Automatic box locking device and method for iron mold sand-covered casting pouring trolley

Abstract

The present invention relates to an automatic box locking device and method for a casting trolley for iron mold sand coating, and belongs to the field of machinery. The automatic box locking device of the present invention comprises an upper beam, a column, a lifting hydraulic cylinder, a lifting movable beam, and a plurality of box card locking and tightening devices. The upper part of the column is fixed to the upper beam, the lifting hydraulic cylinder is fixed to the upper beam, and a plurality of box card locking and tightening devices are all installed on the lifting movable beam, and the piston rod of the lifting hydraulic cylinder is connected to the lifting movable beam; the box card locking and tightening device comprises a pneumatic rotary motor, a fork-type locking rotating head, and a plurality of float automatic alignment devices. The plurality of float automatic alignment devices are all connected to the lifting movable beam, and a fork-type locking rotating head is installed on the output shaft of the pneumatic rotary motor. The structural design of the present invention is simple and reasonable, safe and reliable, low in cost, and easy to maintain. It can automatically lock the box card on the casting trolley, meeting the operation requirements of the mechanized and automated iron mold sand coating casting production line and meeting the use requirements.

Description

Technical Field

[0001] The invention relates to a device and a method, in particular to an automatic box locking device and method for a casting trolley for iron mold sand coating casting. The automatic box locking device is used for locking / loosening the box of the casting trolley and belongs to the field of machinery. Background Art

[0002] As a green, efficient and energy-saving casting production technology, iron mold sand casting has become one of the typical production processes for producing high-quality castings and has been widely used in China. When iron mold sand casting is used in the production of ductile iron castings, it can make full use of the graphitization expansion characteristics of ductile iron during the solidification process to achieve riser-free casting to obtain casting products with dense internal structure. In the production of iron mold sand casting, the upper and lower iron molds must be locked with box clamps during the pouring of molten iron and the subsequent solidification and cooling of the castings after the upper and lower iron molds are closed to prevent the molten iron from leaking from the closing parting surface of the upper and lower iron molds during the pouring process and the subsequent solidification and cooling process. For mechanized and automated iron mold sand casting production lines, how to realize the automatic locking and opening of the iron mold closing box clamps has become one of the bottlenecks for the realization of automated and mechanized production of iron mold sand casting production lines.

[0003] Especially in the iron mold sand-coated casting production line using the pouring trolley method, the automatic locking of the box card is of great significance for reducing the number of operators, alleviating the labor intensity of operators, saving production costs, improving the automation level of the production line, and further promoting the iron mold sand-coated casting technology.

[0004] A Chinese patent with a publication date of July 24, 2013 and a publication number of 203076567U discloses a utility model patent entitled "A pouring trolley". The patent has a flat plate on the top, and two front wheels and two rear wheels are arranged below the flat plate, and the distance between the two front wheels is equal to the distance between the two rear wheels. The flat plate on the top of the patent is convenient for placing sand boxes, which is suitable for carrying sand boxes in automatic pouring production, and is both safe and efficient. However, the sand boxes are moved to the pouring trolley, and the sand boxes are locked. It takes a lot of effort to move the boxes, which is completely done manually, so it still has the above-mentioned defects.

[0005] Therefore, it is particularly necessary to provide an automatic box locking device for a casting trolley which has a simple and reasonable structural design, can automatically lock the box card on the casting trolley, and has a high degree of mechanization and automation. Summary of the invention

[0006] The purpose of the present invention is to overcome the above-mentioned shortcomings in the prior art and to provide an automatic box locking device and method for an iron mold sand-covered casting casting trolley which has a simple and reasonable structural design, is safe and reliable, has low cost, is easy to maintain, and can automatically lock the box card on the casting trolley to meet the operation requirements of a mechanized and automated iron mold sand-covered casting production line.

[0007] The technical solution adopted by the present invention to solve the above-mentioned problem is: the automatic box locking device for the iron mold sand-coated casting pouring trolley comprises an upper beam, a column and a lifting hydraulic cylinder, the upper part of the column is fixed to the upper beam, the column is arranged on the ground on both sides of the pouring trolley, and the lifting hydraulic cylinder is fixed on the upper beam, characterized in that it also comprises a lifting movable beam and a plurality of box card locking and tightening devices, the plurality of box card locking and tightening devices are all installed on the lifting movable beam, and the piston rod of the lifting hydraulic cylinder is connected to the lifting movable beam; the box card locking and tightening device comprises an air rotary motor, a fork-type locking rotating head and a plurality of floating ball automatic alignment devices, the plurality of floating ball automatic alignment devices are all connected to the lifting movable beam, and the output shaft of the air rotary motor is equipped with a fork-type locking rotating head; the plurality of floating ball automatic alignment devices all comprise floating steel balls, an air motor fixing plate and a floating device bottom plate, four floating steel balls are arranged in each floating ball automatic alignment device, the floating device bottom plate is installed on the lifting movable beam, and the air motor fixing plate is connected to the fixed installation mechanism at the lower part of the box card locking and tightening device.

[0008] Preferably, the present invention further comprises a trolley box card closing guide plate, wherein the trolley box card closing guide plates are two in number and the two trolley box card closing guide plates are respectively mounted on the two side columns.

[0009] Preferably, the present invention also includes four lifting guide rods. The lifting movable beam is equipped with four lifting guide rods, and the lifting guide rods slide up and down in the guide sleeve holes on the upper beam as the lifting movable beam lifts and lowers; the lifting movable beam is lifted and lowered smoothly, and at the same time, the lifting movable beam is ensured not to twist when the box card locking and tightening device performs the box card locking work.

[0010] Preferably, the present invention comprises four box card locking and tightening devices, which are all installed on the lifting beam, and the positions of the four box card locking and tightening devices correspond to the positions of the four box cards on the casting trolley.

[0011] Preferably, the locking box card closing guide plate, the column and the upper beam of the present invention adopt an integral frame structure.

[0012] Preferably, the lifting movable beam equipped with the box card locking and tightening device of the present invention moves with the lifting and lowering of the lifting hydraulic cylinder.

[0013] Preferably, the fork-type locking rotating head of the present invention is provided with two fork straight rods, and the two fork straight rods are round rod structures, and the heads of the round rod structures are spherical rods with a certain taper.

[0014] Preferably, the floating range of the float automatic alignment device of the present invention is within a radius of 12 mm.

[0015] Preferably, the distance L>b+20mm from the bottom of the round rod head of the fork-type locking rotating head in the box card locking and tightening device of the present invention to the upper plane of the trolley box card, where b represents the distance from the lower plane of the lower iron running edge to the upper plane of the protrusion at the lower end of the trolley box card; to ensure that during the locking process of the box card, the bottom of the locking fork frame will not touch the upper plane of the box card, causing the locking frame to be blocked and stop rotating, resulting in the inability to lock the box card.

[0016] The present invention also provides a working method of an automatic box locking device for a pouring trolley for iron mold covered sand casting, which is characterized by the following steps: in the pouring section of the iron sand production line, the pouring trolleys are connected one by one in a row and conveyed by pulsating push; the self-contained box card-type pouring trolley carrying upper and lower iron molds on the pouring section moves along the running direction of the pouring trolley in the pouring section under the action of the trolley pusher system, and each time it moves, it conveys a distance of a trolley length, and the trolley gradually enters the upper and lower iron molds to automatically close the box lock At the box device station, as the pouring trolley moves forward, the push wheels on the push rods of the box card devices on both sides of the pouring trolley come into contact with the box card closing guide plates of the trolley. Under the action of the box card closing guide plates of the trolley, the push wheels gradually move closer to the center line of the trolley, driving the box card on the pouring trolley to gradually close to the center line of the trolley until the box card on the pouring trolley is completely closed, so that the box card locking mechanism of the trolley is in the box closing and locking working position, the pouring trolley stops moving, and then the upper and lower iron molds are started to be closed and locked at this position; lifting hydraulic cylinder The lifting moving beam that drives the box card locking and tightening device to start to descend. As the lifting hydraulic cylinder descends, the fork-type locking rotating head of the box card locking and tightening device descends accordingly. After hitting the horizontal round rod of the locking screw head of the trolley box card, the two round rods of the fork-type locking rotating head can automatically insert into the empty spaces on both sides of the rotating horizontal round rod of the locking screw of the trolley box card. The hydraulic cylinder continues to descend for a certain distance and then stops. The distance L from the bottom of the round rod head of the fork-type locking rotating head to the upper plane of the trolley box card is greater than b+20mm, where b represents the lower iron type running The distance from the lower plane of the edge to the upper plane of the protrusion at the lower end of the trolley box card; then compressed air is introduced to make the pneumatic motor rotate. With the rotation of the pneumatic motor, the fork-type locking rotating head drives the box card locking screw to rotate to lock the upper and lower iron molds; after the iron mold is locked, the casting trolley, under the action of the trolley pushing system, pushes the locked casting trolley away from the iron mold box closing and locking station, and at the same time pushes the next trolley that needs to be locked into the iron mold box closing and locking station; the trolley after the iron mold is locked enters the molten iron pouring section for pouring molten iron.

[0017] Compared with the prior art, the present invention has the following advantages and effects: (1) the overall structural design is simple and reasonable, the manufacturing cost is low, and the maintenance is convenient; the box card locking device is arranged on the iron mold sand coating casting production line to complete the automatic locking of the upper and lower iron molds on the casting trolley with the box card locking device after the boxes are closed, which is easy to realize the mechanization and automation of the production process; (2) the original process requires high labor intensity of workers to operate; improve the mechanization and automation level of the iron mold sand coating casting production line; (3) the synchronous locking of the four box cards is realized, and the locking force is basically the same, which greatly reduces the generation of casting waste caused by improper closing and locking operation, and improves the finished product rate of casting production. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a side structural schematic diagram of the automatic box locking device according to an embodiment of the present invention.

[0019] Figure 2 It is a schematic diagram of the main structure of the automatic box locking device according to an embodiment of the present invention.

[0020] Figure 3 It is a schematic diagram of the top view of the automatic box locking device according to an embodiment of the present invention.

[0021] Figure 4 It is a structural schematic diagram of a box card locking and tightening device in an automatic box locking device according to an embodiment of the present invention.

[0022] Figure 5 The structure of the automatic float alignment device in the box card locking and tightening device of the embodiment of the present invention is shown in FIG. Figure 1 .

[0023] Figure 6 The structure of the automatic float alignment device in the box card locking and tightening device of the embodiment of the present invention is shown in FIG. Figure 2 .

[0024] Figure 7 It is a structural schematic diagram of a fork-type locking rotating head in a box card locking and tightening device according to an embodiment of the present invention.

[0025] Figure 8 This is a schematic diagram of the initial position of the automatic lock box device according to the embodiment of the present invention. Figure 1 .

[0026] Fig. 9 This is a schematic diagram of the initial position of the automatic lock box device according to the embodiment of the present invention. Figure 2 .

[0027] Fig.10 The invention is a schematic diagram of the working state of the automatic box locking device of the present invention. Figure 1 .

[0028] Fig.11 The invention is a schematic diagram of the working state of the automatic box locking device of the present invention. Figure 2 .

[0029] Fig.12 It is a schematic diagram of the operation of the box card locking and tightening device descending in the automatic box locking device according to an embodiment of the present invention.

[0030] Fig.13 yes Fig.12 Schematic diagram of the local enlarged structure at point A in the middle.

[0031] Fig.14 It is a schematic diagram of the operation of the locking iron mold in the automatic box locking device according to an embodiment of the present invention.

[0032] Fig.15 The present invention is an embodiment of the automatic box locking device in the box card locking device of the embodiment of the present invention. Figure 1 .

[0033] Fig.16 The present invention is an embodiment of the automatic box locking device in the box card locking device of the embodiment of the present invention. Figure 2 .

[0034] Fig.17 It is a working schematic diagram of the locking device for moving the pouring trolley out of the box in the automatic box locking device according to an embodiment of the present invention.

[0035] In the figure: the trolley box card closing guide plate 1, the upper beam 2, the lifting hydraulic cylinder 3, the box card locking and tightening device 4, the lifting moving beam 5, the column 6, the lifting guide rod 7; the pneumatic rotary motor 41, the fork frame locking rotary head 42, the floating ball automatic alignment device 43, the output shaft 411 of the pneumatic rotary motor 41; the fork frame straight rod 421, the round ball rod 422, the connecting flange 423; the floating steel ball 431, the pneumatic motor fixing plate 432, the floating device bottom plate 433; the casting trolley Z with the box card. DETAILED DESCRIPTION

[0036] The present invention will be further described in detail below with reference to the accompanying drawings and by way of examples. The following examples are intended to explain the present invention but the present invention is not limited to the following examples.

[0037] Example

[0038] See also Figures 1 to 17The automatic box locking device for the iron mold sand-coated casting pouring trolley in this embodiment includes a trolley box card closing guide plate 1, an upper beam 2, a column 6, a lifting hydraulic cylinder 3, a lifting movable beam 5 and a plurality of box card locking and tightening devices 4. The upper part of the column 6 is fixed to the upper beam 2, and the column 6 is arranged on the ground on both sides of the pouring trolley. The lifting hydraulic cylinder 3 is fixed on the upper beam 2, and a plurality of box card locking and tightening devices 4 are all installed on the lifting movable beam 5. The piston rod of the lifting hydraulic cylinder 3 is connected to the lifting movable beam 5.

[0039] See also Figure 4 In this embodiment, the box card locking and tightening device 4 includes a pneumatic rotary motor 41, a fork-type locking rotary head 42 and multiple float automatic alignment devices 43. The multiple float automatic alignment devices 43 are all connected to the lifting beam 5. The fork-type locking rotary head 42 is installed on the output shaft 411 of the pneumatic rotary motor 41.

[0040] See also Figure 5-Figure 7 The float automatic alignment device 43 of this embodiment is used to automatically align the center lines of the two when the center line position of the trolley box card screw is not concentric with the center line position of the corresponding box card locking and tightening device 4 due to position positioning error.

[0041] The multiple float automatic alignment devices 43 of this embodiment all include a floating steel ball 431, a pneumatic motor fixing plate 432 and a floating device bottom plate 433. Four floating steel balls 431 are arranged in each float automatic alignment device 43, so that the device can move freely within a certain range to achieve the purpose of automatic alignment. The range of free movement in this device is within a radius of 12 mm.

[0042] The floating device bottom plate 433 of the four float ball automatic alignment devices 43 of this embodiment is installed on the lifting beam 5 of the installation box card locking and tightening device 4, and the installation position is consistent with the four box card positions on the casting trolley. The pneumatic motor fixing plate 432 is fixedly connected to the fixed installation mechanism at the bottom of the pneumatic rotary locking device.

[0043] The box card locking and tightening device 4 of this embodiment is a commercial pneumatic motor; a fork-type locking rotating head 42 is installed on the output shaft 411 of the pneumatic rotary motor 41.

[0044] The two fork frame straight rods 421 of the fork frame locking rotating head 42 of the present embodiment are provided with a connecting flange 423 between the output shaft 411 of the pneumatic rotary motor 41; the two fork frame straight rods 421 of the fork frame locking rotating head 42 are round rod structures, and the heads of the round rod structures are round spherical rods 422 with a certain taper. This shape is mainly to enable the two round rods of the fork frame locking rotating device to automatically slide and insert into the gaps on both sides of the tightening head of the screw rod head of the trolley box during the descending process, that is, if the fork frame is just in the gap on both sides of the cross bar, the fork frame locking rotating head 42 can be lowered and directly inserted. When the fork frame round rod just touches the cross round rod of the screw head, under the action of the tapered ball at the front part of the round rod of the fork frame locking rotating head 42, the locking pneumatic motor can automatically rotate a certain angle, so that the round rod of the fork frame locking rotating head 42 can automatically insert into the gaps on both sides of the rotating cross round rod of the locking screw of the trolley box. In this way, during the descent of the box card locking and tightening device 4, the two round rod heads of the fork-frame locking rotating head 42 in the device can be automatically inserted into the tightening spaces on both sides of the horizontal round rod of the head of the box card screw of the casting trolley. Until the lifting hydraulic cylinder 3 is lowered into place. Turn on the air motor intake, and the pneumatic rotary locking device begins to rotate. Under the action of the rotational force, the float automatic alignment device 43 will automatically align the screw center line of the box card in the casting trolley with the rotation center line of the fork-frame locking rotating head 42 in this device, and rotate the screw of the box card clockwise, thereby tightening and compacting the upper and lower iron molds to achieve the locking operation of the upper and lower iron molds. During the locking process of the box card, the trolley box card closing guide plate 1 is always close to the box card push rod wheel of the casting trolley to prevent the box card from opening outwards during the locking process.

[0045] In this embodiment, there are two trolley box card closing guide plates 1, and the two trolley box card closing guide plates 1 are respectively installed on the two side columns 6.

[0046] In this embodiment, four lifting guide rods 7 are installed on the lifting beam 5. The lifting guide rods 7 slide up and down in the guide sleeve holes on the upper beam 2 as the lifting beam 5 moves up and down, so that the lifting beam 5 can be lifted and lowered smoothly, and at the same time, the lifting beam 5 will not twist when the box card locking and tightening device 4 performs the box card locking work.

[0047] In this embodiment, there are four box card locking and tightening devices 4, and the four box card locking and tightening devices 4 are all installed on the lifting beam 5. The positions of the four box card locking and tightening devices 4 correspond to the positions of the four box cards on the casting trolley.

[0048] In this embodiment, the locking box card closing guide plate 1, the column 6 and the upper beam 2 adopt an integral frame structure.

[0049] In this embodiment, the lifting movable beam 5 equipped with the box card locking and tightening device 4 moves along with the lifting and lowering of the lifting hydraulic cylinder 3.

[0050] The box card locking and tightening device 4 of this embodiment realizes the rotational locking of the screw rod of the iron box card by rotating clockwise.

[0051] The working principle of the automatic box locking device of this embodiment: the box card locking and tightening device 4 is used to lock / loosen the box of the casting trolley. Two trolley box card closing guide plates 1 (progressive propulsion tracks) are set on both sides of the trolley in the running direction of the casting trolley. When the casting trolley is moving, the casting trolley gradually enters the automatic locking device of this application, and the push rod wheel on the push rod of the box card connecting rod mechanism on the casting trolley enters the trolley box card closing guide plate 1 (progressive propulsion track), and the casting trolley box card closing push rod wheel moves along the trolley box card closing guide plate 1, so that the push rods on both sides of the trolley are gradually pushed toward the center line of the trolley a certain distance, thereby closing the box card on the casting trolley to the iron mold locking box card position. When the locking box card device on the trolley closes and reaches the iron mold locking box card position, the trolley stops moving, and the four tightening devices above the box card tightening screws on both sides of the trolley automatically fall down and automatically align with their corresponding tightening screws. Then the four screws can be tightened to lock the upper and lower iron molds, automatically completing the process of locking the upper and lower iron molds on the casting trolley.

[0052] See also Figure 8-Figure 17 The working process of the automatic locking box device of the pouring trolley for iron mold sand casting in this embodiment is as follows: in the pouring section of the iron sand production line, the pouring trolleys are connected one by one in a row, and their forward transportation adopts pulsating push transportation. The pouring trolley Z with box cards carrying upper and lower iron molds on the pouring section moves along the running direction of the pouring trolley in the pouring section under the action of the trolley pusher system. Each time it moves, it transports a distance of the length of a trolley. The trolley gradually enters the automatic box closing and locking device station of the upper and lower iron molds in this application document. As the pouring trolley moves forward, the pushing wheels on the pushing rods of the box card devices on both sides of the pouring trolley contact the trolley box card closing guide plate 1. Under the action of the trolley box card closing guide plate 1, the pushing wheels gradually move closer to the center line of the trolley, driving the box cards on the pouring trolley to gradually close toward the center line of the trolley, until the box cards on the pouring trolley are completely closed, so that the trolley box card locking mechanism is in the box closing and locking working position, the trolley stops moving, and then the upper and lower iron mold box closing and locking operations are started at this position. The hydraulic cylinder on the frame beam 2 of the locking and tightening device of the present application document drives the lifting movable beam 5 on which the box card locking and tightening device 4 is installed to begin to descend. As the hydraulic cylinder descends, the fork-frame type locking rotating head 42 of the box card locking and tightening device 4 descends accordingly. After hitting the horizontal round rod of the locking screw head of the trolley box card, the two round rods of the fork-frame type locking rotating head 42 can be automatically inserted into the empty spaces on both sides of the rotating horizontal round rod of the locking screw of the trolley box card. The hydraulic cylinder continues to descend for a certain distance and then stops. The distance L from the bottom of the round rod head of the fork-frame type locking rotating head 42 to the upper plane of the trolley box card is greater than b+20 mm, and b represents the distance from the lower plane of the lower iron running edge to the upper plane of the lower end protrusion of the trolley box card; (see Figure 12-13 ), to ensure that the bottom of the locking fork frame of the box card will not touch the upper plane of the box card during the locking process, causing the locking fork frame to be blocked and stop rotating, resulting in the box card being unable to be locked. Then the compressed air is led to rotate the pneumatic motor. As the pneumatic motor rotates, the fork frame locking rotating head 42 drives the box card locking screw to rotate, locking the upper and lower iron molds. After the iron mold is locked, the casting trolley, under the action of the trolley pusher system, pushes the casting trolley after the upper and lower iron molds are locked away from the iron mold closing and locking station, and at the same time pushes the next trolley that needs to be locked into the device of this application document (iron mold closing and locking station). After the iron mold is locked, the trolley enters the molten iron pouring section, and the molten iron can be poured. The purpose of using a pneumatic motor is to adjust the size of the closing locking force of the upper and lower iron molds by adjusting the air pressure of the compressed air to meet the different requirements of different castings for the required closing locking force.

[0053] The iron mold closing box locking device for the casting trolley with a built-in locking device in this embodiment is mainly used for locking the upper and lower iron molds in the casting section of the mechanized and automated iron mold sand-coated casting production line, and then the molten iron can be poured. Before the casting trolley carrying the upper and lower iron molds after closing the box enters the molten iron pouring section, the upper and lower iron molds must be tightly locked with the box card locking device built into the casting trolley.

[0054] This embodiment enables the above-mentioned actions that originally needed to be completed manually to be automatically completed by a mechanical device; the structure of the pouring trolley Z with box card in this application, since the applicant has previously submitted patent application documents for the structure of the pouring trolley, this structure will not be expanded in this application, and this application is an automatic box locking device for an iron mold sand-coated casting pouring trolley.

[0055] Through the above description, those skilled in the art can already implement it.

[0056] In addition, it should be noted that the shapes and names of the parts and components of the specific embodiments described in this specification may be different, and the above content described in this specification is only an example of the structure of the present invention. All equivalent changes or simple changes made based on the structure, features and principles described in the patent concept of the present invention are included in the protection scope of the patent of the present invention. Technicians in the technical field of the present invention can make various modifications or supplements to the specific embodiments described or replace them in a similar manner, as long as they do not deviate from the structure of the present invention or exceed the scope defined by the claims, they should all fall within the protection scope of the present invention.

Claims

1. An automatic box locking device for a casting trolley for iron mold sand casting, comprising an upper beam, a column and a lifting hydraulic cylinder, wherein the upper part of the column is fixed to the upper beam, the column is arranged on the ground on both sides of the casting trolley, and the lifting hydraulic cylinder is fixed on the upper beam, characterized in that: The utility model also includes a lifting beam, a trolley box card closing guide plate, four lifting guide rods and a plurality of box card locking and tightening devices, wherein the plurality of box card locking and tightening devices are all installed on the lifting beam, and the piston rod of the lifting hydraulic cylinder is connected to the lifting beam; the box card locking and tightening device includes a pneumatic rotary motor, a fork frame locking rotating head and a plurality of floating ball automatic alignment devices, and the plurality of floating ball automatic alignment devices are all connected to the lifting beam, and the output shaft of the pneumatic rotary motor is equipped with a fork frame locking rotating head; the plurality of floating ball automatic alignment devices all include floating steel balls, a pneumatic motor fixing plate and a floating device bottom plate, and each floating ball automatic alignment device is provided with four floating steel balls, and the floating device bottom plate is installed on the lifting beam, and the pneumatic motor fixing plate is connected to the fixed installation mechanism at the lower part of the box card locking and tightening device; there are two trolley box card closing guide plates, and the two trolley box card closing guide plates are respectively installed on the columns on both sides; four lifting guide rods are installed on the lifting beam, and the lifting guide rods slide up and down in the guide sleeve hole on the upper beam with the lifting action of the lifting beam.

2. The automatic box locking device for the iron mold sand-coated casting pouring trolley according to claim 1 is characterized in that: There are four box card locking and tightening devices, which are all installed on the lifting moving beam. The positions of the four box card locking and tightening devices correspond to the positions of the four box cards on the casting trolley.

3. The automatic box locking device for the iron mold sand-coated casting pouring trolley according to claim 1 is characterized in that: The trolley box card closing guide plate, the column and the upper beam adopt an integral frame structure.

4. The automatic box locking device for the iron mold sand-coated casting pouring trolley according to claim 1 is characterized in that: The lifting movable beam equipped with the box card locking and tightening device moves along with the lifting and lowering of the lifting hydraulic cylinder.

5. The automatic box locking device for the iron mold sand-coated casting pouring trolley according to claim 1 is characterized in that: The fork frame type locking rotating head is provided with two fork frame straight rods, and the two fork frame straight rods are round rod structures, and the heads of the round rod structures are round spherical rods with a certain taper.

6. The automatic box locking device for the iron mold sand-covered casting pouring trolley according to claim 1 is characterized in that: The floating range of the float automatic alignment device is within a radius of 12 mm.

7. The automatic box locking device for the iron mold sand-coated casting pouring trolley according to claim 1 is characterized in that: The distance L from the bottom of the round rod head of the fork-type locking rotating head to the upper plane of the trolley box card is b+20mm; b represents the distance from the lower plane of the lower iron running edge to the upper plane of the protrusion at the lower end of the trolley box card.

8. A working method of an automatic box locking device for a casting trolley for iron mold covered with sand, using the automatic box locking device for a casting trolley for iron mold covered with sand according to any one of claims 1 to 7, characterized in that: Here are the steps: In the pouring section of the iron sand production line, the pouring trolleys are connected in a row and transported by pulsating push; the self-contained box-card pouring trolley with upper and lower iron molds on the pouring section moves along the running direction of the pouring trolley in the pouring section under the action of the trolley pusher system. Each time it moves, it transports a distance of the length of a trolley, and the trolley gradually enters the automatic box closing and locking device station of the upper and lower iron molds. As the pouring trolley moves forward, the pushing wheels on the pushing rods of the box card devices on both sides of the pouring trolley contact the box card closing guide plate of the trolley. Under the action of the box card closing guide plate of the trolley, the pushing wheels gradually move closer to the center line of the trolley, driving the box card on the pouring trolley to gradually close to the center line of the trolley, until the box card on the pouring trolley is completely closed, so that the box card locking mechanism of the trolley is in the box closing and locking working position, the pouring trolley stops moving, and then the box closing and locking operation of the upper and lower iron molds is started at this position; The lifting hydraulic cylinder drives the lifting moving beam on which the box card locking and tightening device is installed to start to descend. As the lifting hydraulic cylinder descends, the fork-frame locking rotating head of the box card locking and tightening device descends accordingly. After hitting the horizontal round rod of the locking screw head of the trolley box card, the two round rods of the fork-frame locking rotating head can automatically insert into the empty spaces on both sides of the rotating horizontal round rod of the locking screw of the trolley box card. The hydraulic cylinder continues to descend for a certain distance and then stops. The distance from the bottom of the round rod head of the fork-frame locking rotating head to the upper plane of the trolley box card is L>b+20 mm, and b represents the distance from the lower plane of the lower iron type running edge to the upper plane of the protrusion at the lower end of the trolley box card; then compressed air is introduced to rotate the pneumatic motor. As the pneumatic motor rotates, the fork-frame locking rotating head drives the box card locking screw to rotate, locking the upper and lower iron types; After the iron mold is locked, the casting trolley, under the action of the trolley pushing system, pushes the locked casting trolley away from the iron mold closing and locking station, and at the same time pushes the next trolley that needs to be locked into the iron mold closing and locking station; the trolley after the iron mold is locked enters the molten iron pouring section for pouring of molten iron.

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