Arm position detection device, single-cylinder bolt telescopic mechanism and telescopic arm assembly

Abstract

The utility model relates to the field of telescopic arms, and discloses an arm position detection device, a single-cylinder bolt telescopic mechanism and a telescopic arm assembly. The guide shaft is fixedly connected with the support; the movable detection assembly comprises a movable sleeve, a movable pressing block and a position sensor, the position sensor is fixed on the movable pressing block and is used for sensing an arm section sensing structure on the telescopic arm section, the movable sleeve is fixedly sleeved in the movable pressing block, and the movable sleeve is movably sleeved outside the guide shaft along the axial direction and is in rolling contact with the guide shaft; the elastic piece is arranged in the axial direction of the guide shaft, and the two axial ends of the elastic piece are connected with the support and the movable detection assembly respectively. According to the arm position detection device, due to the fact that the movable sleeve is in rolling contact with the guide shaft, friction resistance is small, the movement smoothness of the movable detection assembly when the movable detection assembly is pressed and reset can be improved, the clamping stagnation risk is effectively reduced, and therefore the reliability of the arm position detection device is effectively improved.

Description

Technical Field

[0001] The present application belongs to the technical field of telescopic arms, and specifically relates to an arm position detection device, a single-cylinder latch telescopic mechanism, and a telescopic arm assembly. Background Art

[0002] In machinery with telescopic arms, such as truck cranes, a single-cylinder latch telescopic mechanism can be installed inside the telescopic arm to drive the telescopic arm to perform telescopic movements. The telescopic cylinder in the single-cylinder latch telescopic mechanism can synchronously drive the latch mechanism to move during telescoping.

[0003] When the arm position detection device on the latch mechanism collides with the arm section sensing structure at the tail of a telescopic boom section and is compressed and moved, the latch mechanism releases the cylinder pin that passes through the cylinder pin hole at the tail of the telescopic boom section, so that the telescopic cylinder is fixed to the telescopic boom section through the latch mechanism. The latch mechanism then removes the arm pin that is used to limit the extension and retraction of the telescopic boom section. At this time, the extension and retraction of the telescopic cylinder can drive the synchronous extension and retraction of the telescopic boom section. When the arm position detection device loses contact with the arm section sensing structure, the arm position detection device can automatically reset to ensure that when it is squeezed by the arm section sensing structure at the tail of another telescopic boom section again, the latch mechanism can perform similar pin insertion and removal actions as described above.

[0004] However, the smoothness of the movement of the current arm position detection device cannot be guaranteed, and it is easy to cause failures such as failure to automatically reset after the pressure is eliminated due to jamming. In this way, the accuracy of the sensing signal of the arm position detection device cannot be guaranteed, which will cause the cylinder pin or arm pin to get stuck when the telescopic arm is extended or retracted, the telescopic arm to not be able to extend or retract automatically, and other failures, seriously affecting the normal use of the telescopic arm. Utility Model Content

[0005] The purpose of this application is to provide an arm position detection device, a single-cylinder latch telescopic mechanism and a telescopic arm assembly, which can effectively reduce the risk of the arm position detection device getting stuck.

[0006] In order to achieve the above objectives, the present application provides, on one hand, an arm position detection device, which includes:

[0007] Support;

[0008] A guide shaft, connected and fixed to the support;

[0009] a movable detection assembly, comprising a movable sleeve, a movable pressure block, and a position sensor, wherein the position sensor is fixed to the movable pressure block and is used to sense the arm section sensing structure on the telescopic arm section; the movable sleeve is sleeved and fixed in the movable pressure block; the movable sleeve is sleeved and movably sleeved on the outside of the guide shaft in the axial direction and forms rolling contact with the guide shaft; and

[0010] The elastic member is arranged along the axial direction of the guide shaft, and the axial ends of the elastic member are respectively connected to the support and the activity detection component.

[0011] In some embodiments, the movable sleeve is a linear bearing.

[0012] In some embodiments, the support is provided with a support through hole, the guide shaft passes through the support through hole and forms a clearance fit with the support through hole, and the arm position detection device further includes a connecting and fixing component for connecting and fixing the guide shaft and the support.

[0013] In some embodiments, one end of the guide shaft that passes through the support through hole is provided with a guide shaft connecting hole, and the support is further provided with a plurality of support connecting holes that are sequentially spaced and arranged around the support through hole, and the connecting and fixing assembly includes a mounting plate, a middle connecting piece, and a plurality of side connecting pieces, and the mounting plate is provided with a middle plate connecting hole aligned with the guide shaft connecting hole and a plurality of plate side connecting holes that are respectively aligned with the plurality of support connecting holes;

[0014] Among them, the plate surface of the mounting plate abuts against the surface of the support, the middle connecting piece connects and fixes the middle connecting hole of the plate and the guide shaft connecting hole, and the edge connecting holes of the plate and the support connecting holes that are aligned with each other are connected and fixed by the edge connecting piece.

[0015] In some embodiments, the middle connecting piece is a middle bolt, the screw portion of the middle bolt forms a threaded fit with the guide shaft connecting hole, and the head of the middle bolt is pressed against the mounting plate; the side connecting piece is a side bolt, the screw portion of the side bolt forms a threaded fit with the corresponding support connecting hole, and the head of the side bolt is pressed against the mounting plate.

[0016] In some embodiments, the movable pressing block is provided with a pressing block limiting structure at one axial end facing the support, for limiting the movable sleeve from falling out;

[0017] And / or, one axial end of the guide shaft passing through the movable pressing block is provided with a guide shaft limiting structure for limiting the movable sleeve from falling out.

[0018] In some embodiments, two axial ends of the elastic member are respectively connected to the support and the movable sleeve.

[0019] In some embodiments, there are multiple guide shafts, multiple movable sleeves and multiple elastic members, and the multiple guide shafts are arranged parallel to each other and spaced apart and are respectively sleeved with multiple movable sleeves. The multiple movable sleeves are all sleeved and fixed in the movable pressure block, and the multiple elastic members are respectively arranged corresponding to the multiple guide shafts.

[0020] The second aspect of the present application further provides a single-cylinder latch retracting mechanism, which includes the above-mentioned arm position detection device.

[0021] The third aspect of the present application further provides a telescopic arm assembly, which includes the above-mentioned single-cylinder latch telescopic mechanism.

[0022] Through the above technical solution, when the arm position detection device of the present application collides with the arm section sensing structure on a certain telescopic arm section, the position sensor fixed on the movable pressure block can sense the arm section sensing structure, so that the position sensor can generate a sensing signal corresponding to the telescopic arm section. By using an additional controller to analyze the sensing signal, it is possible to determine which telescopic arm section the arm position detection device is in, that is, to determine the current arm position. When the arm position detection device collides with the arm section sensing structure, the movable pressure block is subjected to pressure from the arm section sensing structure, and the movable pressure block can drive the movable sleeve to move along the guide shaft, while the movable detection component compresses the elastic part; when the pressure is eliminated, under the action of the rebound force of the elastic part, the movable pressure block can drive the movable sleeve to reset. Since the movable sleeve is in rolling contact with the guide shaft, the friction resistance is small, which can improve the smoothness of the movable detection component when it is pressed and reset, effectively reduce the risk of jamming, and thus effectively improve the reliability of the arm position detection device.

[0023] Other features and advantages of the embodiments of the present application will be described in detail in the subsequent detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The accompanying drawings are used to provide a further understanding of the embodiments of the present application and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the embodiments of the present application, but do not constitute a limitation on the embodiments of the present application. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without inventive work. In the drawings:

[0025] Figure 1 This is a partially cutaway perspective view of an arm position detection device in a specific embodiment of the present application;

[0026] Figure 2 for Figure 1 A partial sectional side view of the arm position detection device in FIG.

[0027] Description of Reference Numerals

[0028] 1 Support 2 Guide shaft

[0029] 3 elastic parts 4 movable sleeves

[0030] 5 Movable pressure block 6 Position sensor

[0031] 7 Middle connecting piece 8 Side connecting piece

[0032] 9 Mounting plate

[0033] 21 Guide shaft limiting structure 51 Pressure block limiting structure DETAILED DESCRIPTION

[0034] The following describes the specific embodiments of the present application in detail with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only used to illustrate and explain the present application and are not intended to limit the present application.

[0035] Reference Figure 1 and Figure 2 , a first exemplary embodiment of the present application provides an arm position detection device, which includes:

[0036] Support 1;

[0037] The guide shaft 2 is connected and fixed to the support 1;

[0038] a movable detection assembly, comprising a movable sleeve 4, a movable pressure block 5, and a position sensor 6, wherein the position sensor 6 is fixed to the movable pressure block 5 and is used to sense the arm-section sensing structure on the telescopic arm section; the movable sleeve 4 is sleeved and fixed in the movable pressure block 5, and the movable sleeve 4 is sleeved and movably sleeved on the outside of the guide shaft 2 in the axial direction and forms rolling contact with the guide shaft 2; and

[0039] The elastic member 3 is arranged along the axial direction of the guide shaft 2 , and the axial ends of the elastic member 3 are respectively connected to the support 1 and the activity detection component.

[0040] Through the above-mentioned arrangement, when the arm position detection device of the present application collides with the arm section sensing structure on a certain telescopic arm section, the position sensor 6 (for example, a proximity switch can be used) fixed on the movable pressure block 5 can sense the arm section sensing structure, so that the position sensor 6 can generate a sensing signal corresponding to the telescopic arm section. By using an additional controller (for example, a controller in a truck crane) to analyze the sensing signal, it is possible to determine in which telescopic arm section the arm position detection device is located, that is, to determine the current arm position.

[0041] When the arm position detection device collides with the arm joint sensing structure, the movable pressure block 5 is subjected to pressure from the arm joint sensing structure, driving the movable sleeve 4 along the guide shaft 2 while the movable detection assembly compresses the elastic member 3. When the pressure is removed, the elastic member 3's rebound force causes the movable pressure block 5 to reset the movable sleeve 4. Because the movable sleeve 4 is in rolling contact with the guide shaft 2, frictional resistance is minimal, improving the smoothness of the movable detection assembly's movement during compression and reset, effectively reducing the risk of jamming and thereby enhancing the reliability of the arm position detection device.

[0042] In addition, the movable sleeve 4 can also block oil, dust and the like from entering the gap between the movable pressing block 5 and the guide shaft 2 to a certain extent, which is beneficial to reducing the risk of the movable detection component being stuck due to foreign matter.

[0043] In some embodiments, the movable sleeve 4 can be a linear bearing. Specifically, the linear bearing, through its multiple balls, is in rolling contact with the guide shaft 2, and the linear bearing is tightly fitted into the movable pressure block 5. When the movable pressure block 5 is pressed or reset, the friction between the linear bearing and the movable pressure block 5 is greater than the friction between the multiple balls and the guide shaft 2. Therefore, the linear bearing and the movable pressure block 5 are relatively fixed, and the linear bearing moves along the guide shaft 2, eliminating the need for other means to secure the linear bearing and the movable pressure block 5.

[0044] In some embodiments, the support 1 is provided with a support through hole, and the guide shaft 2 passes through the support through hole and forms a clearance fit with the support through hole. At this time, the guide shaft 2 and the support 1 are connected and fixed by a connecting and fixing component.

[0045] With the arrangement of this embodiment, since the guide shaft 2 forms a clearance fit with the support through-hole, the guide shaft 2 is not easily deflected by external forces, effectively ensuring that the guide shaft 2 and the movable pressure block 5 do not form direct contact, avoiding increased friction that may cause the movable pressure block 5 to become stuck. This effectively ensures the positional accuracy of the movable detection assembly, thereby also ensuring the positional accuracy of the position sensor 6. In addition, the connecting and fixing assembly can further strengthen the connection between the guide shaft 2 and the support 1.

[0046] Of course, the present application does not exclude the use of other methods to fix the guide shaft 2 and the support 1, such as welding, etc., in which case there is no need to set up additional connecting and fixing components.

[0047] In some embodiments, a guide shaft connection hole is provided at one end of the guide shaft 2 that passes through the support through hole, and the support 1 is further provided with a plurality of support connection holes that are spaced apart in sequence around the support through hole. The connection and fixing assembly includes a mounting plate 9, a middle connecting piece 7, and a plurality of side connecting pieces 8. The mounting plate 9 is provided with a middle plate connection hole aligned with the guide shaft connection hole, and a plurality of plate side connection holes that are aligned with the plurality of support connection holes. In addition, the plate surface of the mounting plate 9 abuts against the surface of the support 1, the middle connecting piece 7 connects and fixes the middle plate connection hole and the guide shaft connection hole, and the mutually aligned plate side connection holes and support connection holes are connected and fixed by the side connecting piece 8.

[0048] Through the arrangement of this embodiment, the mounting plate 9, the middle connecting piece 7 and the multiple side connecting pieces 8 provide multiple connection and fixing points for the guide shaft 2 and the support 1, thereby further improving the connection stability between the guide shaft 2 and the support 1, and more effectively ensuring that the guide shaft 2 is not easily deflected by external forces.

[0049] For example, refer to Figure 1and Figure 2 The middle connecting member 7 can be a middle bolt, the screw portion of which is threadedly engaged with the guide shaft connection hole, and the head of which is pressed against the mounting plate 9. In addition, the side connecting member 8 can be a side bolt, the screw portion of which is threadedly engaged with the corresponding support connection hole, and the head of which is pressed against the mounting plate 9.

[0050] In some embodiments, a pressure block limiting structure 51 is provided at one axial end of the movable pressure block 5 facing the support 1 to prevent the movable sleeve 4 from slipping out. Furthermore, the pressure block limiting structure 51 prevents the movable pressure block 5 from sliding out of the movable sleeve 4 due to inertia when the elastic member 3 elastically resets. For example, the pressure block limiting structure 51 may be an annular limiting portion formed at the end of the sleeve hole (which receives the movable sleeve 4) of the movable pressure block 5. The provision of the pressure block limiting structure 51 can improve the stability and reliability of the arm position detection device.

[0051] In some embodiments, a guide shaft limiting structure 21 is provided at one axial end of the guide shaft 2 that passes through the movable pressure block 5, for limiting the escape of the movable sleeve 4. For example, the guide shaft limiting structure 21 may be a shoulder formed at the end of the guide shaft 2. The provision of the guide shaft limiting structure 21 also improves the stability and reliability of the arm position detection device.

[0052] In some embodiments, the axial ends of the elastic member 3 are respectively connected to the support 1 and the movable sleeve 4. Of course, the present application does not limit the situation where the axial ends of the elastic member 3 are respectively connected to the support 1 and the movable pressure block 5. Moreover, the elastic member 3 can be fixedly connected to the support 1 and the movable sleeve 4 (or the movable pressure block 5), or it can be elastically pre-pressed only between the support 1 and the movable sleeve 4 (or the movable pressure block 5). It can be set accordingly according to actual needs.

[0053] In some embodiments, there are multiple guide shafts 2, movable sleeves 4 and elastic members 3. The multiple guide shafts 2 are arranged parallel to each other and spaced apart and are respectively sleeved with multiple movable sleeves 4. The multiple movable sleeves 4 are all sleeved and fixed in the movable pressure block 5. The multiple elastic members 3 are respectively arranged corresponding to the multiple guide shafts 2.

[0054] By adopting the technical means in the aforementioned multiple embodiments, when multiple guide shafts 2 are provided, it can be effectively ensured that the multiple guide shafts 2 remain parallel to each other and are less likely to get stuck.

[0055] In addition, the second exemplary embodiment of the present application also provides a single-cylinder latch telescopic mechanism, which includes the above-mentioned arm position detection device. The arm position detection device is generally installed on the telescopic cylinder of the single-cylinder latch telescopic mechanism and can move with the telescopic cylinder when the telescopic cylinder performs a telescopic action.

[0056] Furthermore, the third exemplary embodiment of the present application also provides a telescopic arm assembly comprising the single-cylinder latch telescopic mechanism, and the telescopic arm body with multiple telescopic arm sections in the telescopic arm assembly can be realized by using the single-cylinder latch telescopic mechanism. For example, the telescopic arm assembly of the present application can be applied in different types of machines such as truck cranes, pump trucks, aerial work platforms, etc.

[0057] In the description of the present application, it should be understood that the terms "first", "second" are used only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined as "first", "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "multiple" is at least two, for example, two, three, etc., unless otherwise specifically limited.

[0058] In the present application, unless otherwise specifically defined and limited, the terms "mounting", "connecting", "connecting", "fixing" and other terms should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected or communicate with each other; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise specifically limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0059] In the description of the present application, the description of the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In the present application, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples. In addition, those skilled in the art can combine and combine the different embodiments or examples described in the present application and the features of the different embodiments or examples without contradiction.

[0060] Although the embodiments of the present application have been shown and described above, it should be understood that the above embodiments are exemplary and cannot be understood as limiting the present application, and those skilled in the art can make changes, modifications, replacements and variations to the above embodiments within the scope of the present application.

Claims

1. Arm position detection device, characterized in that, include: Support (1); A guide shaft (2) is connected and fixed to the support (1); A movable detection assembly, comprising a movable sleeve (4), a movable pressure block (5) and a position sensor (6), wherein the position sensor (6) is fixed on the movable pressure block (5) and is used to sense the arm segment sensing structure on the telescopic arm segment, the movable sleeve (4) is sleeved and fixed in the movable pressure block (5), and the movable sleeve (4) is sleeved outside the guide shaft (2) in an axially movable manner and forms rolling contact with the guide shaft (2); and The elastic member (3) is arranged along the axial direction of the guide shaft (2), and the axial ends of the elastic member (3) are respectively connected to the support (1) and the activity detection component.

2. The arm position detection device according to claim 1, characterized in that: The movable sleeve (4) is a linear bearing.

3. The arm position detection device according to claim 1, characterized in that: The support (1) is provided with a support through hole, the guide shaft (2) passes through the support through hole and forms a clearance fit with the support through hole, and the arm position detection device further comprises a connecting and fixing component for connecting and fixing the guide shaft (2) and the support (1).

4. The arm position detection device according to claim 3, characterized in that: One end of the guide shaft (2) passing through the support through hole is provided with a guide shaft connecting hole, and the support (1) is further provided with a plurality of support connecting holes arranged in sequence and spaced around the support through hole, and the connecting and fixing assembly comprises a mounting plate (9), a middle connecting piece (7) and a plurality of side connecting pieces (8), and the mounting plate (9) is provided with a middle connecting hole aligned with the guide shaft connecting hole and a plurality of side connecting holes aligned with the plurality of support connecting holes respectively; The surface of the mounting plate (9) abuts against the surface of the support (1), the middle connecting piece (7) connects and fixes the middle connecting hole of the plate and the guide shaft connecting hole, and the mutually aligned edge connecting holes of the plate and the support connecting holes are connected and fixed by the edge connecting piece (8).

5. The arm position detection device according to claim 4, characterized in that: The middle connecting piece (7) is a middle bolt, the screw portion of the middle bolt forms a threaded fit with the guide shaft connecting hole, and the head of the middle bolt is pressed against the mounting plate (9); the side connecting piece (8) is a side bolt, the screw portion of the side bolt forms a threaded fit with the corresponding support connecting hole, and the head of the side bolt is pressed against the mounting plate (9).

6. The arm position detection device according to claim 1, characterized in that: The movable pressing block (5) is provided with a pressing block limiting structure (51) at one axial end facing the support (1) for limiting the movable sleeve (4) from falling out; And / or, one axial end of the guide shaft (2) passing through the movable pressure block (5) is provided with a guide shaft limiting structure (21) for limiting the movable sleeve (4) from coming out.

7. The arm position detection device according to claim 1, characterized in that: The axial ends of the elastic member (3) are respectively connected to the support (1) and the movable sleeve (4).

8. The arm position detection device according to any one of claims 1 to 7, characterized in that: The guide shaft (2), the movable sleeve (4) and the elastic member (3) are each provided in plurality. The plurality of guide shafts (2) are arranged in parallel with each other and spaced apart and are respectively sleeved with the plurality of movable sleeves (4). The plurality of movable sleeves (4) are all sleeved and fixed in the movable pressure block (5). The plurality of elastic members (3) are respectively provided corresponding to the plurality of guide shafts (2).

9. Single cylinder bolt retractable mechanism, characterized in that: It comprises the arm position detection device according to any one of claims 1 to 8.

10. Telescopic arm assembly, characterized in that: It includes the single-cylinder latch retracting mechanism according to claim 9.

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