Injection punch and injection device

Abstract

According to the injection punch and the injection device, the injection punch comprises a punch body and an injection rod connecting piece, the injection rod connecting piece is inserted into the punch body, the tail of the injection rod connecting piece is located outside the punch body, and the injection punch further comprises a plurality of threaded fasteners used for fixing the tail of the injection rod connecting piece to the tail of the punch body. According to the punch, the punch body and the injection rod connecting piece are connected through the threaded fasteners, the mode that the punch body and the injection rod connecting piece are connected through the internal threads and the external threads in the prior art is replaced, and compared with the prior art, the diameter of the threads is smaller; the problem that in the prior art, once a thread slightly deforms, the punch body is difficult to detach and replace is solved, and meanwhile the threaded fastener still keeps convenience and reliability of threaded connection.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of injection punch, injection device, belong to the injection technology field of die casting machine. BACKGROUND

[0002] Die casting machine is a kind of casting equipment by injection punch to certain pressure and speed with liquid aluminum and other metal liquid extruded into the cavity of mould to form metal casting.

[0003] The Chinese patent with the authorization announcement number CN 222385880 U discloses a snap ring punch for die casting machine, comprising a punch body, a pressure end is fixedly arranged on the top of the punch body, a connecting end is arranged on the bottom of the punch body, a cooling cavity is arranged in the punch body, a through hole is arranged in the connecting end, the through hole is communicated with the cooling cavity, a first sealing assembly is arranged on the pressure end, a second sealing assembly is arranged on the punch body, the first sealing assembly and the second sealing assembly are used for sealing between the punch body and the pressure end; a first internal thread is arranged on the inner wall of the bottom of the punch body, an external thread is arranged on the top of the connecting end, the external thread is matched with the first internal thread, so as to fix the punch body and the connecting end.

[0004] The applicant finds that there is still the following problem: after the punch is used for a long time, the punch body is difficult to be conveniently taken off from the pressure end for replacement due to slight deformation of the thread. UTILITY MODEL CONTENT

[0005] In view of the deficiencies of the prior art, the present application provides a kind of injection punch, injection device, solve the problem that the punch body of the punch of prior art is difficult to be conveniently taken off for replacement after long time use.

[0006] An injection punch comprises a punch body and an injection rod connecting piece, the injection rod connecting piece is inserted into the punch body and the tail of the injection rod connecting piece is located outside the punch body, the injection punch further comprises a plurality of threaded fasteners for fixing the tail of the injection rod connecting piece to the tail of the punch body.

[0007] Preferably, the threaded fastener is a fastening screw, and a fastening hole is arranged on the tail end surface of the punch body for connecting with the fastening screw.

[0008] Preferably, a plurality of positioning notches are further arranged on the tail end surface of the punch body, a plurality of positioning columns are arranged on the surface of the injection rod connecting piece facing the tail end surface of the punch body and matched with the plurality of positioning notches, and the positioning columns abut against the groove bottoms corresponding to the positioning notches.

[0009] The positioning notches are arranged in the circumferential direction of the punch body and staggered with the fastening holes.

[0010] The ratio of the slot width of the positioning slot to the wall thickness at the tail end of the punch body is 1:3 to 1:2.

[0011] The threaded fastener is a nut, and a stud portion for connecting with the nut is arranged on the tail end face of the punch body, the stud portion passes through the tail end of the injection rod connector, and the thread on the stud portion is exposed to the outside of the tail end of the injection rod connector.

[0012] The diameter of the stud portion is equal to the wall thickness at the tail end of the punch body.

[0013] The punch body has a plug-in hole for plugging the injection rod connector, the interior of the punch body is provided with a cooling cavity communicating with the plug-in hole, and the head portion of the injection rod connector is provided with a plurality of sealing grooves for mounting sealing rings.

[0014] A kind of injection device, including cylinder and the injection punch moving in the cylinder, the injection punch is the injection punch in any of the above technical solutions.

[0015] In conclusion, the utility model has the following beneficial effects:

[0016] 1: the utility model discloses a plurality of threaded fasteners are used for connecting the punch body and the injection rod connector, replace the mode that the punch body and the injection rod connector are connected by internal and external threads in the prior art, relative to the prior art, the diameter of the thread involved is smaller, it means that the distance of thread advancement is shorter when rotating a circle, even if deformation is also relatively easy to unscrew, avoid the problem that the punch body is difficult to conveniently dismount and replace in the prior art when the thread is slightly deformed, and the threaded fastener still retains the convenience and reliability of threaded connection.

[0017] 2: the utility model discloses that the tail end face of the punch body and the face of the injection rod connector facing the tail end face of the punch body are provided with positioning slot and positioning column matched with each other, so that when the injection rod connector and the punch body are fixedly connected by using the fastening screw, the hole (not shown in the drawing) on the injection rod connector for the fastening screw to pass through is axially aligned with the fastening screw hole quickly, so that the fastening screw is connected to the fastening screw hole conveniently;The positioning column abuts against the groove bottom of the positioning slot, shares and reduces the axial force transmitted from the punch body to the thread when the injection punch extrudes the metal liquid, slows down the deformation of the thread, so that the problem that the thread is relatively easy to damage when small-diameter thread connection is used to replace the large-diameter thread connection in the prior art is overcome.

[0018] 3: The utility model discloses a threaded fastener adopts the screw cap, and the thread of the stud part arranged on the tail end face of punch body tail is exposed to the tail of the injection rod connecting piece, and the thread is in the state of obvious visibility, which is convenient for the screw cap to align the thread on the stud part, so that the screw cap is conveniently screwed on the stud part, the diameter of the stud part is equal to the wall thickness at the tail of the punch body, the diameter of the stud part is maximized, and the strength of the stud part is ensured. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of the first injection punch.

[0020] Figure 2 It is an exploded view of the injection punch. Figure 1

[0021] Figure 3 It is a sectional view of the injection punch. Figure 1

[0022] It is a sectional view of the second injection punch. Figure 4

[0023] It is a structural diagram of the injection rod connecting piece. Figure 5 Figure 4 It is a structural schematic diagram of the third injection punch.

[0024] Figure 6

[0025] Figure 7 It is an exploded view of the injection punch. Figure 6 DETAILED DESCRIPTION

[0026] The utility model will be further described through specific embodiments in combination with the drawings.

[0027] Example 1:

[0028] An injection punch, such as Figures 1-3 ​​​​As shown, the device includes a punch body 1 and an injection rod connector 2. The injection rod connector 2 is inserted into the punch body 1, with its tail portion located outside the punch body 1. The punch body 1 has an insertion hole 10 for inserting the injection rod connector 2. Multiple fastening screw holes 12 are provided on the tail end face of the punch body 1, arranged circumferentially around the central axis of the punch body 1. Multiple fastening screws 3 are provided at the tail of the injection rod connector 2. The fastening screws 3 pass through the injection rod connector 2 and are screwed into the corresponding fastening screw holes 12, thereby fixing the tail of the injection rod connector 2 to the tail of the punch body 1. This achieves the connection between the punch body 1 and the injection rod connector 2, replacing the previous method where the punch body 1 and the injection rod connector 2 were connected in a single, continuous manner. The connection between the injection rod connector 2 and the external thread is smaller in diameter than that of the prior art. This means that the thread travels a shorter distance with each rotation, and it is relatively easy to unscrew even if it is deformed. This avoids the problem in the prior art where slight deformation of the thread makes it difficult to remove and replace the punch body 1. At the same time, it still retains the convenience and reliability of the threaded connection. In the prior art, the connection between the punch body 1 and the injection rod connector 2 is made with a large thread diameter. After long-term use, slight deformation of the thread makes it difficult to remove the punch body 1 from the pressing end for replacement.

[0029] The punch body 1 has a cooling chamber 11 that communicates with the insertion hole 10. The injection rod connector 2 has an internal threaded hole for connecting the injection rod. When the injection rod connector 2 is spirally connected to the injection rod containing the water inlet pipe, the cooling water in the water inlet pipe enters the cooling chamber 11 after passing through the insertion hole 10, which reduces the temperature of the punch body 1 in time and reduces the damage of the high-temperature molten metal to the punch body 1. The head of the injection rod connector 2 is provided with several sealing grooves 21. After the sealing ring is installed in the sealing groove 21, it forms a seal with the insertion hole 10 of the punch body 1, which can effectively isolate the cooling water that is introduced into the cooling chamber 11.

[0030] A raised ring 13 is provided on the outer wall near the head of the punch body 1. The tail of the injection rod connector 2 protrudes radially from the punch body 1. Several sealing rings 14 are fitted on the punch body 1 between the raised ring 13 and the tail of the injection rod connector 2. When the tail of the injection rod connector 2 is fixed to the tail of the punch body 1, it also presses against the sealing rings 14. The sealing rings 14 can be made of copper or steel. As described in the prior art, the punch moves linearly in the barrel to press the molten metal into the mold. The sealing rings 14 increase the sealing between the punch and the barrel. At the same time, the sealing rings 14 that fit against the barrel are easy to replace without replacing the entire punch.

[0031] Example 2:

[0032] Example 2 relates to a pressure injection punch, which is a further improvement on the pressure injection punch in Example 1, such as... Figures 4-5 As shown, the tail end face of the punch body 1 is also provided with a number of positioning slots 16. The positioning slots 16 are located in the circumferential direction of the punch body 1 and are staggered with the fastening screw holes 12, so that there is a positioning slot 16 between every two adjacent fastening screw holes 12. The ratio of the width of the positioning slot 16 to the wall thickness at the tail of the punch body 1 is 1:3 to 1:2. The surface of the injection rod connector 2 facing the tail end of the punch body 1 is provided with a positioning post 22 that cooperates with the positioning slot 16, and the positioning post 22 abuts against the bottom of the positioning slot 16.

[0033] On the one hand, the presence of the positioning post 22 and the positioning slot 16 makes it easier for the hole on the injection rod connector 2 through which the fastening screw 3 passes (not shown in the attached figure) to be quickly axially aligned with the fastening screw hole 12 when the fastening screw 3 is fixedly connected to the injection rod connector 2 and the punch body 1. This facilitates the connection of the fastening screw 3 to the fastening screw hole 12. On the other hand, the positioning post 22 abuts against the bottom of the positioning slot 16, which reduces the axial force transmitted from the punch body 1 to the thread when the injection punch squeezes the molten metal, thus slowing down the thread deformation and overcoming the problem that the thread is relatively easy to be damaged when a small diameter thread connection is used instead of the large diameter thread connection in the prior art.

[0034] Example 3:

[0035] Example 3 relates to an injection punch, which differs from the injection punch in Example 1 in that:

[0036] like Figures 6-7As shown, the tail end face of the punch body 1 is provided with multiple studs 15. The multiple studs 15 are arranged in a circle around the central axis of the punch body 1. The studs 15 pass through the tail of the injection rod connector 2. A nut 4 is provided on the stud 15. By tightening the nut 4, the tail of the injection rod connector 2 is fixed to the tail of the punch body 1, thereby realizing the connection between the punch body 1 and the injection rod connector 2. Similar to Embodiment 1, Embodiment 2 replaces the prior art method of connecting the punch body 1 and the injection rod connector 2 via internal and external threads. Compared to the prior art, the threaded connection in this embodiment involves a smaller thread diameter, meaning that the distance the thread travels per revolution is shorter. Even if deformed, it is relatively easy to unscrew, avoiding the problem in the prior art where slight deformation of the thread makes it difficult to easily remove and replace the punch body 1. At the same time, it still retains the convenience and reliability of the threaded connection. In contrast, the prior art method of connecting the punch body 1 and the injection rod connector 2 via internal and external threads has a large thread diameter. After prolonged use, slight deformation of the thread makes it difficult to easily remove the punch body 1 from the pressing end for replacement. Moreover, the thread of the stud portion 15 protrudes beyond the tail of the injection rod connector 2, making the thread clearly visible, which facilitates the alignment of the nut 4 with the thread on the stud portion 15, thus making it easy to screw onto the stud portion 15.

[0037] In this embodiment, the diameter of the stud portion 15 is equal to the wall thickness at the tail of the punch body 1, thereby maximizing the diameter of the stud portion 15 and ensuring the strength of the stud portion 15.

[0038] Example 4:

[0039] An injection apparatus, as in the prior art, includes a barrel and an injection punch that moves within the barrel; however, the injection punch is the injection punch of Embodiment 1, Embodiment 2, or Embodiment 3.

[0040] The above embodiments are merely descriptions of preferred embodiments of the present invention and are not intended to limit the concept and scope of the present invention. Various modifications and improvements made to the technical solutions of the present invention by those skilled in the art without departing from the design concept of the present invention should fall within the protection scope of the present invention. The technical content for which protection is sought in the present invention has been fully described in the claims.

Claims

1. A pressure injection punch, comprising a punch body (1) and a pressure injection rod connector (2), characterized in that, The injection rod connector (2) is inserted into the punch body (1) and its tail is located outside the punch body (1). The injection punch also includes a plurality of threaded fasteners for securing the tail of the injection rod connector (2) to the tail of the punch body (1).

2. The injection punch according to claim 1, characterized in that, The threaded fastener is a fastening screw (3); the tail end face of the punch body (1) is provided with a fastening screw hole (12) for connecting with the fastening screw (3).

3. The injection punch according to claim 2, characterized in that, The punch body (1) is provided with a number of positioning slots (16) on its tail end face. The injection rod connector (2) is provided with a number of positioning posts (22) on its surface facing the tail end face of the punch body (1) to cooperate with the number of positioning slots (16). The positioning posts (22) abut against the bottom of the corresponding positioning slots (16).

4. The injection punch according to claim 3, characterized in that, The positioning slot (16) is located in the circumferential direction of the punch body (1) and is staggered with the fastening screw hole (12).

5. The injection punch according to claim 3, characterized in that, The ratio of the width of the positioning slot (16) to the wall thickness at the tail of the punch body (1) is 1:3 to 1:

2.

6. The injection punch according to claim 1, characterized in that, The threaded fastener is a nut (4). The tail end face of the punch body (1) is provided with a stud part (15) for connecting with the nut (4). The stud part (15) passes through the tail of the injection rod connector (2), and the thread on the stud part (15) protrudes beyond the tail of the injection rod connector (2).

7. The injection punch according to claim 6, characterized in that, The diameter of the stud portion (15) is equal to the wall thickness at the tail of the punch body (1).

8. The injection punch according to claim 1, characterized in that, The punch body (1) has an insertion hole (10) for inserting the injection rod connector (2). The interior of the punch body (1) is provided with a cooling cavity (11) communicating with the insertion hole (10). The head of the injection rod connector (2) is provided with several sealing grooves (21) for installing a sealing ring.

9. An injection apparatus comprising a barrel and an injection punch that moves within the barrel, characterized in that, The injection punch is the injection punch described in any one of claims 1 to 8.

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