Ink amount observation device for web offset press

Abstract

The utility model discloses an ink amount observation device for web offset press, including lamp body subassembly, lamp body subassembly sets up the printing unit top, and the printing unit one side sets up the reflection subassembly, and the light of lamp body subassembly is reflected to the reflection subassembly, and the reflection subassembly realizes the light reflection of printing unit ink amount. The utility model has solved the problem of low work efficiency of observing ink amount in the prior art.

Description

Technical Field

[0001] This utility model belongs to the technical field of web printing presses and relates to an ink volume monitoring device for web offset printing presses. Background Technology

[0002] Because roll-to-roll offset printing machines are relatively tall, staff need to climb to higher positions using footboards and stairs to operate and control the ink volume. However, the real-time requirements for ink volume control are very high. Staff repeatedly stepping on footboards or climbing ladders to observe the ink volume is difficult to meet the increasingly fast printing speed requirements. Frequent climbing to observe the ink volume poses certain safety hazards and results in low work efficiency. Utility Model Content

[0003] The purpose of this invention is to provide an ink volume observation device for web offset printing machines, which solves the problem of low efficiency in ink volume observation in the prior art.

[0004] The technical solution adopted by this utility model is an ink volume observation device for a web offset printing machine, including a lamp assembly, which is set above the printing unit. A reflective component is set on one side of the printing unit. The light emitted by the lamp assembly is reflected by the reflective component, which realizes focused reflection of the ink volume of the printing unit.

[0005] The features of this utility model also include: The printing unit includes a drive surface wall panel and an operating surface wall panel. Two paper guide roller supports are arranged opposite each other above the drive surface wall panel and the operating surface wall panel. A lamp assembly is arranged between the two paper guide roller supports and is located above the ink fountain area. An ink fountain is set in the ink fountain area. A reflective assembly is installed on the top of the drive surface wall panel.

[0006] The lamp body assembly includes a connector, which is positioned between two paper guide roller supports. A lamp holder is located in the center of the lower surface of the connector, and a lamp source is mounted on the lamp holder. The ink fountain is located directly below the lamp holder.

[0007] The reflective assembly includes a mirror mount, a paper guide roller support below a transmission surface wall panel of the printing unit, and an operation surface wall panel below another paper guide roller support. The mirror mount is installed on top of the transmission surface wall panel of the printing unit, and an observation mirror is installed on the mirror mount. The mirror surface of the observation mirror is tilted downwards, and the light source is located above the ink fountain. The illumination direction of the light source forms an acute angle with the observation direction of the mirror surface.

[0008] The mirror mount has an inverted L-shaped cross section, which includes a vertical part and a horizontal part. The vertical part is fixedly connected to the upper part of the transmission surface wall of the printing unit, and the horizontal part is equipped with an angle adjustment mechanism at the end, which is rotatably connected to the observation mirror.

[0009] The angle adjustment mechanism includes a double-ear bracket, which is located on both sides of the horizontal end of the inverted L-shaped section. Rotary holes are correspondingly formed on the double-ear bracket, and rotating shafts are fitted into these holes. The axial extension direction of the rotating shafts is perpendicular to the length direction of the connecting body. Several pin holes are evenly distributed around the rotating holes on the double-ear bracket. Two protruding connecting seats are vertically positioned at the center of the back of the observation mirror, with corresponding through holes on each of the two protruding connecting seats. The rotating shaft extends through and out of the through holes, and a bushing is fixed to the outside of the through holes. Arc-shaped grooves are formed around the through holes on the two protruding connecting seats, with the center of the arc-shaped grooves coinciding with the center of the through holes. Pins are fitted into the arc-shaped grooves, and the pins extend into the corresponding pin holes on the double-ear bracket for fixation.

[0010] The lamp holder uses an adjustable angle mounting bracket, which is fitted with a locking screw.

[0011] The connecting body adopts a connecting beam or connecting shaft with internal threads at both ends, and the connecting body 5 is made of steel.

[0012] The beneficial effects of this utility model are: the ink volume observation device for web offset printing machines is low in cost and easy to install. It allows for observation of ink volume in the ink fountain without the need for climbing, saving adjustment time, improving work efficiency, and enhancing print quality; it also plays an important role in improving the overall performance of the machine. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the ink volume observation device for a web offset printing machine according to the present invention. Figure 2 yes Figure 1 Cross-sectional view of the operating surface.

[0014] In the diagram, 1. Transmission panel, 2. Mirror mount, 3. Observation mirror, 4. Paper guide roller bracket, 5. Connector, 6. Light source, 7. Lamp holder, 8. Operation panel, 9. Ink fountain. Detailed Implementation

[0015] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0016] Example 1 The structure of this utility model for an ink volume observation device in a web offset printing machine is as follows: Figure 1 As shown, it includes a lamp body assembly, which is positioned above the printing unit. A reflective component is positioned on one side of the printing unit. The light emitted by the lamp body assembly is reflected by the reflective component, which achieves focused reflection of the ink volume in the printing unit.

[0017] Example 2 This utility model relates to an ink volume observation device for a web offset printing machine, comprising a lamp assembly positioned above the printing unit. A reflective component is located on one side of the printing unit. The light emitted by the lamp assembly is reflected by the reflective component, which focuses and reflects the ink volume of the printing unit. Based on Embodiment 1, in this embodiment, the printing unit includes a transmission surface wall plate 1 and an operation surface wall plate 8, such as... Figure 2 As shown, two paper guide roller supports 4 are arranged opposite each other above the transmission wall panel 1 and the operation wall panel 8. A lamp assembly is arranged between the two paper guide roller supports 4. The lamp assembly is located above the ink fountain area, and an ink fountain 9 is arranged in the ink fountain area. A reflector is installed on the top of the transmission wall panel 1.

[0018] Example 3 This utility model relates to an ink volume observation device for a web offset printing machine, comprising a lamp assembly positioned above the printing unit. A reflective component is located on one side of the printing unit. Light emitted from the lamp assembly is reflected by the reflective component, which focuses and reflects the ink volume of the printing unit. The printing unit includes a drive surface wall plate 1 and an operating surface wall plate 8. Two guide roller supports 4 are positioned opposite each other above the drive surface wall plate 1 and the operating surface wall plate 8. The lamp assembly is positioned between the two guide roller supports 4 and is located above the ink fountain area, where an ink fountain 9 is located. A reflective component is installed on the top of the drive surface wall plate 1. Based on embodiment 2, in this embodiment, the lamp assembly includes a connecting body 5 positioned between the two guide roller supports 4. A lamp holder 7 is located in the middle of the lower surface of the connecting body 5, and a lamp source 6 is installed on the lamp holder 7. The ink fountain 9 is located directly below the lamp holder 7.

[0019] Example 4 This utility model relates to an ink volume observation device for a web offset printing machine, comprising a lamp assembly positioned above the printing unit. A reflector is positioned on one side of the printing unit, and the light emitted by the lamp assembly is reflected by the reflector, which focuses and reflects the ink volume of the printing unit. The printing unit includes a drive surface wall plate 1 and an operating surface wall plate 8. Two guide roller supports 4 are positioned opposite each other above the drive surface wall plate 1 and the operating surface wall plate 8, and the lamp assembly is positioned between the two guide roller supports 4. The lamp assembly is located above the ink fountain area, where an ink fountain 9 is located. A reflector is installed on the top of the drive surface wall plate 1. The lamp assembly includes a connecting body 5 positioned between the two guide roller supports 4. A lamp holder 7 is positioned in the middle of the lower surface of the connecting body 5, and a lamp source 6 is mounted on the lamp holder 7. The ink fountain 9 is located directly below the lamp holder 7. Based on embodiment 3, the reflective component in this embodiment includes a mirror base 2, a paper guide roller bracket 4 with a transmission surface wall plate 1 of the printing unit below it, and an operation surface wall plate 8 with another paper guide roller bracket 4 below it. The mirror base 2 is installed on the top of the transmission surface wall plate 1 of the printing unit, and an observation mirror 3 is installed on the mirror base 2. The mirror surface of the observation mirror 3 is tilted downwards, and the light source 6 is located above the ink fountain 9. The illumination direction of the light source 6 forms an acute angle with the observation direction of the mirror surface of the observation mirror 3.

[0020] Example 5 This utility model relates to an ink volume observation device for a web offset printing machine, comprising a lamp assembly positioned above the printing unit. A reflector is positioned on one side of the printing unit, and the light emitted by the lamp assembly is reflected by the reflector, which focuses and reflects the ink volume of the printing unit. The printing unit includes a drive surface wall plate 1 and an operating surface wall plate 8. Two guide roller supports 4 are positioned opposite each other above the drive surface wall plate 1 and the operating surface wall plate 8, and the lamp assembly is positioned between the two guide roller supports 4. The lamp assembly is located above the ink fountain area, where an ink fountain 9 is located. A reflector is installed on the top of the drive surface wall plate 1. The lamp assembly includes a connecting body 5 positioned between the two guide roller supports 4. A lamp holder 7 is positioned in the middle of the lower surface of the connecting body 5, and a lamp source 6 is mounted on the lamp holder 7. The ink fountain 9 is located directly below the lamp holder 7. The reflective assembly includes a mirror base 2, a paper guide roller bracket 4 with a transmission surface wall plate 1 of the printing unit below it, and an operation surface wall plate 8 below another paper guide roller bracket 4. The mirror base 2 is installed on top of the transmission surface wall plate 1 of the printing unit, and an observation mirror 3 is installed on the mirror base 2. The mirror surface of the observation mirror 3 is tilted downwards, and the lamp source 6 is located above the ink fountain 9. The illumination direction of the lamp source 6 forms an acute angle with the observation direction of the mirror surface of the observation mirror 3. Based on embodiment 4, in this embodiment, the mirror base 2 has an inverted L-shaped cross-section, which includes a vertical part and a horizontal part. The vertical part is fixedly connected to the transmission surface wall plate 1 of the printing unit, and an angle adjustment mechanism is provided at the end of the horizontal part. The angle adjustment mechanism is rotatably connected to the observation mirror 3.

[0021] Example 6 This utility model relates to an ink volume observation device for a web offset printing machine, comprising a lamp assembly positioned above the printing unit. A reflector is positioned on one side of the printing unit, and the light emitted by the lamp assembly is reflected by the reflector, which focuses and reflects the ink volume of the printing unit. The printing unit includes a drive surface wall plate 1 and an operating surface wall plate 8. Two guide roller supports 4 are positioned opposite each other above the drive surface wall plate 1 and the operating surface wall plate 8, and the lamp assembly is positioned between the two guide roller supports 4. The lamp assembly is located above the ink fountain area, where an ink fountain 9 is located. A reflector is installed on the top of the drive surface wall plate 1. The lamp assembly includes a connecting body 5 positioned between the two guide roller supports 4. A lamp holder 7 is positioned in the middle of the lower surface of the connecting body 5, and a lamp source 6 is mounted on the lamp holder 7. The ink fountain 9 is located directly below the lamp holder 7. The reflective assembly includes a mirror base 2, a paper guide roller bracket 4 with a transmission surface wall plate 1 of the printing unit below it, and an operation surface wall plate 8 below the other paper guide roller bracket 4. The mirror base 2 is installed on top of the transmission surface wall plate 1 of the printing unit, and an observation mirror 3 is installed on the mirror base 2. The mirror surface of the observation mirror 3 is tilted downwards, and the lamp source 6 is located above the ink fountain 9. The illumination direction of the lamp source 6 forms an acute angle with the observation direction of the mirror surface of the observation mirror 3. The mirror base 2 has an inverted L-shaped cross-section, including a vertical part and a horizontal part. The vertical part is fixedly connected to the transmission surface wall plate 1 of the printing unit, and an angle adjustment mechanism is provided at the end of the horizontal part. The angle adjustment mechanism is rotatably connected to the observation mirror 3. Based on embodiment 5, in this embodiment, the angle adjustment mechanism includes a double-ear bracket, which is set on both sides of the end of the horizontal part of the inverted L-shape. Corresponding rotating holes are opened on the double-ear bracket, and rotating shafts are sleeved in the rotating holes. The axial extension direction of the rotating shafts is perpendicular to the length direction of the connecting body 5. Several pin holes are evenly spaced around the rotating hole on the double-ear bracket. Two protruding connecting seats are vertically positioned at the center of the back of the observation mirror 3. Corresponding through holes are formed on the two protruding connecting seats, through which the rotating shaft extends. A bushing is fixed to the outside of the through hole. Arc-shaped grooves are formed around the through holes on the two protruding connecting seats, with the center of the arc-shaped grooves coinciding with the center of the through hole. Pins are fitted inside the arc-shaped grooves, extending into the corresponding pin holes on the double-ear bracket for fixation. The pins, double-ear bracket, and protruding connecting seats are fitted with a clearance fit, allowing the observation mirror 3 to rotate flexibly. Adjusting the pitch angle of the observation mirror 3 ensures that the mirror surface receives maximum light from the lamp source 6. The observation mirror 3 rotates around the axis of the horizontal end of the inverted L-shape. The fastener plate focuses the light reflected from the ink fountain 9 by the lamp source 6 and the light reflected from the observation mirror 3 together. Adjusting the angle and distance between the observation mirror 3 and the lamp source 6 and ink fountain 9 maximizes the light focusing.

[0022] Example 7 This utility model relates to an ink volume observation device for a web offset printing machine, comprising a lamp assembly positioned above the printing unit. A reflector is positioned on one side of the printing unit, and the light emitted by the lamp assembly is reflected by the reflector, which focuses and reflects the ink volume of the printing unit. The printing unit includes a drive surface wall plate 1 and an operating surface wall plate 8. Two guide roller supports 4 are positioned opposite each other above the drive surface wall plate 1 and the operating surface wall plate 8, and the lamp assembly is positioned between the two guide roller supports 4. The lamp assembly is located above the ink fountain area, where an ink fountain 9 is located. A reflector is installed on the top of the drive surface wall plate 1. The lamp assembly includes a connecting body 5 positioned between the two guide roller supports 4. A lamp holder 7 is positioned in the middle of the lower surface of the connecting body 5, and a lamp source 6 is mounted on the lamp holder 7. The ink fountain 9 is located directly below the lamp holder 7. The reflective assembly includes a mirror base 2, a paper guide roller bracket 4 with a transmission surface wall plate 1 of the printing unit below it, and an operation surface wall plate 8 below the other paper guide roller bracket 4. The mirror base 2 is installed on top of the transmission surface wall plate 1 of the printing unit, and an observation mirror 3 is installed on the mirror base 2. The mirror surface of the observation mirror 3 is tilted downwards, and the lamp source 6 is located above the ink fountain 9. The illumination direction of the lamp source 6 forms an acute angle with the observation direction of the mirror surface of the observation mirror 3. The mirror base 2 has an inverted L-shaped cross-section, including a vertical part and a horizontal part. The vertical part is fixedly connected to the transmission surface wall plate 1 of the printing unit, and an angle adjustment mechanism is provided at the end of the horizontal part. The angle adjustment mechanism is rotatably connected to the observation mirror 3. The angle adjustment mechanism includes a double-ear bracket, which is located on both sides of the end of the horizontal part of the inverted L-shape. Corresponding rotating holes are opened on the double-ear bracket, and rotating shafts are sleeved in the rotating holes. The axial extension direction of the rotating shafts is perpendicular to the length direction of the connecting body 5. Several pin holes are evenly spaced around the rotating hole on the double-ear bracket. Two protruding connecting seats are vertically arranged at the center of the back of the observation mirror 3. Through holes are opened on the two protruding connecting seats, and the rotating shaft extends through the through holes. A bushing is fixed on the outside of the through holes. Arc-shaped grooves are opened around the through holes on the two protruding connecting seats. The center of the arc-shaped grooves coincides with the center of the through holes. Pins are fitted inside the arc-shaped grooves and extend into the corresponding pin holes on the double-ear bracket for fixation. Based on embodiment 6, the lamp holder 7 in this embodiment adopts an adjustable angle mounting bracket. The adjustable angle mounting bracket facilitates the adjustment of the angle of the lamp source 6, improves the flexibility of the rotation of the lamp source 6, and uses a locking screw to fix the lamp source 6 after it is adjusted to the specified angle position, thereby improving the illumination uniformity of the lamp source 6. The lamp source 6 adopts a PGB-350-12W DC24V LED equipment lighting lamp to meet different lighting needs and improve the stability during use.

[0023] Example 8 This utility model relates to an ink volume observation device for a web offset printing machine, comprising a lamp assembly positioned above the printing unit. A reflector is positioned on one side of the printing unit, and the light emitted by the lamp assembly is reflected by the reflector, which focuses and reflects the ink volume of the printing unit. The printing unit includes a drive surface wall plate 1 and an operating surface wall plate 8. Two guide roller supports 4 are positioned opposite each other above the drive surface wall plate 1 and the operating surface wall plate 8, and the lamp assembly is positioned between the two guide roller supports 4. The lamp assembly is located above the ink fountain area, where an ink fountain 9 is located. A reflector is installed on the top of the drive surface wall plate 1. The lamp assembly includes a connecting body 5 positioned between the two guide roller supports 4. A lamp holder 7 is positioned in the middle of the lower surface of the connecting body 5, and a lamp source 6 is mounted on the lamp holder 7. The ink fountain 9 is located directly below the lamp holder 7. The reflective assembly includes a mirror base 2, a paper guide roller bracket 4 with a transmission surface wall plate 1 of the printing unit below it, and an operation surface wall plate 8 below the other paper guide roller bracket 4. The mirror base 2 is installed on top of the transmission surface wall plate 1 of the printing unit, and an observation mirror 3 is installed on the mirror base 2. The mirror surface of the observation mirror 3 is tilted downwards, and the lamp source 6 is located above the ink fountain 9. The illumination direction of the lamp source 6 forms an acute angle with the observation direction of the mirror surface of the observation mirror 3. The mirror base 2 has an inverted L-shaped cross-section, including a vertical part and a horizontal part. The vertical part is fixedly connected to the transmission surface wall plate 1 of the printing unit, and an angle adjustment mechanism is provided at the end of the horizontal part. The angle adjustment mechanism is rotatably connected to the observation mirror 3. The angle adjustment mechanism includes a double-ear bracket, which is located on both sides of the end of the horizontal part of the inverted L-shape. Corresponding rotating holes are opened on the double-ear bracket, and rotating shafts are sleeved in the rotating holes. The axial extension direction of the rotating shafts is perpendicular to the length direction of the connecting body 5. Several pin holes are evenly distributed around the rotating hole on the double-ear bracket. Two protruding connecting seats are vertically arranged at the center of the back of the observation mirror 3. Through holes are opened on the two protruding connecting seats, and the rotating shaft extends through the through holes. A bushing is fixed on the outside of the through holes. Arc-shaped grooves are opened around the through holes on the two protruding connecting seats. The center of the arc-shaped grooves coincides with the center of the through holes. Pins are fitted inside the arc-shaped grooves and extend into the corresponding pin holes on the double-ear bracket for fixation. The lamp holder 7 adopts an adjustable angle mounting bracket, which facilitates the adjustment of the angle of the lamp source 6 and improves the flexibility of the rotation of the lamp source 6. The adjustable angle mounting bracket is equipped with a stop screw. After the lamp source 6 is adjusted to the specified angle position, it is fixed. The lamp source 6 is a PGB-350-12W DC24V LED equipment lighting lamp. Based on embodiment 7, in this embodiment, the connecting body 5 adopts a connecting beam or connecting shaft with internal threads at both ends. The connecting body 5 is made of steel.

[0024] The working principle of this utility model for an ink volume observation device for a web offset printing machine is as follows: The printing unit includes a transmission wall panel 1, a paper guide roller bracket 4, an operating wall panel 8, and an ink fountain 9. The lamp assembly includes a connecting body 5, which is fixed between two paper guide roller brackets 4. A lamp holder 7 is installed on the connecting body 5, and a lamp source 6 is installed on the lamp holder 7. The lamp source 6 itself adjusts the illumination direction, and the illumination angle of the light source is changed by adjusting the angle of the lamp source 6. The lamp source 6 is installed above the ink fountain 9 of the printing unit. The reflective assembly includes a mirror base 2, which is fixedly installed on the top of the transmission wall panel 1. The mirror base 2 is rotatably connected to an observation mirror 3. The observation mirror 3 is installed above the transmission wall panel 1. Because the observation mirror 3 is aligned with the ink fountain 9, the operator can directly observe the ink volume on the ground from the operating side of the printing unit, saving the labor intensity of climbing, eliminating safety hazards, and improving work efficiency.

[0025] The working process of the ink volume observation device for the web offset printing machine of this utility model is as follows: Figure 2 As shown, adjust the light source 6, rotate the observation mirror 3, and align the mirror of the observation mirror 3 with the ink fountain 9 below. The operator can clearly observe the ink volume of the ink fountain 9. During the printing operation, the ink volume is displayed in real time through the observation mirror 3. The operator can observe the ink volume directly from the operating side of the printing unit from the ground.

[0026] This utility model relates to an ink volume observation device for a web offset printing machine. It improves upon the existing printing unit's transmission surface wall panel 1, guide roller bracket 4, operating surface wall panel 8, and ink fountain 9. By installing a lamp assembly and a reflector assembly, the overall angle of the lamp source 6 and the observation mirror 3 can be flexibly adjusted to observe the ink volume of the ink fountain 9. This improves the flexibility of installation and adaptation. At the same time, the installation method is simple, requiring no large number of parts. It realizes ink volume observation, simplifies the operation process, and greatly shortens the assembly time, providing convenience for later maintenance and repair.

Claims

1. Ink amount observation device for a web offset press, characterized in that It includes a lamp assembly, which is positioned above the printing unit. A reflective component is positioned on one side of the printing unit. The light emitted by the lamp assembly is reflected by the reflective component, which achieves focused reflection of the ink volume in the printing unit.

2. Ink metering device for a web offset printing press according to claim 1, characterized in that The printing unit includes a transmission wall panel (1) and an operation wall panel (8). Two paper guide roller supports (4) are arranged opposite each other above the transmission wall panel (1) and the operation wall panel (8). A lamp assembly is arranged between the two paper guide roller supports (4) and located above the ink fountain area. An ink fountain (9) is arranged in the ink fountain area. A reflective assembly is installed on the top of the transmission wall panel (1).

3. The ink volume observation device for a web offset printing machine according to claim 2, characterized in that, The lamp body assembly includes a connector (5), which is disposed between two paper guide roller supports (4). A lamp holder (7) is disposed in the middle of the lower surface of the connector (5), and a lamp source (6) is installed on the lamp holder (7). The ink fountain (9) is located directly below the lamp holder (7).

4. The ink volume observation device for a web offset printing machine according to claim 3, characterized in that, The reflective assembly includes a mirror base (2), a paper guide roller bracket (4) with a transmission surface wall panel (1) of the printing unit below it, and an operation surface wall panel (8) with another paper guide roller bracket (4) below it. The mirror base (2) is installed on the top of the transmission surface wall panel (1) of the printing unit, and an observation mirror (3) is installed on the mirror base (2). The mirror surface of the observation mirror (3) is tilted downwards, and the light source (6) is located above the ink fountain (9). The illumination direction of the light source (6) is at an acute angle to the observation direction of the mirror surface of the observation mirror (3).

5. The ink volume observation device for a web offset printing machine according to claim 4, characterized in that, The mirror mount (2) has an inverted L-shaped cross section, which includes a vertical part and a horizontal part. The vertical part is fixedly connected to the transmission surface wall plate (1) of the printing unit, and the horizontal part is provided with an angle adjustment mechanism at the end. The angle adjustment mechanism is rotatably connected to the observation mirror (3).

6. The ink volume observation device for a web offset printing machine according to claim 5, characterized in that, The angle adjustment mechanism includes a double-ear bracket, which is set on both sides of the horizontal end of the inverted L-shaped part. A rotating hole is opened on the double-ear bracket, and a rotating shaft is sleeved in the rotating hole. The axial extension direction of the rotating shaft is perpendicular to the length direction of the connecting body (5). Several pin holes are evenly opened around the rotating hole on the double-ear bracket. Two protruding connecting seats are vertically set at the center of the back of the observation mirror (3). Two protruding connecting seats are opened with through holes. The rotating shaft extends through the through hole and is fixed by a bushing on the outside of the through hole. A circular arc groove is opened around the through hole on the two protruding connecting seats. The center of the circular arc groove coincides with the center of the through hole. A pin is sleeved in the circular arc groove and extends into the corresponding pin hole on the double-ear bracket for fixing.

7. The ink volume observation device for a web offset printing machine according to claim 6, characterized in that, The lamp holder (7) adopts an adjustable angle mounting bracket, and a stop screw is used on the adjustable angle mounting bracket.

8. The ink volume observation device for a web offset printing press according to claim 7, characterized in that, The connecting body (5) is a connecting beam or connecting shaft with internal threads at both ends, and the connecting body (5) is made of steel.

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