Turbine shell heating block pressing device

Abstract

The utility model discloses a turbine shell heating block pressing device which comprises a pressing device body located between an upper die and a lower die, the pressing device body comprises an ejector rod, a screw rod and a sleeve, the sleeve is connected with the upper die through the screw rod, an elastic assembly is arranged in the sleeve, the elastic assembly is connected with the sleeve in a sliding mode, and the elastic assembly is located between the ejector rod and the screw rod. The ejector rod comprises a connecting rod and a pressing rod, one end of the connecting rod is connected with the elastic assembly, and the other end of the connecting rod is connected with the pressing rod through a universal joint. The pressing device presses the heating block on the lower die to ensure that the heating block cannot move in the sand shooting process, meanwhile, the ejector rod is in contact with the screw rod through the elastic assembly, and the maximum deformation quantity of the elastic assembly is limited by adjusting the distance of the screw rod extending into the sleeve, so that the maximum pressure borne by the heating block is limited, and the heating block is prevented from being broken; the connecting rod and the pressing rod can move relatively through the universal joint, when the heating block slightly displaces, the pressing rod can swing along with the heating block, and the heating block is prevented from being broken.

Description

Technical Field

[0001] The utility model relates to the technical field of casting mold accessories, and particularly relates to a pressing device for a turbine housing heating block. Background Art

[0002] In the turbine housing casting process, shrinkage porosity defects exist in some specific areas of the casting. During the exploration of the innovation of the turbine housing casting process, a casting auxiliary material, the heating block, was discovered, which can effectively improve the shrinkage porosity defects at specific positions on the casting, and at the same time will not cause adverse effects on the appearance of the non-machined surface of the casting.

[0003] However, after the heating block was put into mass production, due to its non-magnetic properties, it cannot be conveniently fixed on the mold by magnet adsorption like traditional chill blocks. Even with auxiliary limiting measures such as retaining pins, it is still difficult to ensure the stability of the heating block during the sand shooting process, resulting in stepped defects frequently appearing at the corresponding positions on the casting where the heating block is used, significantly increasing the repair rate of the casting. In severe cases, it will even cause the outer contour dimensions of the casting to exceed the tolerance range, directly leading to scrapping, posing a severe challenge to production efficiency and cost control.

[0004] To overcome this problem, referring to the prior art, double-sided tape was used to fix the heating block. Although the double-sided tape can achieve effective fixation in the short term, in mass production, manual pasting of double-sided tape is required, resulting in high labor intensity and difficult-to-guarantee pasting accuracy, thus easily causing defects in the appearance of the casting.

[0005] To solve the above problems, a lever pressing mechanism was adopted, and the heating block was tightly pressed on the mold through the lever, significantly enhancing the stability of the heating block during the sand shooting process. However, this method still has the following problems: Since the heating block is relatively brittle, if the pressure of the lever cannot be accurately controlled, it is easy to cause the heating block to be crushed.

[0006] At the same time, the heating block is a consumable item. To reduce production costs, the dimensional accuracy of its surface is limited, and there is a gap between it and the mold when not under pressure. When the upper mold and the lower mold are closed, the heating block is prone to slight movement at the moment of being pressed. If the lever prevents the horizontal movement of the heating block at this time, the heating block that is squeezed by the lever and the mold is likely to directly break, resulting in production interruption. Summary of the Invention

[0007] The purpose of the utility model is to provide a pressing device for a turbine housing heating block aiming at the problems existing in the prior art.

[0008] To achieve the above purpose, the technical solution adopted by the utility model is:

[0009] A pressing device for a turbine housing heating block, comprising a pressing device located between an upper die and a lower die. The pressing device includes a ejector rod, a screw rod and a sleeve. The sleeve is connected to the upper die through the screw rod. An elastic component is arranged in the sleeve. The elastic component is slidably connected to the sleeve. The elastic component is located between the ejector rod and the screw rod. The ejector rod includes a connecting rod and a pressing rod. One end of the connecting rod is connected to the elastic component, and the other end is connected to the pressing rod through a universal joint. The pressing rod is used to contact the heating block.

[0010] In the utility model, the pressing device is used to press the heating block on the lower die to ensure that the heating block does not move during the sand shooting process. At the same time, since the ejector rod contacts the screw rod through the elastic component, the deformation amount of the elastic component determines the pressure received by the heating block. By adjusting the distance that the screw rod extends into the sleeve, the maximum deformation amount of the elastic component is limited, thereby limiting the maximum pressure received by the heating block and avoiding the fragmentation of the heating block. The connecting rod and the pressing rod can move relative to each other through the universal joint. When the heating block has a slight displacement, the pressing rod will swing with the heating block, reducing the friction force received by the heating block and avoiding the fragmentation of the heating block.

[0011] Preferably, the elastic component includes a spring, a first spring pressing plate and a second spring pressing plate. The spring is located between the first spring pressing plate and the second spring pressing plate. The first spring pressing plate is provided with a stud on the side far from the spring.

[0012] The first spring pressing plate is used to contact the ejector rod, and the second spring pressing plate is used to contact the screw rod. The first spring pressing plate and the second spring pressing plate enable the spring to effectively receive force.

[0013] Preferably, a baffle is provided at one end of the sleeve far from the screw rod. The first spring pressing plate is located between the baffle and the spring. A through hole is provided on the baffle, and the diameter of the through hole is larger than the diameter of the stud.

[0014] The baffle prevents the elastic component from coming out of the sleeve. The diameter of the through hole is larger than the diameter of the stud, which not only ensures that the stud can pass through smoothly and be connected to the connecting rod, but also avoids the wear and jamming caused by excessive friction.

[0015] Preferably, a groove is provided on the side of the connecting rod far from the pressing rod. Threads are provided on the inner wall of the groove. The connecting rod and the stud are connected by threads.

[0016] Through threaded connection, on the one hand, it ensures that the connecting rod will not be separated from the elastic component under pressure, and on the other hand, it can adjust the total length of the pressing device by rotating the connecting rod, so that the pressing device can adapt to heating blocks of different specifications.

[0017] Preferably, the sleeve includes a threaded section and a smooth section. The smooth section is located between the threaded section and the ejector rod. Threads are provided on the inner wall of the threaded section, and the threaded section is threadedly connected to the screw rod.

[0018] Preferably, the length of the threaded section is less than the length of the smooth section, and the length of the threaded section is greater than one-third of the length of the sleeve.

[0019] The threaded connection between the threaded section and the screw rod facilitates simple and precise adjustment of the distance that the screw rod extends into the sleeve. By restricting the length of the threaded section, it not only ensures sufficient connection length between the screw rod and the sleeve, but also leaves sufficient deformation space for the elastic component.

[0020] Preferably, an elastic pad is provided on the side of the pressure rod away from the connecting rod, and the pressure rod contacts the heating block through the elastic pad.

[0021] The design of the elastic pad can further reduce the direct impact and friction of the pressure rod on the heating block. At the same time, the elastic pad can also compensate for the unevenness of the surface of the heating block to a certain extent, making the distribution of the pressing force more uniform.

[0022] Preferably, the lower mold is arranged on the workbench. The heating block is located between the pressing device and the lower mold. The bottom of the heating block is attached to the lower mold, and the top of the heating block contacts the pressure rod.

[0023] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0024] (1) The present utility model uses a pressing device to press the heating block on the lower mold to ensure that the heating block does not move during the sand injection process. At the same time, since the ejector rod contacts the screw rod through the elastic component, the deformation amount of the elastic component determines the pressure received by the heating block. By adjusting the distance that the screw rod extends into the sleeve, the maximum deformation amount of the elastic component is restricted, thereby restricting the maximum pressure received by the heating block and avoiding the heating block from cracking.

[0025] (2) The universal joint in the present utility model enables the connecting rod and the pressure rod to move relative to each other. When the heating block undergoes a slight displacement, the pressure rod will swing with the heating block, reducing the friction force received by the heating block and avoiding the heating block from cracking. Description of the Drawings

[0026] Figure 1Schematic diagram of the upper die and the lower die when they are separated in the first embodiment of the present utility model;

[0027] Figure 2 Schematic diagram of the upper die and the lower die when they are closed in the first embodiment of the present utility model;

[0028] Figure 3 Schematic diagram of the structure of the pressing device and the heating block in the first embodiment of the present utility model;

[0029] Figure 4 Schematic diagram of the separated structure of the pressing device in the first embodiment of the present utility model;

[0030] Figure 5 Schematic diagram of the structure of the screw, the elastic component and the cut sleeve in the first embodiment of the present utility model;

[0031] Figure 6 Schematic diagram of the elastic component in the first embodiment of the present utility model;

[0032] Figure 7 Cross-sectional view of the sleeve in the first embodiment of the present utility model;

[0033] Figure 8 Schematic diagram of the separated structure of the pressing device in the second embodiment of the present utility model;

[0034] In the figure: 1. Upper die; 2. Lower die; 3. Heating block; 4. Pressing device; 5. Ejector rod; 501. Link rod; 502. Pressure rod; 503. Universal joint; 504. Elastic pad; 6. Screw; 7. Sleeve; 701. Threaded section; 702. Smooth section; 703. Baffle; 8. Elastic component; 801. First spring pressing plate. Detailed implementation manners

[0035] Next, the technical solutions of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. Based on the embodiments in the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the protection scope of the present utility model.

[0036] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "middle", "upper", "lower", "left", "right", "inside", "outside", etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model.

[0037] Such as Figures 1 to 7As shown in the figure, the specific solution of Embodiment 1 is as follows: A pressing device for a turbine housing heating block includes a pressing device 4 located between the upper die 1 and the lower die 2. The lower die 2 is arranged on the workbench. The heating block 3 is located between the pressing device 4 and the lower die 2. The contour of the bottom of the heating block 3 is designed according to the contour of the lower die 2, so that the bottom of the heating block 3 can be attached to the lower die 2. The upper die 1 approaches or moves away from the lower die 2 through a driving mechanism to complete the mold closing or mold opening action of the mold. The pressing device 4 is arranged on the upper die 1. After mold closing, the upper die 1 presses the heating block 3 tightly on the lower die 2 through the pressing device 4 to prevent the heating block 3 from shifting during the sand shooting process.

[0038] The pressing device 4 includes a ejector rod 5, a screw rod 6 and a sleeve 7. The sleeve 7 is located between the ejector rod 5 and the screw rod 6. The screw rod 6 is a double-headed screw rod 6. The sleeve 7 includes a threaded section 701 and a smooth section 702. The smooth section 702 is located between the threaded section 701 and the ejector rod 5. Threads are provided on the inner wall of the threaded section 701. The threaded section 701 of the sleeve 7 is threadedly connected with the screw rod 6, and the screw rod 6 is threadedly connected with the upper die 1.

[0039] A baffle 703 is provided at one end of the smooth section 702 of the sleeve 7 away from the screw rod 6. Through holes are provided on the baffle 703. An elastic component 8 is further provided in the sleeve 7. The elastic component 8 is located between the baffle 703 and the screw rod 6. The elastic component 8 is slidably connected with the sleeve 7. The sleeve 7 is used to limit the movement path of the elastic component 8. The elastic component 8 can be taken out from the end of the sleeve 7 where the baffle 703 is not installed, which is convenient for replacing elastic components 8 of different specifications.

[0040] The length of the threaded section 701 is less than the length of the smooth section 702, so as to prevent the screw rod 6 from extending too much into the sleeve 7 and leaving sufficient deformation space for the elastic component 8. The length of the threaded section 701 is greater than one-third of the length of the sleeve 7, ensuring that there is enough connection length between the screw rod 6 and the sleeve 7.

[0041] The elastic component 8 includes a spring, a first spring pressing plate 801 and a second spring pressing plate. The spring is located between the first spring pressing plate 801 and the second spring pressing plate. The first spring pressing plate 801 is located between the baffle 703 and the spring. A stud is provided on the side of the first spring pressing plate 801 away from the spring. The diameter of the through hole is greater than the diameter of the stud. The stud extends out of the sleeve 7 through the through hole.

[0042] The ejector rod 5 includes a connecting rod 501 and a pressing rod 502. The connecting rod 501 and the pressing rod 502 are connected by a universal joint 503. A groove is provided on the side of the connecting rod 501 away from the pressing rod 502. Threads are provided on the inner wall of the groove. The connecting rod 501 is threadedly connected with the stud on the first spring pressing plate 801. The pressing rod 502 is used to contact the heating block 3.

[0043] The working principle of the first embodiment is as follows: During mass production, the elastic component 8 is located between the ejector rod 5 and the screw rod 6. By adjusting the distance that the screw rod 6 extends into the sleeve 7, when the upper die 1 approaches the lower die 2, the heating block 3 that contacts the pressure rod 502 will lift the entire ejector rod 5, and the elastic component 8 will be lifted by the ejector rod 5. During this process, the elastic component 8 will contact the screw rod 6 and gradually deform under extrusion.

[0044] According to Hooke's law, the pressure on a spring is proportional to the deformation of the spring. This means that when the pressure on the spring increases, the deformation of the spring will also increase accordingly. Since the action of force is mutual, the pressure on the heating block 3 will also increase at this time. Therefore, by controlling the deformation of the spring, the pressure on the heating block 3 can be controlled.

[0045] And after the mold is closed, the pressure rod 502 presses the heating block 3 tightly against the lower die 2. At this time, the distance between the heating block 3 and the upper die 1 is determined. And the total length of the pressing device 4 in the shortest state can be determined by the distance between the heating block 3 and the upper die 1. Therefore, before starting production, according to the maximum pressure that the heating block 3 can withstand, the maximum deformation of the spring is determined. By rotating the connecting rod 501 and the sleeve 7, enough space can be left for the spring and the maximum deformation of the spring can be limited to avoid crushing the heating block 3.

[0046] At the same time, when the pressure rod 502 just contacts the heating block 3, if the heating block 3 undergoes a slight displacement, since a universal joint 503 is provided between the connecting rod 501 and the pressure rod 502, the pressure rod 502 can swing to a certain extent along with the heating block 3, thereby reducing the friction force on the heating block 3 and avoiding the risk of fragmentation caused by excessive friction.

[0047] Embodiment 2: As Figure 8 shown, the difference between the second embodiment and the first embodiment is that: an elastic pad 504 is provided on the side of the pressure rod 502 away from the connecting rod 501, and the pressure rod 502 contacts the heating block 3 through the elastic pad 504, and the elastic pad 504 is made of rubber material.

[0048] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A pressing device for a turbine housing heating block, comprising a pressing device located between an upper die and a lower die, characterized in that, The pressing device includes a ejector rod, a screw rod and a sleeve. The sleeve is connected to the upper die through the screw rod. An elastic component is arranged in the sleeve. The elastic component is slidably connected to the sleeve. The elastic component is located between the ejector rod and the screw rod. The ejector rod includes a connecting rod and a pressing rod. One end of the connecting rod is connected to the elastic component, and the other end is connected to the pressing rod through a universal joint. The pressing rod is used to contact the heating block.

2. The pressing device for the turbine housing heating block according to claim 1, characterized in that, The elastic component includes a spring, a first spring pressing plate and a second spring pressing plate. The spring is located between the first spring pressing plate and the second spring pressing plate. A stud is arranged on one side of the first spring pressing plate away from the spring.

3. The pressing device for the turbine housing heating block according to claim 2, wherein A baffle is arranged at one end of the sleeve away from the screw rod. The first spring pressing plate is located between the baffle and the spring. A through hole is arranged on the baffle. The diameter of the through hole is larger than the diameter of the stud.

4. A pressing device for a turbine housing heating block according to claim 2, characterized in that, A groove is arranged on one side of the connecting rod away from the pressing rod. Threads are arranged on the inner wall of the groove. The connecting rod and the stud are connected by threads.

5. A pressing device for a turbine housing heating block according to claim 1, characterized in that, The sleeve includes a threaded section and a smooth section. The smooth section is located between the threaded section and the ejector rod. Threads are arranged on the inner wall of the threaded section. The threaded section is connected to the screw rod by threads.

6. A pressing device for a turbine housing heating block according to claim 5, characterized in that, The length of the threaded section is less than the length of the smooth section. The length of the threaded section is greater than one-third of the length of the sleeve.

7. A pressing device for a turbine housing heating block according to claim 1, characterized in that, An elastic pad is arranged on one side of the pressing rod away from the connecting rod. The pressing rod contacts the heating block through the elastic pad.

8. A pressing device for a turbine housing heating block according to claim 1, characterized in that, The lower die is arranged on the workbench. The heating block is located between the pressing device and the lower die. The bottom of the heating block is attached to the lower die. The top of the heating block contacts the pressing rod.

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