An automatic spot welding machine for the male end of a Type-C electrical connector

Abstract

The present invention relates to an automatic spot welding machine for the male end of a Type-C electrical connector, comprising a male end metal front shell material belt discharge mechanism, a male end metal rear shell feeding mechanism, a mating system, a first welding system, a flipping mechanism, a second welding system, and a male end metal shell material belt receiving mechanism. The male end metal front shell material belt discharge mechanism and the male end metal rear shell feeding mechanism respectively supply the male end metal front shell and the male end metal rear shell in pairs to the mating system. The mating system is used to complete the mating of the male end metal front shell and the male end metal rear shell. The first welding system is arranged downstream of the mating system to complete the welding of the front side of the male end of the electrical connector. Subsequently, the male end of the electrical connector is flipped 180° by a flipping mechanism. The second welding system is arranged downstream of the flipping mechanism to complete the welding of the back side of the male end of the electrical connector. The male end metal shell material belt receiving mechanism is arranged downstream of the second welding system to receive the formed Type-C electrical connector male end.

Description

Technical Field

[0001] The present invention relates to the technical field of electrical connector assembly, and in particular to an automatic spot welder for the male end of a Type-C electrical connector. Background Art

[0002] USB is the abbreviation of the English Universal Serial BUS, and its Chinese abbreviation is "universal serial cable". It is an external bus standard used to standardize the connection and communication between a computer and external devices, and is an interface technology applied in the PC field. USB was jointly proposed by multiple companies such as Intel, Compaq, IBM, and Microsoft at the end of 1994. USB not only has a fast transmission speed but is also very convenient to use. The USB interface also has the advantages of supporting plug-and-play and hot-plugging of devices, flexible connection, independent power supply, etc. It can be connected to a mouse, keyboard, printer, scanner, camera, flash drive, MP3 player, mobile phone, digital camera, external hard drive, external optical / floppy drive, USB network card, ADSL Modem, Cable Modem, etc. Almost all external devices are equipped with a USB interface and are very widely used.

[0003] The male end of the USB Type-C electrical connector is a connection interface of the USB interface. It can be inserted regardless of the front or back, and like other interfaces, it supports functions such as USB-standard charging, data transmission, and display output. USB Type-C is mainly aimed at thinner and more slender devices, enhancing usability and paving the way for performance enhancements in future USB versions.

[0004] The male end of the USB Type-C electrical connector is mainly composed of a male metal front shell and a male metal back shell that are mated and spot welded. In the past, the mating and spot welding of the male metal front shell and the male metal back shell were all done manually. First, workers complete the mating of the male metal front shell and the male metal back shell at the assembly station, and then transfer them to the welding station as a whole, using a laser spot welding machine to complete the welding and fixing of the male metal front shell and the male metal back shell, and finally flow into the packaging station. From the above description, it can be seen that the conventional workshop production line has the following problems: 1) The production line is composed of multiple stations connected in sequence, which is long and occupies a large production site; 2) Each station needs to be equipped with production workers, resulting in extremely high human resource costs; 3) When the male metal front shell and the male metal back shell are plugged in and transferred to the welding station, the male metal front shell is very likely to move relative to the male metal back shell due to the vibration force, which finally leads to the unqualified size of the male terminal of the electrical connector after welding; 4) The male metal front shell and the male metal back shell are The shell is small in size, which is not conducive to workers holding it, making manual assembly operations very difficult, resulting in extremely low assembly efficiency; furthermore, it requires workers to have high proficiency and sense of responsibility. Even so, there will inevitably be mismatches during the assembly process; 5) In the current molding process, a single-sided welding method is used to fix the male metal front shell and the male metal back shell (that is, a series of solder joints are formed on the front of the male end of the electrical connector). However, the connection strength between the male metal front shell and the male metal back shell is relatively weak. In the actual application process of the male end of the electrical connector, the male end of the electrical connector is very likely to crack due to the excitation force, thereby interrupting the normal execution of the signal transmission process. Therefore, it is urgent for technical personnel to solve the above problems. Summary of the invention

[0005] Therefore, in view of the above-mentioned existing problems and defects, the designers of the present invention collected relevant information, conducted multiple evaluations and considerations, and continued to experiment and modify after many years of R&D experience in this industry, which ultimately led to the emergence of the Type-C electrical connector male end automatic spot welding machine.

[0006] In order to solve the above technical problems, the present invention relates to an automatic spot welding machine for the male end of a Type-C electrical connector, wherein the male end of the Type-C electrical connector includes a material strip, a male metal front shell and a male metal rear shell. The male metal front shell is directly formed on the material strip, and is arranged at equal intervals along the length direction of the material strip. The number of male metal rear shells is consistent with the number of male metal front shells, and can be mated with the male metal front shell in a one-to-one correspondence. The automatic spot welding machine for the male end of the Type-C electrical connector includes a male metal front shell material strip unloading mechanism, a male metal rear shell loading mechanism, a mating system, a first welding system, a flipping mechanism, a second welding system and a male metal shell material strip receiving mechanism. Among them, the male metal front shell material strip unloading mechanism and the male metal rear shell loading mechanism are directly connected to the mating system to supply the male metal front shell and the male metal rear shell in pairs to the mating system respectively. The mating system includes a first material feeding line, a second material feeding line, a material handling unit and a material pushing unit. The first feed line is used to transport the male metal front shell, and a front circulation channel for the male metal front shell to flow is provided on it. A placement groove that is connected to the front circulation channel is also provided on the first feed line to place the male metal rear shell to be plugged in. The second feed line is arranged in parallel and directly behind the first feed line to transport the male metal rear shell, and a rear circulation channel is provided on it for the male metal rear shell to flow. The second feed line is also provided with a material collection avoidance gap that is connected to the rear circulation channel. The material handling unit spans the first feed line and the second feed line at the same time to transfer the male metal rear shell to the placement groove through the material collection avoidance gap; the material pushing unit is arranged directly behind the first feed line and opposite to the placement groove. When the male metal rear shell is placed in the placement groove and the male metal front shell is parked in place relative to the placement groove, the pushing unit is activated to push the male metal rear shell to perform translational movement toward the male metal front shell until the mating operation of the Type-C electrical connector male end is completed. The first welding system is arranged downstream of the mating system, and includes a third feed line and a first laser spot welder. The third feed line is used to convey the mated Type-C electrical connector male end. The first laser spot welder is arranged directly above the third feed line to complete the welding operation on the front of the Type-C electrical connector male end. The flipping mechanism is arranged downstream of the first welding system to flip the Type-C electrical connector male end 180° after a welding operation. The second welding system is arranged downstream of the flipping mechanism, and includes a fourth feed line and a second laser spot welder. The fourth feed line is used to convey the Type-C electrical connector male end that has completed single-sided welding. The second laser spot welder is arranged directly above the fourth feeding line to complete the welding operation on the back of the Type-C electrical connector male end. The male end metal shell material belt receiving mechanism is arranged downstream of the second welding system to receive the welded Type-C electrical connector male end.

[0007] As a further improvement of the technical solution of the present invention, the flipping mechanism includes a stopper rod unit. The stopper rod unit is arranged between the third feed line and the fourth feed line, and is composed of a plurality of stopper rods arranged in a linear array along the up-down direction and perpendicular to the feeding direction of the male end of the Type-C electrical connector. The male end of the Type-C electrical connector that has been frontally welded is sequentially coiled on the stopper rod; in the process of continuing to drag the fourth feed line, the male end of the Type-C electrical connector is gradually twisted 180° under the driving force of the reaction force of the stopper rod.

[0008] By adopting the above technical solution, at least the following beneficial technical effects are achieved:

[0009] 1) The Type-C electrical connector male end automatic spot welding machine integrates the male end metal front shell loading function, the male end metal back shell loading function, the mating function, the welding function, the flipping function and the material collection function into one, realizing the automatic loading, mating, welding and winding operations of the Type-C electrical connector male end, thereby greatly improving the manufacturing efficiency. Compared with the traditional assembly line forming method, it requires less workshop space and the labor demand is also effectively compressed;

[0010] 2) Before the mating operation is formally performed, the male metal front shell is conveyed via the first material conveying line and stops at a position corresponding to the placement groove; and the male metal rear shell is conveyed via the second material conveying line until it is translated to a position exactly aligned with the material taking and avoiding gap; when the male metal front shell is completely stopped in the front flow channel, the male metal rear shell is transferred to the placement groove via the material taking and avoiding gap by the material moving unit, thereby realizing the precise alignment operation of the male metal rear shell relative to the male metal front shell; then, the material pushing unit is activated to push the male metal rear shell to perform translational movement toward the male metal front shell until the mating operation of the male metal rear shell in the male metal front shell is completed, thereby effectively ensuring the mating quality of the male end of the electrical connector, and preventing the occurrence of wrong mating or inadequate mating or over-mating problems caused by improper mating force;

[0011] 3) In the current molding process, double-sided welding is used to fix the male metal front shell and the male metal back shell (that is, a series of welding points are formed on the front and back of the male end of the electrical connector), ensuring that there is a strong connection strength between the male metal front shell and the male metal back shell, and avoiding the phenomenon that the welding points of the electrical connector male end are easily cracked due to the excitation force in the subsequent actual application process. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0013] Figure 1 It is a structural schematic diagram of the male end of the Type-C electrical connector in the present invention (showing both the pre-mated state and the mated state).

[0014] Figure 2 It is a three-dimensional schematic diagram of the Type-C electrical connector male end automatic spot welding machine in the present invention from one perspective.

[0015] Figure 3 It is a three-dimensional schematic diagram of another viewing angle of the Type-C electrical connector male end automatic spot welding machine of the present invention.

[0016] Figure 4 It is a three-dimensional schematic diagram of a material discharge mechanism of a male metal front shell material belt in the Type-C electrical connector male automatic spot welding machine of the present invention.

[0017] Figure 5 It is a three-dimensional schematic diagram of the male end metal rear shell feeding mechanism in the Type-C electrical connector male end automatic spot welding machine of the present invention.

[0018] Figure 6 It is a three-dimensional schematic diagram of the plug-in system in the automatic spot welding machine for the male end of the Type-C electrical connector of the present invention.

[0019] Figure 7 It is a three-dimensional schematic diagram of the first material feeding line in the plug-in system of the present invention.

[0020] Figure 8 yes Figure 7 A partial enlarged view of I.

[0021] Fig. 9 It is a three-dimensional schematic diagram of the second material feeding line in the plug-in system of the present invention.

[0022] Fig.10 yes Fig. 9 A partial enlarged view of II.

[0023] Fig.11 It is a three-dimensional schematic diagram of a material handling unit in the mating system of the present invention.

[0024] Fig.12 It is a three-dimensional schematic diagram of the pusher unit in the mating system of the present invention.

[0025] Fig.13It is a three-dimensional schematic diagram of the first welding system in the automatic spot welding machine for the male end of the Type-C electrical connector of the present invention.

[0026] Fig.14 It is a three-dimensional schematic diagram of the flipping mechanism in the automatic spot welding machine for the male end of the Type-C electrical connector of the present invention.

[0027] Fig.15 It is a three-dimensional schematic diagram of the second welding system in the automatic spot welding machine for the male end of the Type-C electrical connector of the present invention.

[0028] Fig.16 It is a three-dimensional schematic diagram of a male end metal shell material belt receiving mechanism in the Type-C electrical connector male end automatic spot welding machine of the present invention.

[0029] 1-male end metal front shell material belt discharge mechanism; 2-male end metal rear shell material loading mechanism; 3-mating system; 31-first feed line; 311-front circulation channel; 312-placing groove; 32-second feed line; 321-rear circulation channel; 322-material collection avoidance gap; 33-material handling unit; 34-pushing unit; 4-first welding system; 41-third feed line; 42-first laser spot welding machine; 5-flipping mechanism; 51-blocking rod unit; 511-blocking rod; 6-second welding system; 61-fourth feed line; 62-second laser spot welding machine; 7-male end metal shell material belt receiving mechanism. DETAILED DESCRIPTION

[0030] In order to facilitate those skilled in the art to fully understand the technical solution disclosed in the present invention, before describing the Type-C electrical connector male end automatic spot welding machine in detail, a general description of the structure of the Type-C electrical connector male end is first made, as follows: Figure 1 As shown in the figure, the male end of the Type-C electrical connector includes a material strip, a male metal front shell and a male metal rear shell. The male metal front shell is directly formed on the material strip and is arranged at equal intervals along the length of the material strip. The number of male metal rear shells is consistent with the number of male metal front shells, and can be mated with the male metal front shell one by one.

[0031] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by the terms "up", "down", "left", "right", "front", "back", etc. are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0032] In order to facilitate those skilled in the art to fully understand the technical solutions disclosed in the present invention, the present invention is further described in detail below in conjunction with specific embodiments. Figure 2 , Figure 3 The three-dimensional schematic diagrams of the Type-C electrical connector male end automatic spot welding machine of the present invention from two different perspectives are respectively shown. It can be seen that it is mainly composed of a male end metal front shell material belt discharge mechanism 1, a male end metal rear shell feeding mechanism 2, a mating system 3, a first welding system 4, a flipping mechanism 5, a second welding system 6, and a male end metal shell material belt receiving mechanism 7. Among them, the mating system 3, the first welding system 4, the flipping mechanism 5, the second welding system 6, and the male end metal shell material belt receiving mechanism 7 are sequentially arranged downstream of the male end metal front shell material belt discharge mechanism 1, and the male end metal rear shell feeding mechanism 2 is arranged side by side with the male end metal front shell material belt discharge mechanism 1 to supply the male end metal rear shell. The male end metal front shell material belt discharge mechanism 1 and the male end metal rear shell feeding mechanism 2 are directly connected to the mating system 3 to supply the male end metal front shell and the male end metal rear shell in pairs.

[0033] like Figure 4-16As shown in , the mating system 3 preferably includes a first feed line 31, a second feed line 32, a material handling unit 33 and a material pushing unit 34. The first feed line 31 is used to transport the male metal front shell, and a front circulation channel 311 for the male metal front shell to flow is provided on it. A placement groove 312 that is connected to the above-mentioned front circulation channel 311 is also provided in the first feed line 31 to be used for placing the male metal rear shell to be mated. The second feed line 32 is arranged in parallel to the rear of the first feed line 31 to transport the male metal rear shell, and a rear circulation channel 321 for the male metal rear shell to flow is provided on it. A material collection avoidance gap 322 that is connected to the above-mentioned rear circulation channel 321 is also provided in the second feed line 32. The material handling unit 33 spans the first feed line 31 and the second feed line 32 at the same time to transfer the male metal rear shell to the placement groove 312 through the material collection avoidance gap 322. The pushing unit 34 is arranged directly behind the first feeding line 31 and is opposite to the placement groove 312. When the male metal rear shell is placed in the placement groove 312 and the male metal front shell is parked in place relative to the placement groove 312, the pushing unit 34 is actuated to push the male metal rear shell to perform translational movement toward the male metal front shell until the mating operation of the Type-C electrical connector male end is completed. The first welding system 4 is arranged downstream of the mating system 3, and includes a third feeding line 41 and a first laser spot welder 42. The third feeding line 41 is used to transport the male end of the Type-C electrical connector that has been mated. The first laser spot welder 42 is arranged directly above the third feeding line 41 to complete the welding operation on the front of the male end of the Type-C electrical connector. The flipping mechanism 5 is arranged downstream of the first welding system 4 to flip the male end of the Type-C electrical connector 180° after a welding operation. The second welding system 6 is arranged downstream of the flipping mechanism 5, and includes a fourth feed line 61 and a second laser spot welder 62. The fourth feed line 61 is used to convey the Type-C electrical connector male end that has completed single-sided welding. The second laser spot welder 62 is arranged directly above the fourth feed line 61 to complete the welding operation on the back of the Type-C electrical connector male end. The male end metal shell material belt receiving mechanism 7 is arranged downstream of the second welding system 6 to receive the welded Type-C electrical connector male end.

[0034] In addition, in order to further simplify the design structure and reduce the occupied area, the third feed line 41 and the second feed line 32 share the same conveying line (by Figure 2 can also be seen in ).

[0035] In the actual application process, the working process of the Type-C electrical connector male end automatic spot welding machine is as follows:

[0036] A. The male metal front shell material belt unloading mechanism 1 and the male metal rear shell feeding mechanism 2 respectively supply the male metal front shell and the male metal rear shell to the mating system 3; the male metal front shell and the male metal rear shell respectively flow continuously in the front flow channel 311 and the rear flow channel 321;

[0037] B. In the process of flowing along the front circulation channel 311, before the mating operation is performed, the male metal front shell is stopped corresponding to the placement groove 312; and the male metal rear shell is transported via the second material conveying line 32 until it is translated to the position exactly aligned with the material taking avoidance gap 322;

[0038] C. After the male metal front shell has been parked in the front flow channel 311, the material moving unit 33 transfers the male metal rear shell to the placement groove 312 through the material taking and avoiding gap 322, thus achieving the precise alignment operation of the male metal rear shell relative to the male metal front shell;

[0039] D. The pushing unit 34 is actuated to push the male metal rear shell to perform translational movement toward the male metal front shell until the male metal rear shell is mated with the male metal front shell;

[0040] E. The mated male end of the electrical connector is transported to the first welding system 4 to perform front welding;

[0041] F. The male end of the electrical connector after single-sided welding is turned 180° by the turning mechanism 5 so that its back side faces upward;

[0042] G. The male end of the electrical connector that has completed front welding is transported to the second welding system 6 to perform back welding;

[0043] H. The formed male end of the electrical connector is continuously conveyed downstream and is finally rolled up by the male end metal shell material belt receiving mechanism 7.

[0044] By adopting the above technical solution, at least the following beneficial technical effects are achieved:

[0045] 1) The Type-C electrical connector male end automatic spot welding machine integrates the male end metal front shell loading function, the male end metal back shell loading function, the mating function, the welding function, the flipping function and the material collection function into one, realizing the automatic loading, mating, welding and winding operations of the Type-C electrical connector male end, thereby greatly improving the manufacturing efficiency. Compared with the traditional assembly line forming method, it requires less workshop space and the labor demand is also effectively compressed;

[0046] 2) Before the mating operation is formally performed, the male metal front shell is conveyed via the first material conveying line 31 and stops corresponding to the placement groove 312; and the male metal rear shell is conveyed via the second material conveying line 32 until it is translated to be aligned with the material taking avoidance gap 322; when the male metal front shell is completely stopped in the front circulation channel 311, the male metal rear shell is transferred to the placement groove 312 via the material taking avoidance gap 322 by the material moving unit 33, thereby realizing the precise alignment operation of the male metal rear shell relative to the male metal front shell; then, the pushing unit 34 is actuated to push the male metal rear shell to perform translational movement toward the male metal front shell until the mating operation of the male metal rear shell in the male metal front shell is completed, thereby effectively ensuring the mating quality of the male end of the electrical connector, and preventing the occurrence of wrong mating or inadequate mating or over-mating problems caused by improper mating force;

[0047] 3) In the current molding process, double-sided welding is used to fix the male metal front shell and the male metal back shell (that is, a series of welding points are formed on the front and back of the male end of the electrical connector), ensuring that there is a strong connection strength between the male metal front shell and the male metal back shell, and avoiding the phenomenon that the welding points of the electrical connector male end are easily cracked due to the excitation force in the subsequent actual application process.

[0048] It is known that the flipping mechanism 5 can adopt a variety of design structures to realize the flipping operation of the male end of the electrical connector, but hereby recommends an implementation scheme with a simple design structure, which is convenient for implementation and later maintenance, as follows: Fig.14 As shown in , the flipping mechanism 5 is preferably a stopper rod unit 51. The stopper rod unit 51 is arranged between the third feed line 41 and the fourth feed line 61, and is composed of a plurality of stopper rods 511 arranged in a linear array along the up-down direction and perpendicular to the feeding direction of the male end of the Type-C electrical connector. The male end of the Type-C electrical connector that has been welded on the front side is coiled on the stopper rod 511 in sequence; in the process of continuing to drag the fourth feed line 61, the male end of the Type-C electrical connector is gradually twisted 180° under the driving force of the reaction force of the stopper rod 511. Before the flipping operation of the male end of the electrical connector is pre-executed, it is only necessary to coil it on the stopper rod 511 in sequence (in order to avoid obvious creases on the male end of the electrical connector, the helix angle should be controlled within 30°), and then, in the process of the fourth feed line 61 dragging the male end of the electrical connector, automatic flipping is realized, and the flipping mechanism does not need to be driven by power throughout the whole process.

[0049] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An automatic spot welding machine for the male end of a Type-C electrical connector, wherein the male end of the Type-C electrical connector comprises a material strip, a male end metal front shell and a male end metal rear shell; the male end metal front shell is directly formed on the material strip and is arranged at equal intervals along the length direction of the material strip; the number of the male end metal rear shells is consistent with the number of the male end metal front shells, and can be mated with the male end metal front shell in a one-to-one correspondence, characterized in that: It includes a male metal front shell material strip discharge mechanism, a male metal rear shell material strip feeding mechanism, a mating system, a first welding system, a flipping mechanism, a second welding system and a male metal shell material strip receiving mechanism; wherein the male metal front shell material strip discharge mechanism and the male metal rear shell material strip feeding mechanism are directly connected to the mating system to respectively supply the male metal front shell and the male metal rear shell in pairs to the mating system; the mating system includes a first material feeding line, a second material feeding line, a material moving unit and a material pushing unit; the first material feeding line is used to transport the male metal front shell, and a front circulation channel for the male metal front shell to flow is opened on it; the first material feeding line is also provided with a placement groove that intersects with the front circulation channel, to place the male metal back shell to be mated; the second material feeding line is arranged in parallel to the rear of the first material feeding line to transport the male metal back shell, and a rear circulation channel for the male metal back shell to flow through is opened on it; the second material feeding line is also provided with a material taking avoidance gap that is connected to the rear circulation channel; in the process of flowing along the front circulation channel, before the mating operation is required, the male metal front shell is stopped corresponding to the placement groove; and the male metal back shell is transported via the second material feeding line until it is translated to a position aligned with the material taking avoidance gap; the material handling unit simultaneously spans the first material feeding line and the second material feeding line to move the male metal back shell through the material taking avoidance gap The pusher unit is arranged directly behind the first feeding line and is opposite to the feeding groove; when the male metal rear shell is placed in the feeding groove and the male metal front shell is parked in place relative to the feeding groove, the pusher unit is actuated to push the male metal rear shell to translate toward the male metal front shell until the mating operation of the Type-C electrical connector male end is completed; the first welding system is arranged downstream of the mating system, and includes a third feeding line and a first laser spot welder; the third feeding line is used to transport the mated Type-C electrical connector male end; the first laser spot welder is arranged directly above the third feeding line to complete the mating of the Type-C electrical connector male end. The welding operation on the front side of the Type-C electrical connector male end; the flipping mechanism is arranged downstream of the first welding system to flip the Type-C electrical connector male end 180° after one welding operation; the second welding system is arranged downstream of the flipping mechanism, and it includes a fourth feed line and a second laser spot welder; the fourth feed line is used to transport the Type-C electrical connector male end that has completed single-sided welding; the second laser spot welder is arranged directly above the fourth feed line to complete the welding operation on the back side of the Type-C electrical connector male end; the male end metal shell material belt receiving mechanism is arranged downstream of the second welding system to receive the welded Type-C electrical connector male end.

2. The Type-C electrical connector male end automatic spot welding machine according to claim 1, characterized in that: The flipping mechanism includes a stop rod unit; the stop rod unit is arranged between the third feed line and the fourth feed line, and is composed of a plurality of stop rods arranged in a linear array along the up and down directions and perpendicular to the feeding direction of the male end of the Type-C electrical connector; the male end of the Type-C electrical connector that has been front-welded is sequentially coiled on the stop rod; in the continued dragging process of the fourth feed line, the male end of the Type-C electrical connector is gradually twisted 180° under the driving force of the reaction force of the stop rod unit.

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