Parallel pinhole collimator

Abstract

The invention discloses a parallel pinhole collimator in the technical field of collimator casting, the collimator is integrally cast and formed by lead alloy, the parallel pinhole collimator further comprises a casting device of the parallel pinhole collimator, the casting device comprises a telescopic cylinder, an upper die and a lower die, a lower jacking mechanism is installed at the top of the lower die, and the lower jacking mechanism is connected with the telescopic cylinder. The top of the upper die is connected with an upper jacking mechanism, and the output end of the telescopic cylinder is connected with the upper jacking mechanism; through the arrangement of the lower jacking mechanism and the upper jacking mechanism, the collimator can be automatically ejected downwards from the interior of the upper mold and automatically ejected upwards from the interior of the lower mold during mold opening of the telescopic cylinder, effective demolding of the collimator is guaranteed, and therefore the quality of the collimator is guaranteed.

Description

Technical Field

[0001] This invention relates to the technical field of collimator casting, and in particular to a parallel pinhole collimator. Background Technology

[0002] A parallel pinhole collimator is a device that allows only parallel (or nearly parallel) light rays to pass through. It utilizes the principle of pinhole imaging and combines it with a special structural design. It is mainly used in nuclear medicine imaging (such as SPECT) to determine the location and direction of radioactive materials distributed in the human body.

[0003] Currently, parallel pinhole collimators are typically manufactured using casting. However, existing casting equipment and molds address the issue of product adhesion and difficulty in demolding by installing a lifting mechanism on the lower mold side. However, in practice, the product sometimes adheres to the upper mold, making demolding difficult or resulting in frequent damage during demolding, thus affecting product quality. Summary of the Invention

[0004] The purpose of this section is to outline some aspects of embodiments of the present invention and to briefly describe some preferred embodiments. Simplifications or omissions may be made in this section, as well as in the abstract and title of the invention, to avoid obscuring the purpose of these documents; however, such simplifications or omissions should not be construed as limiting the scope of the invention.

[0005] Therefore, the purpose of this invention is to provide a parallel pinhole collimator. By setting up a lower lifting mechanism and an upper lifting mechanism, the collimator can be automatically ejected from the inside of the upper mold downwards when the telescopic cylinder opens the mold, and then automatically ejected from the inside of the lower mold upwards, ensuring the effective demolding of the collimator and thus ensuring the quality of the collimator.

[0006] To solve the above-mentioned technical problems, the present invention provides a parallel pinhole collimator, which adopts the following technical solution: the collimator is integrally cast from lead alloy, and also includes a casting device for the parallel pinhole collimator. The casting device includes a telescopic cylinder, an upper mold and a lower mold. A lower lifting mechanism is installed on the top of the lower mold, and an upper lifting mechanism is connected to the top of the upper mold. The output end of the telescopic cylinder is connected to the upper lifting mechanism.

[0007] Optionally, the lead alloy uses alloy.

[0008] Optionally, the collimator has an aperture of 4 mm, a wall thickness of 2 mm, and a height of 59 mm.

[0009] Optionally, the casting apparatus further includes a bottom plate and a top plate, with a first side plate and a second side plate fixed between the bottom plate and the top plate.

[0010] Optionally, the casting device further includes a lower lifting mechanism comprising a lower housing fixed to the bottom of the lower mold, a sliding track fixed to the bottom of the inner cavity of the lower housing, a lower wedge block slidably connected to the sliding track, a lower push rod provided at the bottom of the lower mold, a lower moving wheel fixed to the bottom of the lower push rod, the lower moving wheel contacting the upper surface of the lower wedge block, a first spring connected to one side wall of the lower wedge block and one side wall of the inner cavity of the lower housing, one end of a connecting rope connected to the other side of the lower wedge block, a guide wheel fixed to the side wall of the first side plate, a telescopic rod fixed to the bottom of the top plate, a lifting plate fixed to the bottom of the telescopic rod, and the other end of the connecting rope passing around the guide wheel and connected to the bottom end of the lifting plate.

[0011] Optionally, the upper lifting mechanism includes an upper housing fixed to the top of the upper mold, a telescopic cylinder fixed on the top plate, the output end of the telescopic cylinder being fixedly connected to the top of the upper housing, and a lifting rod located below the lifting plate being fixed on one side of the top of the upper housing.

[0012] Optionally, the upper lifting mechanism further includes an upper slide rail fixed to the top of the inner cavity of the upper housing, an upper wedge block slidably connected to the upper slide rail, an upper push rod provided at the top of the upper mold, an upper moving wheel fixed at the top end of the upper push rod, the upper moving wheel contacting the lower surface of the upper wedge block, a guide plate fixed on the second side plate, a guide protrusion installed on the guide plate, a second spring connected to one side wall of the upper wedge block and one side wall of the inner cavity of the upper housing, a movable rod fixed to the other side wall of the upper wedge block, and a drive wheel fixed to the end of the movable rod away from the upper wedge block.

[0013] Optionally, a connecting plate is fixed to both the upper ejector rod and the lower ejector rod, and a return spring is connected between the connecting plate of the upper ejector rod and the upper mold, and between the connecting plate of the lower ejector rod and the lower mold.

[0014] In summary, the present invention has at least one of the following beneficial effects: By setting up a lower lifting mechanism and an upper lifting mechanism, this invention can automatically eject the collimator from the inside of the upper mold downwards when the telescopic cylinder opens the mold, and then automatically eject the collimator from the inside of the lower mold upwards, ensuring the effective demolding of the collimator and thus guaranteeing the quality of the collimator. Attached Figure Description

[0015] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a schematic diagram of the lower lifting mechanism of the present invention; Figure 3 This is a schematic diagram of the lifting mechanism structure of the present invention.

[0017] Explanation of reference numerals in the attached drawings: 1. Telescopic cylinder; 2. Upper mold; 3. Lower mold; 4. Lower lifting mechanism; 5. Upper lifting mechanism; 6. Base plate; 7. Top plate; 8. First side plate; 9. Second side plate; 10. Lower housing; 11. Slide track; 12. Lower wedge block; 13. Lower push rod; 14. Lower moving wheel; 15. First spring; 16. Guide wheel; 17. Telescopic rod; 18. Lifting plate; 19. Lifting rod; 20. Connecting rope; 21. Upper housing; 22. Upper slide track; 23. Upper wedge block; 24. Upper push rod; 25. Upper moving wheel; 26. Guide plate; 27. Guide protrusion; 28. Second spring; 29. ​​Movable rod; 30. Drive wheel; 31. Connecting plate; 32. Return spring. Detailed Implementation

[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0019] In the description of this invention, it should be noted that the terms "upper," "lower," "inner," "outer," "top / bottom," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0020] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "sleeved / connected," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances. Example

[0021] Reference Figures 1-3This invention discloses a parallel pinhole collimator, which is integrally cast from lead alloy. It also includes a casting device for the parallel pinhole collimator, which includes a telescopic cylinder 1, an upper mold 2 and a lower mold 3. A lower lifting mechanism 4 is installed on the top of the lower mold 3, and an upper lifting mechanism 5 is connected to the top of the upper mold 2. The output end of the telescopic cylinder 1 is connected to the upper lifting mechanism 5.

[0022] With the above structure, the lower lifting mechanism 4 and the upper lifting mechanism 5 can be set up to separate the collimator from the upper mold 2 and the lower mold 3 when the mold is opened, ensuring the effective demolding of the collimator and thus ensuring the quality of the collimator.

[0023] In detail, in this embodiment, the lead alloy uses Alloy. The collimator has an aperture of 4mm, a wall thickness of 2mm, and a height of 59mm.

[0024] In detail, in this embodiment, the casting device also includes a bottom plate 6 and a top plate 7, with a first side plate 8 and a second side plate 9 fixed between the bottom plate 6 and the top plate 7.

[0025] In detail, in this embodiment, the casting device also includes a lower lifting mechanism 4, which includes a lower housing 10 fixed to the bottom of the lower mold 3. A sliding track 11 is fixed to the bottom of the inner cavity of the lower housing 10. A lower wedge block 12 is slidably connected to the sliding track 11. A lower push rod 13 is provided at the bottom of the lower mold 3. A lower moving wheel 14 is fixed to the bottom of the lower push rod 13. The lower moving wheel 14 contacts the upper surface of the lower wedge block 12. A first spring 15 is connected to one side wall of the lower wedge block 12 and one side wall of the inner cavity of the lower housing 10. One end of a connecting rope 20 is connected to the other side of the lower wedge block 12. A guide wheel 16 is fixed to the side wall of the first side plate 8. A telescopic rod 17 is fixed to the bottom of the top plate 7. A lifting plate 18 is fixed to the bottom of the telescopic rod 17. The other end of the connecting rope 20 passes around the guide wheel 16 and is connected to the bottom end of the lifting plate 18.

[0026] When the telescopic cylinder 1 retracts, it can lift the upper mold 2 upward, so that the upper mold 2 and the lower mold 3 are separated. During the retraction process, the telescopic cylinder 1 can drive the lifting rod 19 to move upward. The lifting rod 19 pushes the lifting plate 18 upward. The lifting plate 18 can pull one end of the connecting rope 20 upward, so that the other end of the connecting rope 20 pulls the lower wedge block 12 laterally. During the movement, the lower wedge block 12 will drive the lower push rod 13 upward through the lower moving wheel 14, so that the collimator can be automatically pushed upward from the inside of the lower mold 3.

[0027] In detail, in this embodiment, the upper lifting mechanism 5 includes an upper housing 21 fixed to the top of the upper mold 2, a telescopic cylinder 1 fixed on the top plate 7, the output end of the telescopic cylinder 1 being fixedly connected to the top of the upper housing 21, and a lifting rod 19 located below the lifting plate 18 being fixed on one side of the top of the upper housing 21.

[0028] The upper lifting mechanism 5 also includes an upper slide rail 22 fixed to the top of the inner cavity of the upper housing 21. An upper wedge block 23 is slidably connected to the upper slide rail 22. An upper push rod 24 is provided on the top of the upper mold 2. An upper moving wheel 25 is fixed to the top of the upper push rod 24. The upper moving wheel 25 contacts the lower surface of the upper wedge block 23. A guide plate 26 is fixed on the second side plate 9. A guide protrusion 27 is installed on the guide plate 26. A second spring 28 is connected to one side wall of the upper wedge block 23 and one side wall of the inner cavity of the upper housing 21. A movable rod 29 is fixed to the other side wall of the upper wedge block 23. A drive wheel 30 is fixed to one end of the movable rod 29 away from the upper wedge block 23.

[0029] Before the telescopic cylinder 1 retracts and automatically ejects the collimator from the inside of the lower mold 3, it lifts the upper mold 2 upward, separating the upper mold 2 from the lower mold 3. Before the lifting rod 19 contacts the lifting plate 18, it drives the drive wheel 30 connected to one end of the movable rod 29 to move upward. When the drive wheel 30 moves upward, it drives the upper wedge block 23 to move when it passes the protruding part of the guide protrusion 27. During the movement of the upper wedge block 23, it drives the lower moving wheel 14 to move downward, thereby driving the upper ejector rod 24 to push downward, so as to automatically eject the collimator from the inside of the upper mold 2.

[0030] In detail, in this embodiment, a connecting plate 31 is fixed on both the upper ejector rod 24 and the lower ejector rod 13. A return spring 32 is connected between the connecting plate 31 of the upper ejector rod 24 and the upper mold 2, and between the connecting plate 31 of the lower ejector rod 13 and the lower mold 3. Under the action of the return spring 32, when the collimator separates from the upper mold 2 and the lower mold 3, the upper ejector rod 24 and the lower ejector rod 13 will return to their initial positions.

[0031] Working principle: Step 1: After injection molding, start the telescopic cylinder 1. When the telescopic cylinder 1 retracts, it can lift the upper mold 2 upward, so that the upper mold 2 separates from the lower mold 3. Step 2: During the retraction of the telescopic cylinder 1, the drive wheel 30 will first pass through the guide protrusion 27. When it passes through the protruding part of the guide protrusion 27, it will drive the upper wedge block 23 to move. During the movement of the upper wedge block 23, it will drive the lower moving wheel 14 to move down, thereby driving the upper push rod 24 to push down, so that the collimator can be automatically pushed out from the inside of the upper mold 2 and fall into the lower mold 3. Step 3: During the retraction of the telescopic cylinder 1, it can drive the lifting rod 19 to move upward. The lifting rod 19 pushes the lifting plate 18 upward, and the lifting plate 18 can pull one end of the connecting rope 20 upward, so that the other end of the connecting rope 20 pulls the lower wedge block 12 laterally. During the movement, the lower wedge block 12 will drive the lower push rod 13 to push upward through the lower moving wheel 14, thereby automatically pushing the collimator upward from the inside of the lower mold 3. Step 4: After the collimator is ejected, it can be removed manually. Step 5: After the collimator is removed, control the extension cylinder 1 to extend. When the extension cylinder 1 extends, the upper mold 2 and the lower mold 3 will engage. Under the action of the return spring 32, the upper ejector rod 24 and the lower ejector rod 13 will return to their initial positions. The ends of the upper ejector rod 24 and the lower ejector rod 13 will block the demolding opening of the upper mold 2 and the lower mold 3, which can ensure that the collimator can be formed again.

[0032] The above are all preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, all equivalent changes made in accordance with the structure, shape and principle of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A parallel pinhole collimator, characterized in that: The collimator is made of lead alloy and is integrally cast. It also includes a casting device for a parallel pinhole collimator. The casting device includes a telescopic cylinder (1), an upper mold (2) and a lower mold (3). A lower lifting mechanism (4) is installed on the top of the lower mold (3). An upper lifting mechanism (5) is connected to the top of the upper mold (2). The output end of the telescopic cylinder (1) is connected to the upper lifting mechanism (5).

2. The parallel pinhole collimator according to claim 1, characterized in that: The lead alloy is adopted alloy.

3. A parallel pinhole collimator according to claim 1, characterized in that: The collimator has an aperture of 4mm, a wall thickness of 2mm, and a height of 59mm.

4. A parallel pinhole collimator according to claim 1, characterized in that: The casting device also includes a bottom plate (6) and a top plate (7), with a first side plate (8) and a second side plate (9) fixed between the bottom plate (6) and the top plate (7).

5. A parallel pinhole collimator according to claim 4, characterized in that: The casting device further includes the lower lifting mechanism (4), which includes a lower housing (10) fixed to the bottom of the lower mold (3). A sliding track (11) is fixed to the bottom of the inner cavity of the lower housing (10). A lower wedge block (12) is slidably connected to the sliding track (11). A lower push rod (13) is provided at the bottom of the lower mold (3). A lower moving wheel (14) is fixed to the bottom of the lower push rod (13). The lower moving wheel (14) contacts the upper surface of the lower wedge block (12). A first spring (15) is connected to one side wall of the block (12) and the inner wall of the lower housing (10). One end of a connecting rope (20) is connected to the other side of the lower wedge block (12). A guide wheel (16) is fixed to the side wall of the first side plate (8). A telescopic rod (17) is fixed to the bottom of the top plate (7). A lifting plate (18) is fixed to the bottom of the telescopic rod (17). The other end of the connecting rope (20) passes around the guide wheel (16) and is connected to the bottom end of the lifting plate (18).

6. A parallel pinhole collimator according to claim 5, characterized in that: The upper lifting mechanism (5) includes an upper housing (21) fixed to the top of the upper mold (2), a telescopic cylinder (1) fixed on the top plate (7), the output end of the telescopic cylinder (1) being fixedly connected to the top of the upper housing (21), and a lifting rod (19) located below the lifting plate (18) fixed on one side of the top of the upper housing (21).

7. A parallel pinhole collimator according to claim 6, characterized in that: The upper lifting mechanism (5) also includes an upper slide rail (22) fixed to the top of the inner cavity of the upper housing (21). An upper wedge block (23) is slidably connected to the upper slide rail (22). An upper push rod (24) is provided on the top of the upper mold (2). An upper moving wheel (25) is fixed to the top of the upper push rod (24). The upper moving wheel (25) contacts the lower surface of the upper wedge block (23). A guide plate (26) is fixed on the second side plate (9). A guide protrusion (27) is installed on the guide plate (26). A second spring (28) is connected to one side wall of the upper wedge block (23) and one side wall of the inner cavity of the upper housing (21). A movable rod (29) is fixed to the other side wall of the upper wedge block (23). A drive wheel (30) is fixed to one end of the movable rod (29) away from the upper wedge block (23).

8. A parallel pinhole collimator according to claim 7, characterized in that: A connecting plate (31) is fixed on both the upper ejector rod (24) and the lower ejector rod (13). A return spring (32) is connected between the connecting plate (31) of the upper ejector rod (24) and the upper mold (2), and between the connecting plate (31) of the lower ejector rod (13) and the lower mold (3).

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