Middle knuckle arm and single-cylinder bolt type telescopic arm

Abstract

The utility model discloses a telescopic arm middle section arm and a single cylinder bolt type telescopic arm, the middle section arm comprises an arm pin and a pin hole, one side or two sides of the arm pin are provided with a detection switch used for controlling a pin plugging and unplugging mechanism to release the arm pin, and the same side of the pin hole and the arm pin is correspondingly provided with a detection block used for switching the detection switch to release signals. According to the utility model, the plurality of middle knuckle arms are sequentially sleeved, when the single-cylinder bolt type telescopic arm is manufactured, the detection switch of the inner knuckle arm corresponds to the detection block of the adjacent outer knuckle arm, and when the positions of the arm pin and the pin hole of the inner knuckle arm and the outer knuckle arm correspond, the detection switch acquires a signal of the detection block and immediately sends an arm pin releasing signal to the pin plugging and unplugging mechanism controller, so that the single-cylinder bolt type telescopic arm is manufactured. The arm pin of the inner knuckle arm pops up and is inserted into the corresponding pin hole of the outer knuckle arm, the inner knuckle arm and the outer knuckle arm are locked, the arm pin does not make contact with the outer knuckle arm before being released, and noise and friction loss caused by sliding of the arm pin of the inner knuckle arm relative to the outer knuckle arm are reduced.

Description

Technical Field

[0001] The utility model relates to an intermediate section arm for a telescopic arm and also relates to a single-cylinder latch-type telescopic arm, belonging to the field of lifting devices. Background Art

[0002] The telescopic boom is composed of multiple inner and outer jointed sections, among which the innermost section is called the end section, the outermost section is the basic arm, and the sections between the end section and the basic arm are intermediate sections (first section, second section, etc.). The extension or retraction of the section is achieved by the telescopic oil cylinder set inside the end section, and any two adjacent sections are locked by an arm pin. For example, the invention patent with publication number CN111039199 A discloses a single-cylinder pin-type telescopic boom and crane, and the invention patent with publication number CN 103204435A discloses a single-cylinder pin-type telescopic boom telescopic oil cylinder positioning method. The specific process of extending the telescopic arm is as follows: the piston rod of the telescopic cylinder is connected to the basic arm, and a cylinder pin telescopic mechanism and a pin insertion and extraction mechanism for controlling the arm pin are arranged outside the cylinder body. When the last arm is extended, the cylinder pin of the cylinder docks with the cylinder pin hole at the end of the last arm, and the pin insertion and extraction mechanism retracts the arm pin of the last arm. The cylinder drives the last arm to slide and extend, and the extension length of the telescopic cylinder piston rod is converted into the extension distance of the arm section to be extended, and compared with the theoretical pin hole position, when the extension distance of the last arm is close to the pin hole position, the pin insertion and extraction mechanism releases the arm pin in advance, and the upper surface of the arm pin contacts and slides relatively with the inner wall of the second arm section. As the cylinder continues to extend forward, when it reaches the pin hole, the arm pin pops out and the two arms are locked. The pin insertion and extraction mechanism needs to release the arm pin in advance, otherwise the arm pin cannot be extended in time, but if the arm pin is released in advance, the friction between the top of the arm pin and the inner wall of the second arm section will produce noise, increase the wear of the arm pin, and have a poor user experience. Utility Model Content

[0003] Purpose of the utility model: The purpose of the utility model is to provide an intermediate arm section for a telescopic arm which helps to reduce wear and noise. Another purpose of the utility model is to provide a single-cylinder latch-type telescopic arm.

[0004] Technical solution: The utility model discloses an intermediate arm section for a telescopic arm, comprising an arm pin and a pin hole. A detection switch for controlling a pin plugging and pulling mechanism to release the arm pin is provided on one side or both sides of the arm pin. A detection block for switching the detection switch to release the signal is provided on the same side of the pin hole and the arm pin.

[0005] When multiple intermediate arms of the utility model are sequentially sleeved to make a single-cylinder latch-type telescopic arm, the detection switch of the inner arm corresponds to the detection block of the outer arm. When the arm pin and the pin hole positions of the inner arm and the outer arm correspond, the detection switch detects the detection block signal and immediately sends an arm pin release signal to the pin insertion and extraction mechanism. The arm pin of the inner arm pops out and is inserted into the corresponding pin hole of the outer arm to complete the locking, thereby avoiding noise and friction loss caused by premature extension of the arm pin.

[0006] Preferably, in order to ensure that the plug-in and pull-out pin mechanism of the oil cylinder simultaneously controls multiple arm pins to accurately extend, the detection switch is connected to a contact signal interface 1 for connecting to the plug-in and pull-out pin mechanism. The plug-in and pull-out pin mechanism slides to the corresponding telescopic end of the joint arm, the cylinder pin is connected to the joint arm, and the plug-in and pull-out pin mechanism is simultaneously connected to the corresponding detection switch.

[0007] Preferably, in order to facilitate the detection switch to obtain a sudden change signal and increase the detection sensitivity, a transition bar that sends an opposite signal to the detection block is provided on the side of the detection block away from the pin hole.

[0008] Preferably, the detection switch and the detection block are arranged on the side of the arm pin and the pin hole close to the cylinder piston rod, and the distance between the detection switch and the axis of the arm pin is smaller than the distance between the detection block and the center of the pin hole. Considering the possible delay of the signal, the detection switch can detect the detection block signal in advance to ensure that adjacent arm sections are accurately locked to each other and reduce noise.

[0009] Preferably, in order to avoid the influence of signal delay, the detection switch and the detection block are arranged on the side of the arm pin and the pin hole away from the cylinder piston rod, and the distance from the detection switch to the arm pin axis is greater than the distance from the detection block to the center of the pin hole.

[0010] Preferably, in order to prevent the internal environment of the telescopic arm from affecting the detection block and the detection switch, the detection switch and the detection block are both arranged on opposite sides of the arm pin and the pin hole, and the midpoint of the distance between the detection switches on both sides of the arm pin is offset toward the cylinder piston rod side, and the offset distance relative to the arm pin axis is 1 to 3 mm, and the midpoint of the distance between the detection blocks on both sides of the pin hole coincides with the center of the pin hole.

[0011] A single-cylinder latch-type telescopic arm is made from the aforementioned intermediate section arm.

[0012] Preferably, it also includes a basic arm and an end arm, the intermediate arm is arranged between the basic arm and the end arm, and a detection switch for controlling the plug-in pin mechanism to release the arm pin is provided on one side or both sides of the arm pin of the end arm, and a detection block for switching the detection switch to send a signal is provided on the same side as the basic arm pin hole and the arm pin.

[0013] Preferably, it also includes a plug-in pin mechanism provided on the oil cylinder, wherein the plug-in pin mechanism and the arm pin are provided with a contact signal interface 2 for connecting to the detection switch on the same side. When the contact signal interface 1 and the contact signal interface 2 are connected, the detection switch and the plug-in pin mechanism are connected.

[0014] Beneficial effects: Compared with the prior art, the utility model has the following advantages: 1. The arm pin does not contact the outer arm before release, which reduces the friction between the arm pin and the inner wall of the arm and reduces noise; 2. Accurate signal detection; 3. Easy installation; 4. The arm pin release error of multiple arms is reduced at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the arm pin release structure of a single-cylinder latch-type telescopic arm in the prior art.

[0016] Figure 2 It is a schematic diagram of the arm pin retracted state of the single-cylinder latch-type telescopic arm of the utility model.

[0017] Figure 3 It is a schematic diagram of the arm pin release state of the single-cylinder latch-type telescopic arm of the utility model.

[0018] Figure 4 The utility model is a schematic diagram of the internal structure of a multi-section arm of a single-cylinder latch-type telescopic arm.

[0019] Figure 5 It is a schematic diagram of the arm pin of the joint arm of the single-cylinder latch-type telescopic arm of the utility model in the retracted moving state.

[0020] Figure 6 It is a schematic diagram of the arm pin locking state of the joint arm of the single-cylinder latch-type telescopic arm of the utility model.

[0021] Figure 7 The utility model is a schematic diagram of the single-section arm structure of the single-cylinder latch type telescopic arm.

[0022] Figure 8 for Figure 7 Schematic diagram of the structure in direction A. DETAILED DESCRIPTION

[0023] The technical solution of the utility model is further described below in conjunction with the accompanying drawings.

[0024] Embodiment 1: The single-cylinder pin-type telescopic arm is mainly composed of a terminal arm, a basic arm, and a plurality of intermediate arms sequentially sleeved between the terminal arm and the basic arm. Each arm is cylindrical. For the convenience of description, starting from the terminal arm, the intermediate arms are sequentially named as the first arm 1, the second arm 2, etc. from the inside to the outside. Figures 1 to 8 Only the first boom 1 and the second boom 2 are shown.

[0025] An oil cylinder 3 is provided inside the first section arm 1, and a piston rod 31 of the oil cylinder 3 is connected to the end of the basic arm (not shown). An arm pin 11 is provided at one end (retracted end) of the first section arm 1 close to the piston rod 31, and a spring is provided on the outer sleeve of the arm pin 11, and the spring is used to make the arm pin pop out and reset, and the arm pin is used to lock the first section arm 1 and the second section arm 2 sleeved outside the first section arm. A plug-in and pull-out pin mechanism 32 is provided on the outer wall of the oil cylinder 3, and when the plug-in and pull-out pin mechanism 32 is connected to the arm pin 11, it can drive the arm pin 11 to retract toward the piston rod 31, and release the lock between the first section arm and the second section arm.

[0026] like Figure 2As shown, a detection switch 13 for controlling the plug-in pin mechanism 32 to release the arm pin 11 is provided on the right side of the arm pin 11 of the first arm section 1, that is, the side of the arm pin 11 close to the piston rod 31. Correspondingly, a detection block 14 (not shown) for switching the signal of the detection switch 13 is provided on the right side of the pin hole 12 of the first arm section 1. A contact signal interface 15 connected to the detection switch 13 is also provided at the retracted end of the first arm section 1. The detection switch 13 is connected to the plug-in pin mechanism 32 via the contact signal interface 15 to send an arm pin release signal to the plug-in pin mechanism 32.

[0027] Similarly, a detection switch 13, a detection block 14, and a contact signal interface 15 are provided at a position of the second arm 2 corresponding to the first arm 1.

[0028] like Figures 2 to 6 As shown, the first arm 1 and the second arm 2 are socketed, and the process of the first arm 1 being extended by the cylinder 3 is as follows: the cylinder pin is docked with the telescopic end of the first arm 1, and at the same time, the plug-in pin mechanism 32 is connected with the arm pin 11 to drive the arm pin 11 to retract, and the contact signal interface 15 is connected with the plug-in pin mechanism 32, and then the cylinder 3 drives the first arm 1 to slide unimpeded inside the second arm 2 to the vicinity of the next pin hole set on the second arm 2. When the arm pin 11 and the pin hole 22 are about to be aligned, the detection switch 13 also detects the detection block 14 set near the pin hole of the second arm 2. The detection switch 13 sends a command to release the arm pin 11 to the controller of the plug-in pin mechanism 32, and the arm pin pops out and is accurately inserted into the pin hole to complete the locking of the first arm and the second arm.

[0029] like Figures 7 and 8 As shown, detection blocks 14 are respectively arranged on the right side of the two pin holes 22 of the second arm 2. In this embodiment, the detection block 14 is made of a material that can be detected by the detection switch 13, and a transition strip 16 with a material that cannot be detected by the detection switch or a shielding effect is arranged between two adjacent detection blocks 14; or on the contrary, the detection block 14 is made of a material that cannot be detected by the detection switch 13, and a transition strip 16 that can be detected by the detection switch is arranged between two adjacent detection blocks 14. The detection switch obtains or loses the detection block signal to control the plug-in pin mechanism 32 to release the arm pin 11, so that the arm pin 11 extends out. Similarly, the positions of the detection switch 13 and the detection block 14 can be interchanged, and only the signal transmission path is changed, which does not affect the final effect.

[0030] In order to avoid the interference of signal delay, the detection switch 13 and the detection block 14 are arranged on the side of the arm pin 11 and the pin hole 22 close to the cylinder piston rod, and the distance between the detection switch 13 and the axis of the arm pin 11 is less than the distance between the detection block 14 and the center of the pin hole 22. Alternatively, the detection switch 13 and the detection block 14 are arranged on the side of the arm pin 11 and the pin hole 22 away from the cylinder piston rod, and the distance between the detection switch 13 and the axis of the arm pin 11 is less than the distance between the detection block 14 and the center of the pin hole 22, so as to use the position difference to buy time for signal transmission and make up for the time difference.

[0031] Embodiment 2: The difference between this embodiment and embodiment 1 is that detection switches 13 are provided on both sides of the arm pin 11 of the first section arm 1, and detection blocks 14 are provided on both sides of the pin hole 22 of the second section arm 2. The midpoint of the distance between the detection switches 13 on both sides of the same arm pin 11 is offset toward the cylinder piston rod, and the offset distance relative to the arm pin axis is 1 to 3 mm. This scheme is used to avoid detection errors caused by the deterioration of the internal environment of the telescopic arm and to compensate for the signal delay time.

[0032] Embodiment 3: The difference between this embodiment and embodiment 1 is that it further includes a terminal arm and a basic arm, and a contact signal interface 15 connected to the detection switch 13 is provided on one side of the arm pin of the terminal arm, a detection block 14 is provided on the same side of the pin hole and the arm pin of the basic arm (not shown), and a contact signal interface 2 33 for connecting to the contact signal interface 15 is provided on the right side of the plug-in pin mechanism 32.

Claims

1. An intermediate arm section for a telescopic arm, comprising an arm pin (11) and a pin hole (12), characterized in that: A detection switch (13) for controlling the pin plugging and pulling mechanism (32) to release the arm pin is provided on one or both sides of the arm pin, and a detection block (14) for switching the detection switch release signal is provided on the same side of the pin hole (12) and the arm pin (11).

2. The intermediate boom section for a telescopic boom according to claim 1, characterized in that: The detection switch (13) is connected to a contact signal interface (15) for connecting to a plug-in pin mechanism.

3. The intermediate boom for a telescopic boom according to claim 1, characterized in that: A transition strip (16) that emits a signal opposite to that of the detection block (14) is provided on one side of the detection block (14) away from the pin hole (12).

4. The intermediate boom section for a telescopic boom according to claim 1, characterized in that: The detection switch (13) and the detection block (14) are arranged on a side of the arm pin (11) and the pin hole (12) close to the cylinder piston rod, and the distance from the detection switch (13) to the axis of the arm pin (11) is smaller than the distance from the detection block (14) to the center of the pin hole (12).

5. The intermediate boom section for a telescopic boom according to claim 1, characterized in that: The detection switch (13) and the detection block (14) are arranged on a side of the arm pin (11) and the pin hole (12) away from the cylinder piston rod, and the distance from the detection switch (13) to the axis of the arm pin (11) is greater than the distance from the detection block (14) to the center of the pin hole (12).

6. The intermediate boom section for a telescopic boom according to claim 1, characterized in that: The detection switch (13) and the detection block (14) are both arranged on opposite sides of the arm pin (11) and the pin hole (12); the midpoint of the distance between the detection switches (13) on both sides of the arm pin (11) is offset toward the cylinder piston rod side, and the offset distance relative to the axis of the arm pin is 1 to 3 mm; the midpoint of the distance between the detection blocks (14) on both sides of the pin hole (12) coincides with the center of the pin hole.

7. A single-cylinder latch-type telescopic arm, characterized in that: Made from the intermediate arm described in any one of claims 1 to 6.

8. The single-cylinder latch-type telescopic arm according to claim 7, characterized in that: It also comprises a basic arm and a terminal arm, wherein a plurality of intermediate arms are sleeved between the basic arm and the terminal arm, a detection switch (13) for controlling a pin insertion and extraction mechanism (32) to release the arm pin is provided on one side or both sides of the arm pin of the terminal arm, and a detection block (14) for switching a signal released by the detection switch is provided on the same side as the basic arm pin hole and the arm pin (11).

9. The single-cylinder latch-type telescopic arm according to claim 8, characterized in that: It also includes an oil cylinder and a plug-in pin mechanism (32) arranged on the outer wall of the oil cylinder. The plug-in pin mechanism and the arm pin (11) are provided with a second contact signal interface (33) for connecting the detection switch (13) and the plug-in pin mechanism on the same side thereof.

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