Sand core structure for casting electro-hydraulic valve

Abstract

The utility model relates to a sand core structure for casting an electro-hydraulic valve, which is characterized in that the top end of an auxiliary core I is provided with a positioning spigot for positioning an auxiliary core II, and the auxiliary core I is internally provided with an insertion hole for being matched with a fixing device to lock the auxiliary core I; the fixing device comprises a fixing assembly which is arranged in the main core and used for being inserted into the inserting hole, and an auxiliary assembly used for controlling the fixing assembly to be inserted into the inserting hole is arranged in the main core. The three inserting rods are inserted into the three positioning spigots, and meanwhile the third connecting rod can be inserted into the connecting hole; then the first auxiliary core is placed in the main core shaft, at the moment, the contact rod can be in positioning contact fit with the positioning hole, and finally the spring in a compressed state can enable the limiting plate to move rightwards along the sliding rod under the elastic effect, so that the locking rod can be controlled to be inserted into the inserting hole to combine the main core, the first auxiliary core and the second auxiliary core into the integrated sand core. And the casting precision is achieved through a multi-time sand-shooting core-making technology, and all the sand cores are connected in a positioning mode and fixed.

Description

Technical Field

[0001] This utility model relates to the field of electro-hydraulic valve casting technology, and in particular to a sand core structure for electro-hydraulic valve casting. Background Technology

[0002] Electro-hydraulic valves are typically manufactured using a casting process. The casting sand core has a complex internal cavity and plays a crucial role in casting production. The core shooter uses compressed air to evenly inject molding sand into the sand box for pre-compacting, and then applies pressure to compact it for sand injection. Currently, the sand core assembly process for traditional engineering machinery hydraulic solenoid valves involves many steps and requires a large number of movable blocks and sand cores. However, due to the complex structure of the sand core, it is difficult to mold all the complex sand cores at once. For example, the sand core mold for casting a hydraulic solenoid valve for engineering machinery, as described in Chinese patent application number CN201821277864.8, includes a sand box, a sand mold, and a sand core assembly. The sand core assembly is placed on the sand mold, and the sand core assembly and sand mold are placed inside the sand box to form a casting cavity together with the sand box. The sand core assembly and sand mold are positioned on the sand box. In this utility model, the combination of the sand core assembly and the sand mold serves as the casting part of the hydraulic solenoid valve. The hollow sand core structure makes the sand core lighter and reduces the amount of sand used, thus reducing costs. By selecting a reasonable parting position, the number of sand core assemblies is minimized while reducing the use of movable blocks, simplifying the production process of casting hydraulic solenoid valves.

[0003] However, when multiple sand cores are coaxially arranged on a sand core frame to form a sand core structure, the lack of a device for positioning and fixing the multiple sand cores makes it difficult to demold the electro-hydraulic valve sand core in one go when using multiple sand cores to form a sand core structure. At the same time, the multiple sand cores are prone to displacement. Utility Model Content

[0004] To address the issues raised in the background art, such as the lack of a device for positioning and fixing multiple sand cores, which makes it difficult to demold the electro-hydraulic valve sand core in one go when using multiple sand cores to form a sand core structure, and the tendency for multiple sand cores to shift, this utility model provides the following technical solution:

[0005] A sand core structure for casting electro-hydraulic valves includes a main core disposed within a sand core box. A secondary core 1 is disposed within the main core for cooperating with the main core. A secondary core 2 is disposed at the top of the secondary core 1 for cooperating with the secondary core 2 to form an integral sand core with the main core. A fixing device for locking the secondary core 1 is disposed within the main core.

[0006] The top of the first auxiliary core is provided with a positioning stop for positioning the second auxiliary core, and there are three positioning stops. The first auxiliary core is provided with a socket for locking the second auxiliary core in conjunction with a fixing device.

[0007] The fixing device includes a fixing component disposed within the main core for insertion into the socket, and an auxiliary component disposed within the main core for controlling the insertion of the fixing component into the socket.

[0008] Furthermore, two main spindles are fixedly installed on the frame of the main core, and a connecting rod one and a connecting rod two are fixedly installed at the top end of the main spindle.

[0009] Furthermore, the left and right ends of the secondary core are fixedly equipped with contact rods for positioning and fixing with the main core shaft, the bottom end of the secondary core is fixedly equipped with a plug rod for positioning and fixing with the positioning stop, and the bottom end of the secondary core is fixedly equipped with a connecting rod three.

[0010] Furthermore, the top of the secondary core is provided with a connection port for positioning and engaging with the connecting rod three, and the connection port is located on the right side of the positioning stop.

[0011] Furthermore, the auxiliary component includes a slide rod fixedly installed inside the main core for sliding the fixing component, and a spring is fitted on the slide rod for inserting the fixing component into the socket.

[0012] Furthermore, the fixing assembly includes a limiting plate fitted onto the slide rod for left and right movement, and a locking rod for inserting into the socket to fix the secondary core is fixedly installed on the limiting plate away from the slide rod. An operating plate for driving the limiting plate to move left and right is fixedly installed at the bottom end of the limiting plate.

[0013] Compared with the prior art, the beneficial effects of this utility model are:

[0014] By setting up a main core, secondary core one, secondary core two, and a fixing device, when it is necessary to combine the main core, secondary core one, and secondary core two into a single sand core, three insert rods can be inserted into three positioning stops, and a connecting rod three can be inserted into a connecting hole, thus achieving positioning contact and fixing of secondary core one and secondary core two. Then, secondary core one is placed into the main core shaft, at which point the contact rod and the positioning hole can be positioned and engaged, thus making secondary core one and the main core a whole. Finally, the spring in a compressed state, under the elastic action, can cause the limiting plate to move to the right along the sliding rod, thereby controlling the locking rod to be inserted into the insert hole to combine the main core, secondary core one, and secondary core two into a single sand core. In this way, the casting accuracy can be achieved through multiple sand shooting core making technology, with each sand core positioned and connected, the sand core fixed, and high dimensional accuracy and high strength. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0016] Figure 2 This is a front view of the present utility model;

[0017] Figure 3 This is a front view of the main core of this utility model;

[0018] Figure 4 This is a top sectional view of the sub-core of this utility model;

[0019] Figure 5 This is a front view of the secondary core of this utility model;

[0020] Figure 6 This is a schematic diagram of the fixing device structure of this utility model.

[0021] The following is a list of component names represented by the various reference numerals in the attached figures:

[0022] 100-Main core, 101-Main spindle, 102-Connecting rod one, 103-Connecting rod two;

[0023] 200-Secondary core 1, 201-Connecting port, 202-Insertion hole, 203-Positioning stop;

[0024] 300 - Secondary core, 301 - Insert rod, 302 - Connecting rod, 303 - Contact rod

[0025] 400-Fixing device, 410-Auxiliary component, 411-Slide bar, 412-Spring, 420-Fixing component, 421-Operating panel, 422-Limiting plate, 423-Locking rod. Detailed Implementation

[0026] The preferred embodiments of this utility model are described in detail below, and a clear and complete explanation is given in conjunction with the accompanying drawings.

[0027] Please see Figures 1-6 This utility model provides a sand core structure for casting electro-hydraulic valves.

[0028] It includes a main core 100 set inside a sand core box, a secondary core 200 that cooperates with the main core 100 inside the main core 100, a secondary core 300 that cooperates with the secondary core 300 to form an integral sand core with the main core 100 at its top end, and a fixing device 400 for locking the secondary core 200 inside the main core 100.

[0029] Two main spindles 101 are fixedly installed on the frame of the main core 100, and the two main spindles 101 are provided with positioning holes for positioning contact with the auxiliary core 200 at their close ends; a connecting rod 102 is fixedly installed at the top end of the main spindle 101, and a connecting rod 203 is fixedly installed at the top end of the main spindle 101.

[0030] The top of the secondary core 200 has a positioning stop 203 for positioning the secondary core 200, and there are three positioning stops 203 arranged in a circular array on the top of the secondary core 200; the top of the secondary core 200 has a connecting port 201 for positioning and contacting the connecting rod 302, and the connecting port 201 is located to the right of the positioning stop 203; the secondary core 200 has a part inside for cooperating with the fixing device 400 to position the secondary core 200. The locking hole 202 is used to facilitate the positioning and fixing by inserting the fixing device 400 into the positioning contact hole 202. This allows the main core 100, auxiliary core 1 200 and auxiliary core 2 300 to be combined into a single sand core, enabling rapid casting of electro-hydraulic valves. When it is necessary to combine auxiliary core 1 200 with the main core 100, auxiliary core 1 200 can be placed into the main core 100 and fixed in place by the fixing device 400.

[0031] The left and right ends of the secondary core 300 are fixedly equipped with contact rods 303 for positioning and fixing with the main core 101. The contact rods 303 are inserted into the positioning holes of the two main cores 101, and the main core 100 and the secondary core 300 are fixedly positioned in contact. The bottom end of the secondary core 300 is fixedly equipped with a plug rod 301 for positioning and fixing with the positioning stop 203. The plug rod 301 can be inserted into the positioning stop 203 and achieve positioning contact, so as to facilitate the combination of the main core 100, the secondary core 200 and the secondary core 300 into a whole sand core. The bottom end of the secondary core 300 is fixedly equipped with a connecting rod 302, and the connecting rod 302 can be inserted into the connecting hole 201.

[0032] The fixing device 400 includes a fixing component 420 disposed in the main core 100 for insertion into the socket 202, and an auxiliary component 410 disposed in the main core 100 for controlling the insertion of the fixing component 420 into the socket 202.

[0033] The auxiliary component 410 includes a slide rod 411 fixedly installed in the main core 100 for sliding the fixing component 420. A spring 412 is fitted on the rod of the slide rod 411 for inserting the fixing component 420 into the socket 202.

[0034] The fixing assembly 420 includes a limiting plate 422 for left and right movement, fitted onto the rod body of the slide rod 411. A locking rod 423 is fixedly installed on the limiting plate 422 away from the slide rod 411 for inserting into the insertion hole 202 to fix the secondary core 200. An operating plate 421 for driving the limiting plate 422 to move left and right is fixedly installed at the bottom end of the limiting plate 422. Therefore, when it is necessary to combine the main core 100, secondary core 200, and secondary core 200 into a single sand core, the three insertion rods 301 can be inserted into the three positioning stops 203, and the connecting rod 302 can be inserted into the connecting hole 201, thus enabling the secondary core 200 and... The positioning contact of the secondary core 300 is fixed; then the primary core 200 is placed into the main core 101. At this time, the contact rod 303 can be positioned and engaged with the positioning hole, so that the secondary core 200 and the main core 100 can form a whole; finally, the spring 412 in the compressed state can move the limiting plate 422 along the slide rod 411 to the right under the elastic action, so as to control the locking rod 423 to be inserted into the insertion hole 202 to combine the main core 100, the secondary core 200 and the secondary core 300 into a whole sand core. Then, the casting accuracy can be achieved through multiple sand shooting core making technology. The sand cores are positioned and connected, the sand cores are fixed, and the dimensional accuracy and strength are high.

[0035] The accompanying drawings illustrate that those skilled in the art will be able to understand and implement this utility model. Furthermore, any non-creative modifications made to this utility model by those skilled in the art without inventive effort are still within the protection scope of this utility model.

Claims

1. An electro-hydraulic valve casting sand core structure comprising a main core (100) disposed within a core box, characterized by: The main core (100) is provided with a secondary core I (200) matched with the main core (100), the top end of the secondary core I (200) is provided with a secondary core II (300) matched with the main core (100) to form an integral sand core, and the main core (100) is provided with a fixing device (400) for locking the secondary core I (200); The top end of the secondary core I (200) is provided with three positioning stoppers (203) for positioning the secondary core II (300), and the secondary core I (200) is provided with a jack (202) matched with the fixing device (400) for locking the secondary core I (200); The fixing device (400) comprises a fixing assembly (420) arranged in the main core (100) and inserted into the jack (202), and the main core (100) is provided with an auxiliary assembly (410) for controlling the insertion of the fixing assembly (420) into the jack (202).

2. The sand core structure for electro-hydraulic valve casting according to claim 1, wherein: Two main core shafts (101) are fixedly installed on the frame body of the main core (100), the top end of the main core shaft (101) is fixedly installed with a connecting rod I (102), and the top end of the main core shaft (101) is fixedly installed with a connecting rod II (103).

3. An electro-hydraulic valve casting sand core structure according to claim 2, characterized in that: The left and right ends of the secondary core II (300) are fixedly installed with contact rods (303) for positioning and fixing with the main core shaft (101), the bottom end of the secondary core II (300) is fixedly installed with a plug rod (301) for positioning and fixing with the positioning stopper (203), and the bottom end of the secondary core II (300) is fixedly installed with a connecting rod III (302).

4. An electro-hydraulic valve casting sand core structure according to claim 3, characterized in that: The top end of the secondary core I (200) is provided with a connecting port (201) for positioning and contact matching with the connecting rod III (302), and the connecting port (201) is located on the right side of the positioning stopper (203).

5. An electro-hydraulic valve casting sand core structure according to claim 4, characterized in that: The auxiliary assembly (410) comprises a sliding rod (411) fixedly installed in the main core (100) for sliding of the fixing assembly (420), and the rod body of the sliding rod (411) is sleeved with a spring (412) for inserting the fixing assembly (420) into the jack (202).

6. An electro-hydraulic valve casting sand core structure according to claim 5, characterized in that: The fixing assembly (420) comprises a limiting plate (422) sleeved on the rod body of the sliding rod (411) for left and right movement, the limiting plate (422) is fixedly installed with a locking rod (423) for inserting into the jack (202) and fixing the secondary core I (200) away from the sliding rod (411), and the bottom end of the limiting plate (422) is fixedly installed with an operation plate (421) for driving the limiting plate (422) to move left and right.

Images