Stair chain outer single link press-fitting die

Abstract

The utility model belongs to the technical field of step chains, and particularly relates to a step chain outer single link press-fitting die which comprises a lower die base, pin shaft fixing blocks and magnetic steel, the left end and the right end of the rear side of the top of the lower die base are connected with the pin shaft fixing blocks through supporting pieces respectively, and the front ends of the two pin shaft fixing blocks are provided with semi-arc-shaped clamping grooves used for being connected with pin shafts in a clamped mode respectively. Magnetic steel used for adsorbing a pin shaft is arranged at the groove bottom of the semi-arc-shaped clamping groove in the radial direction, a mandrel hole is coaxially formed in the position, opposite to the semi-arc-shaped clamping groove, of the top of the lower die base, and a positioning mandrel used for positioning an outer chain plate is installed in the mandrel hole. The device can effectively improve the assembly precision and the assembly efficiency of the outer single link of the step chain, and is convenient to carry and high in safety.

Description

TECHNICAL FIELD

[0001] The new type belongs to the technical field of step chain, and particularly relates to a step chain outer single-section press-fitting die. BACKGROUND

[0002] Step chain is a chain used for transmitting power and supporting steps or treads in escalators and moving walkways. It transmits power to steps through a traction drive system, enabling the steps to continuously circulate.

[0003] In the prior art, the step chain outer single-section press-fitting die has the following defects: 1. When the existing die is used to press-fit the pin shaft through a punch, the pin shaft and the outer chain plate lack accurate positioning, resulting in low manufacturing precision of the outer single section and easy damage of the parts; 2. The die has a large volume, which is inconvenient to carry; and 3. The main structure of the die has a certain degree of closure, which is inconvenient for part installation and quick removal of the outer single section after press fitting, resulting in low work efficiency and certain personal safety risks. CONTENT OF THE NEW TYPE

[0004] The new type discloses a step chain outer single-section press-fitting die, and aims to solve the problems 1-3 in the prior art.

[0005] To achieve the above-mentioned purpose, the technical scheme of the new type is as follows:

[0006] A step chain outer single-section press-fitting die, comprising a lower die seat, a pin shaft fixing block and a magnetic steel, left and right ends of the rear side of the top of the lower die seat are connected with the pin shaft fixing block through support members, the front ends of the two pin shaft fixing blocks are respectively provided with semicircular arc-shaped clamping grooves for clamping the pin shaft, the groove bottoms of the semicircular arc-shaped clamping grooves are provided with the magnetic steel for adsorbing the pin shaft along the radial direction, a core shaft hole coaxial with the semicircular arc-shaped clamping groove is arranged at the position opposite to the semicircular arc-shaped clamping groove on the top of the lower die seat, a positioning core shaft for positioning the outer chain plate is arranged in the core shaft hole, the distance between the bottom end of the pin shaft fixing block and the top end of the lower die seat is greater than the thickness of the outer chain plate, the height of the outer single section is H, the distance between the top end of the pin shaft fixing block and the top end of the lower die seat is L, and the thickness of the outer chain plate is M, and H-L is greater than M.

[0007] Preferably, the bottom end of the lower die seat is fixedly connected with an enclosing plate through a screw, the core shaft hole penetrates the lower die seat along the vertical direction, the positioning core shaft comprises a core shaft body and a compression spring, the core shaft body is slidably sleeved in the core shaft hole, the bottom end of the core shaft body is connected with the top end of the enclosing plate through the compression spring, the front and rear ends of the top of the core shaft body are respectively provided with flat tables one, the front and rear ends of the inner wall of the chain plate hole of the outer chain plate are respectively provided with flat tables two, and the front and rear ends of the end portion of the pin shaft are respectively provided with flat tables three, the flat tables one and three are respectively matched with the flat tables two, and the height of the top of the core shaft body exposed from the top end of the lower die seat in the natural state is less than the height of the chain plate hole of the outer chain plate.

[0008] Preferably, the portion of the mandrel body exposed above the lower mold base is chamfered, and the bottom edge of the pin has a chamfered structure. When the outer chain plate is installed, the height of the top of the outer chain plate is greater than the top of the mandrel body by the height of the chamfered structure.

[0009] Preferably, the lower mold base includes symmetrically arranged support blocks. Each of the two support blocks has a fixing groove at its rear end that faces each other. A connecting plate is inserted between the two fixing grooves. The connecting plate is fixedly connected to the fixing groove by bolts. The portion of the connecting plate within the fixing groove has longitudinally arranged connecting holes on its left and right sides, which penetrate the top of the support block. The support member is a spacer sleeve opposite to the top of the connecting hole. The top and bottom of the spacer sleeve abut against the bottom of the pin fixing block and the top of the support block, respectively. A positioning hole is vertically arranged on the pin fixing block where the top of the spacer sleeve is located. A positioning pin passes through the positioning hole, passing through the spacer sleeve and the connecting hole, fixing the pin positioning block, the lower mold base, and the connecting plate into an integral structure. The positioning pin and the spacer sleeve are tightly fitted together.

[0010] Preferably, the bottom of the semi-circular arc-shaped slot is provided with a magnet fixing hole along the front-back direction, and the top of the pin positioning block between the two positioning holes is provided with a threaded hole that passes through the magnet positioning hole. The magnet is fixedly connected to the pin positioning block by a positioning bolt passing through the threaded hole, and the end of the magnet is a curved surface structure coplanar with the semi-circular arc-shaped slot.

[0011] Preferably, the installation height of the magnet satisfies the following condition: when the bottom end of the pin, which is engaged in the semi-circular groove, is inserted into the chain plate hole of the outer chain plate and is not press-fitted, the end of the magnet is attracted to the middle of the pin and keeps the pin in a vertical position.

[0012] Preferably, bolt holes are provided on the left and right sides of the connecting plate between the two support blocks, and the bolt holes are used to fix the mold to the fixed seat on the press workbench.

[0013] The beneficial effects of this new type of single-section press-fit mold for ladder chain are as follows:

[0014] This new press-fitting mold can make the pin shaft perpendicular to the chain plate through magnetic positioning, which improves the accuracy of parts assembly. The open design reduces the mold material, makes loading and unloading convenient, and makes disassembly and assembly easy. The chamfered structure of the parts has been proven to achieve precise matching in practice, reducing part waste and defective parts. The portable design of the mold greatly reduces the mold assembly time and ensures the safety of employees. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the assembly structure of the present invention during operation;

[0016] Figure 2This is a three-dimensional structural diagram of the new mold;

[0017] Figure 3 This is a schematic diagram of the structure of the new type of pin and outer chain plate during positioning;

[0018] Figure 4 This is a schematic diagram of the positioning mandrel installation of this novel invention;

[0019] Figure 5 This is a top view schematic diagram of the structure of this novel invention.

[0020] Reference numerals: 1-Pin fixing block, 2-Spacer sleeve, 3-Lower mold base, 4-Positioning hole, 5-Threaded hole, 6-Magnet fixing hole, 7-Semi-circular arc groove, 8-Mandrel body, 9-Connecting plate, 10-Chamfered edge of groove, 11-Chain plate hole, 12-Flat platform three, 13-Outer chain plate, 14-Pin, 15-Magnet, 16-Pressed outer chain plate, 17-Curved surface structure, 18-Pin bottom chamfered insertion position, 19-Mandrel hole, 20-Sealing plate, 21-Fixing groove, 22-Bolt hole. Detailed Implementation

[0021] The following description is merely a preferred embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

[0022] The following embodiments can be understood as representing a part of the local structure or method of the present invention, or as a combination of embodiments explaining the broader structure or method of the present invention.

[0023] Example 1

[0024] A single-section press-fit die for a ladder chain, such as Figures 1-5 As shown, the assembly includes a lower mold base 3, a pin fixing block 1, and a magnet 15. The left and right ends of the rear top of the lower mold base 3 are respectively connected to the pin fixing blocks 1 via support members. The front ends of the two pin fixing blocks 1 are respectively provided with semi-circular arc-shaped grooves 7 for engaging the pins (i.e., the radius of the semi-circular arc-shaped grooves is the same as that of the pins). The bottom of the semi-circular arc-shaped grooves 7 is provided with magnets 15 for attracting the pins along the radial direction. The top of the lower mold base 3 is coaxially provided with a mandrel hole 19 opposite to the semi-circular arc-shaped grooves 7. A positioning mandrel for positioning the outer link plate 13 is installed in the mandrel hole 19. The distance between the bottom end of the pin fixing block 1 and the top end of the lower mold base 3 is greater than the thickness of the outer link plate, so as to make room for the edge of the outer link plate during press fitting. Let the height of the outer single section be H, the distance between the top end of the pin fixing block 1 and the top end of the lower mold base 3 be L, and the thickness of the outer link plate 13 be M. HL≥M, to ensure that the top of the pin fixing block will not interfere with the press fitting.

[0025] In this embodiment, the lower mold base can be an integral structure or a structure formed by connecting two support blocks as described in the following embodiments. The positioning mandrel and the semi-circular arc groove 7 ensure the matching accuracy of parts by positioning the outer chain plate and the pin. The magnet attracts the pin, keeping the pin stable during the press-fitting process. At the same time, it cooperates with the semi-circular arc groove to ensure that the pin fits tightly in the vertical direction within the semi-circular arc groove, further ensuring assembly accuracy. The semi-circular arc groove of this novel invention is an open structure, which can significantly improve the installation speed of parts such as pins. After press-fitting, the outer single section can naturally pop out under the action of the positioning mandrel, improving the material discharge efficiency.

[0026] Example 2

[0027] like Figures 1-5 As shown, the bottom end of the lower mold base 3 is fixedly connected to the sealing plate 20 by screws. The mandrel hole 19 penetrates the lower mold base 3 vertically. The positioning mandrel includes a mandrel body 8 and a compression spring (a common structure, not shown in the figure). The mandrel body 8 is slidably sleeved in the mandrel hole 19. The bottom end of the mandrel body 8 is connected to the top end of the sealing plate 20 by the compression spring. The front and rear ends of the top of the mandrel body 8 are respectively provided with a flat platform (e.g., Figure 2 As shown), the front and rear ends of the inner wall of the chain plate hole 11 of the outer chain plate 13 are respectively provided with two flat platforms (such as...). Figure 1 As shown), the front and rear ends of the pin shaft 14 are respectively provided with flat platform three 12. The flat platform one and flat platform three 12 are respectively engaged with flat platform two. In the natural state, the height of the top of the mandrel body 8 exposed above the top of the lower mold base 3 is less than the height of the chain plate hole 11 of the outer chain plate 13.

[0028] Example 3

[0029] As a further improvement, in this embodiment, such as Figure 1 As shown, the portion of the spindle body 8 exposed above the lower mold base 3 is chamfered to avoid damaging the inner wall of the chain plate hole. The bottom edge of the pin 14 is chamfered. When the outer chain plate is installed, the height of the top of the outer chain plate is greater than the top of the spindle body by the height of the chamfer structure, so as to facilitate the initial positioning of the pin end and make the pin end contact the top of the spindle body.

[0030] Example 4

[0031] like Figures 1-5As shown, the lower mold base 3 includes symmetrically arranged support blocks. The rear ends of the two support blocks are provided with fixing grooves 21 that are opposite to each other. A connecting plate 9 is inserted between the two fixing grooves 21. The connecting plate 9 is fixedly connected to the fixing grooves 21 by bolts. The portion of the connecting plate 9 located in the fixing grooves 21 has connecting holes (not shown in the figure) on its left and right sides along the longitudinal direction. The connecting holes penetrate the top of the support blocks. The support member is a spacer sleeve 2 opposite to the top of the connecting holes. The top and bottom of the spacer sleeve 2 abut against the bottom of the pin fixing block 1 and the top of the support block, respectively. The pin fixing block 1 where the top of the spacer sleeve 2 is located has a positioning hole 4 along the vertical direction. A positioning pin passes through the positioning hole 4. The positioning pin passes through the spacer sleeve and the connecting hole, fixing the pin positioning block 1, the lower mold base 3, and the connecting plate 9 into an integral structure. The positioning pin and the spacer sleeve 2 are tightly fitted together. The connecting plate is used to ensure that the spacing between the two spindle holes is consistent with the spacing between the holes on the outer chain plate. The support sleeve is used to raise the pin positioning block to a certain height so that it can make way for the lower chain plate and to ensure that the semi-circular arc groove and magnet stably position the pin.

[0032] like Figure 2 As shown, the bottom of the semi-circular arc-shaped slot 7 is provided with a magnet fixing hole 6 along the front-back direction. The top of the pin positioning block 1 between the two positioning holes 4 is provided with a threaded hole 5 that passes through the magnet positioning hole 6. The magnet 15 is fixedly connected to the pin positioning block 1 by a positioning bolt passing through the threaded hole. The end of the magnet 15 is a curved surface structure 17 that is coplanar with the semi-circular arc-shaped slot 7, which facilitates more secure adsorption of the pin.

[0033] like Figure 1 As shown, the installation height of the magnet 15 satisfies the following condition: when the bottom end of the pin 14, which is engaged in the semi-circular groove 7, is inserted into the chain plate hole 11 of the outer chain plate 13 and is not press-fitted, the end of the magnet 15 is attracted to the middle of the pin 14 and keeps the pin in a vertical position. This setting can avoid assembly errors caused by uneven force on the upper and lower parts of the pin, further improve the installation accuracy, and avoid damage to parts.

[0034] like Figure 4 As shown, bolt holes 22 are provided on the left and right sides of the connecting plate 9 between the two support blocks. The bolt holes 22 are used to fix the mold to the fixed seat on the press workbench.

[0035] The working principle of this new type:

[0036] In use, the mold is fixed on the fixed base of the punch press worktable. The positioning chain plate hole is located through the mandrel body. Since the flat platform one of the mandrel body and the flat platform two of the chain plate hole cooperate, the outer chain plate is accurately positioned. The chamfered structure at the bottom end of the pin is inserted into the chain plate hole and abuts against the top end of the mandrel body, so that the pin is locked into the semi-circular arc groove and fixed by magnetic attraction. After both pins are positioned, the punch press is started. The punch simultaneously applies vertical pressure to the ends of the two pins, pressing the bottom ends of the two pins into the two chain plate holes. Then, the punch is reset, and the pressed part is ejected by the mandrel body. The pressed part is reversed, and another outer chain plate is pressed in, thus completing the entire outer single-section pressing.

Claims

1. A single-section press-fit die for a ladder chain, characterized in that: The device includes a lower mold base, pin fixing blocks, and magnets. The left and right ends of the rear top of the lower mold base are respectively connected to pin fixing blocks via support members. The front ends of the two pin fixing blocks are respectively provided with semi-circular arc-shaped grooves for engaging the pins. The bottom of the semi-circular arc-shaped grooves is provided with magnets for attracting the pins radially. The top of the lower mold base is coaxially provided with a mandrel hole opposite to the semi-circular arc-shaped grooves. A positioning mandrel for positioning the outer link plate is installed in the mandrel hole. The distance between the bottom end of the pin fixing block and the top end of the lower mold base is greater than the thickness of the outer link plate. Let the height of the outer link be H, the distance between the top end of the pin fixing block and the top end of the lower mold base be L, and the thickness of the outer link plate be M, where HL≥M.

2. The single-section press-fitting mold for a ladder chain as described in claim 1, characterized in that: The bottom end of the lower mold base is fixedly connected to a sealing plate by screws. The mandrel hole penetrates the lower mold base vertically. The positioning mandrel includes a mandrel body and a compression spring. The mandrel body is slidably sleeved in the mandrel hole. The bottom end of the mandrel body is connected to the top end of the sealing plate by the compression spring. The front and rear ends of the top of the mandrel body are respectively provided with a flat platform one. The front and rear ends of the inner wall of the chain plate hole of the outer chain plate are respectively provided with a flat platform two. The front and rear ends of the pin end are respectively provided with a flat platform three. The flat platform one and the flat platform three are respectively engaged with the flat platform two. In the natural state, the height of the top of the mandrel body protruding from the top of the lower mold base is less than the height of the chain plate hole of the outer chain plate.

3. The single-section press-fitting mold for a ladder chain as described in claim 2, characterized in that: The portion of the mandrel body exposed above the lower mold base is chamfered, and the bottom edge of the pin shaft has a chamfered structure. When the outer chain plate is installed, the height of the top of the outer chain plate is greater than the top of the mandrel body by the height of the chamfered structure.

4. The single-section pressing mold for a ladder chain as described in claim 3, characterized in that: The lower mold base includes symmetrically arranged support blocks. Each of the two support blocks has a fixing groove at its rear end that faces each other. A connecting plate is inserted between the two fixing grooves. The connecting plate is fixedly connected to the fixing groove by bolts. The portion of the connecting plate within the fixing groove has longitudinally arranged connecting holes on its left and right sides, which penetrate the top of the support block. The support member is a spacer sleeve opposite to the top of the connecting hole. The top and bottom of the spacer sleeve abut against the bottom of the pin fixing block and the top of the support block, respectively. A positioning hole is vertically arranged on the pin fixing block where the top of the spacer sleeve is located. A positioning pin passes through the positioning hole, passing through the spacer sleeve and the connecting hole, fixing the pin positioning block, the lower mold base, and the connecting plate into a single structure. The positioning pin and the spacer sleeve are tightly fitted together.

5. The single-section press-fitting mold for a ladder chain as described in claim 4, characterized in that: The bottom of the semi-circular arc-shaped slot is provided with a magnet fixing hole along the front-back direction. The top of the pin positioning block between the two positioning holes is provided with a threaded hole that passes through the magnet positioning hole. The magnet is fixedly connected to the pin positioning block by a positioning bolt passing through the threaded hole. The end of the magnet is a curved surface structure that is coplanar with the semi-circular arc-shaped slot.

6. The single-section press-fitting mold for a ladder chain as described in claim 5, characterized in that: The installation height of the magnet is such that when the bottom end of the pin, which is engaged in the semi-circular groove, is inserted into the chain plate hole of the outer chain plate and is not press-fitted, the end of the magnet is attracted to the middle of the pin and keeps the pin in a vertical position.

7. The single-section press-fitting mold for a ladder chain as described in claim 6, characterized in that: Bolt holes are provided on the left and right sides of the connecting plate between the two support blocks. The bolt holes are used to fix the mold to the fixed seat on the press workbench.

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