-layer molding and forming device; a lifting device is installed on each of the two lateral sides of the double-layer molding and forming device; the above-mentioned double-layer molding and forming device, transfer device, and lifting device are all installed inside the outer cover; The double-layer molding and forming device includes a basic frame, an upper mold box forming unit, and a lower mold box forming unit. The upper mold box forming unit and the lower mold box forming unit are stacked and installed inside the basic frame; The basic frame includes a top beam, a bottom beam, forming guide columns, and a mold mounting plate. The top beam and the bottom beam are arranged at upper and lower intervals, and forming guide columns are fixedly installed at the four corners of the top beam and the bottom beam for connection; a mold mounting plate is loosely sleeved in the middle of the four forming guide columns. An upper mold box is installed at the upper end of the mold mounting plate, and an upper mold box forming unit is installed above the upper mold box; a lower mold box is installed at the lower end of the mold mounting plate, and a lower mold box forming unit is installed below the lower mold box; an upper sand box is arranged between the upper mold box and the upper mold box forming unit; The specific structure of the lower mold box forming unit is as follows: a lower mold box forming pressure bar plate is installed inside the mold mounting plate, and a group of lower mold box pressure bars are fixedly installed at the lower end of the lower mold box forming pressure bar plate. A through hole is made at the position of the mold mounting plate opposite to the lower mold box pressure bars. The lower mold box forming pressure bar plate is driven by an oil cylinder to move up and down; A forming lower top plate is loosely sleeved at the lower part of the four forming guide columns. A forming top ring is fixedly installed at the upper end of the forming lower top plate. A lower sand storage cylinder is loosely sleeved outside the forming top ring. The lower sand storage cylinder is fixedly connected to a sand storage cylinder guide plate. The sand storage cylinder guide plate is loosely sleeved on the four forming top ring connecting rods through guide sleeves; a forming middle core is sleeved inside the forming top ring. The forming middle core is fixedly installed on a forming middle core guide plate. The forming middle core guide plate is loosely sleeved on the four forming top ring connecting rods; A lower sand box is arranged between the lower mold box and the lower sand storage cylinder; The specific structure of the upper mold box forming unit is as follows: a sand storage cylinder is fixedly installed at the upper part of the forming guide columns. A sand injection cylinder is connected to a sand tank installed on the top beam; an upper mold box forming pressure head is installed inside the sand storage cylinder in a guiding manner. A pressure head adapter is fixedly installed on the upper mold box forming pressure head. An annular air passage is opened on the pressure head adapter, and an upper mold box air passage plate is installed above the annular air passage; a gate socket is installed at the lower end of the upper mold box forming pressure head; a sand dividing cone is fixedly installed in the middle of the sand storage cylinder; a sand passage opening and closing unit is installed above the upper mold box forming pressure head in a driving manner. A group of pressure bars are fixedly installed at the lower end of the sand passage opening and closing unit. Through holes are made on the upper mold box forming pressure head at the corresponding positions of the pressure bars; The specific steps are as follows: After the main machine is started, the lifting mechanism on the empty box side lifts the two empty sand boxes, and then the two sliders of the transfer device move to the lower part of the sand boxes under the drive of the motor. Then the lifting mechanism descends, and the upper sand box is hung on the upper-layer transfer device, realizing the separation of the upper mold box and the lower mold box. The lower sand box continues to descend with the lifting mechanism until it is hung on the lower-layer transfer device; The lifting mechanism descends to the bottom and waits for the next group of sand boxes to enter and be positioned; Two transfer devices respectively move an empty upper sand box and an empty lower sand box into the molding station. The oil cylinders installed on the bottom beam respectively push the lower molding top plate, the molding top ring, the lower sand storage cylinder and the molding core to rise, lift the lower sand box until the upper surface of the lower sand box contacts the mold parting surface; then push the mold mounting plate and the upper box mold to continue rising, hold the upper sand box and move upward together until the upper surface of the upper sand box coincides with the lower surface of the sand storage cylinder. At the same time, the lower box molding pressure bar plate drives the lower box pressure bar to rise to a fixed position under the push of the oil cylinder, and the sand injection channel on the mold mounting plate is opened. The lower box mold, the mold mounting plate, the lower sand box, the molding top ring, the lower sand storage cylinder and the molding core together form a closed space for the lower box; at the same time, the pressure bar also rises to a fixed position driven by the oil cylinder, and the sand injection channel on the upper box molding pressure head is opened. The upper box mold, the mold mounting plate, the upper sand box, the sand storage cylinder, the upper box molding pressure head and the gate socket together form a closed space for the upper box. Then, the slider of the transfer device retracts to the middle position and waits for the next group of empty boxes to rise; after the just-fed empty boxes are closed and sand-injected, the molding oil cylinders and the oil cylinders installed on the top beam and the bottom beam simultaneously extrude to complete the upper and lower mold shaping. After the shaping is completed, when the next group of empty sand boxes rise, the transfer device returns to the original position to catch the empty boxes. The molding oil cylinder on the top beam drives the upper box molding pressure head to rise to realize the demolding of the upper mold. The oil cylinder on the bottom beam descends, driving the lower box mold, the lower sand box, the molding top ring, the lower sand storage cylinder and the molding core to descend. The upper sand box and the mold mounting plate also descend accordingly. The upper sand box is first caught by the upper layer slider of the transfer device, and then the lower sand box falls onto the lower layer slider of the transfer device. The transfer device moves the mold box out and sends the next group of empty boxes to the molding station at the same time. After the transfer device moves the mold box out, the lifting mechanism on the side of the mold box rises to catch the lower sand box first, waits for the lower sand box to be placed with the core and then continues to rise. The upper sand box is closed with the lower sand box and disengages from the transfer device. The transfer device retracts to the middle position, and the mold box falls with the lifting mechanism, ending a molding cycle.

2. The working method of the double-layer molding machine according to claim 1, characterized in that: The mold mounting plate is internally provided with channels for sand injection air flow and air-sand mixed fluid.

3. The working method of the double-layer molding machine according to claim 1, characterized in that: The sand channel opening and closing unit includes an upper box pressure bar plate, four pressure head guide rods and a molding guide column frame. The four pressure head guide rods pass through the top beam and can move up and down. A molding guide column frame is fixedly connected to the four pressure head guide rods above the top beam, and an upper box pressure bar plate is fixedly connected to the four pressure head guide rods below the top beam.

4. The working method of the double-layer molding machine according to claim 1, characterized in that: The transfer device includes a track seat, a linear slide rail, a slider, a fixed frame, a belt pulley, a transmission belt, a synchronous connecting rod and a transfer motor. Two track seats are arranged in parallel at intervals. Limiting grooves are symmetrically made on the inner sides of the two track seats, and linear slide rails are fixedly installed in the limiting grooves. The linear slide rails are slidably installed with sliders for guiding. The sliders are used to support the upper sand box or the lower sand box to be moved for movement; fixed frames are respectively installed at the upper ends of the two sides of the track seats, and two belt pulleys are installed in parallel at intervals on each fixed frame. A transmission belt is installed between the two belt pulleys on the same side of the track seat, and the transmission belt is connected to the corresponding slider; a synchronous connecting rod is coaxially installed at the axis of the two belt pulleys on both sides. One end of the synchronous connecting rod extends to the outside of the belt pulley and is coaxially installed with a transfer motor, and the transfer motor drives the belt pulleys on both sides to rotate synchronously.

5. The working method of the double-layer molding machine according to claim 1, characterized in that: The lifting mechanism includes a base, a flat plate, a lifting oil cylinder and a bracket. The base is a cubic frame structure. A flat plate is fixedly installed at the upper end of the base. A lifting oil cylinder is vertically installed in the middle of the flat plate. The piston rod of the lifting oil cylinder passes through the flat plate upward and is fixedly installed with a bracket. The lifting oil cylinder drives the bracket to move up and down. On both sides of the lifting oil cylinder, a vertical guide rod is symmetrically installed at the lower end of the bracket. The guide rod passes through a guide sleeve installed on the flat plate. The lower end of the guide rod is connected to the bottom of the lifting oil cylinder through a connecting plate. An optoelectronic switch is installed at the upper part of one side inside the base.

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