Foot assembly

Abstract

The present invention belongs to the technical field of instruments and equipment, and specifically relates to a foot assembly, which is installed on the side or bottom corner of the instrument and equipment, and plays the role of support, connection, etc., and also has a precise positioning function, and can be applied to electronic equipment or other types of applications with high requirements for reliability and docking accuracy. The foot assembly can connect the instrument and equipment with the installation base as a whole, and plays the role of support, connection, etc., and also has a positioning function. By setting a positioning boss along the edge of the foot and forming a positioning matching structure with the instrument and equipment at the installation interface, the degree of freedom of the corresponding part of the instrument and equipment can be limited; by combining and using a plurality of mirror-image foot parts, the six degrees of freedom of the instrument and equipment in three directions in space can be completely limited, and finally a reliable and precise connection between the equipment and the installation base is achieved.

Description

Technical Field

[0001] The present invention belongs to the technical field of instruments and equipment, and specifically relates to a base assembly, which is installed on the side or bottom corner of the instrument and equipment to play the role of support and fixation, and at the same time has a precise positioning function. It can be applied to electronic equipment or other types of applications with high requirements on reliability and docking accuracy. Background Art

[0002] According to the definition in Article 4.3.42 of the national standard GB / T8582-2008 "Terms of Mechanical Structure of Electrical and Electronic Equipment", the foot is "a component that supports the housing and prevents it from directly contacting the mounting surface". The foot is usually installed at the bottom of the instrument and equipment, and plays the role of supporting and connecting the instrument and equipment to the mounting base. In certain occasions, it can also have a positioning function. The strength and positioning accuracy of the foot are related to the working reliability and stability of the instrument and equipment, and have a great impact on the safe and reliable operation of the whole machine.

[0003] The existing base feet can be divided into straight plate shape and "L" shape according to their shapes. According to the installation position, there are two forms: bottom installation and side installation, see Figure 1 (a), Figure 1 (b), and Figure 1 (c). The two existing forms of base feet are in simple surface contact with the equipment, and are fixed by welding or threaded connection. When the equipment and the base feet are connected by welding, the disadvantage is that the high heat generated during welding can easily cause deformation of the plate, resulting in low positioning accuracy. In addition, when the equipment casing and the base feet are made of different materials, it will cause difficulties in the welding process. When the equipment and the base feet are connected by threaded connection, the disadvantage is that the impact and vibration loads of the base are transmitted to the equipment through screws, the reliability is low and the overall strength advantage of the base foot material cannot be brought into play. At the same time, the fitting clearance in the threaded connection will also reduce the positioning accuracy, which is limited in application in situations where higher positioning accuracy is required. Summary of the invention

[0004] 1. Technical issues to be resolved

[0005] The technical problem to be solved by the present invention is: how to provide a base structure that can give full play to the overall strength advantage of the base material, achieve high-precision and high-reliability docking under high loads, and at the same time can be produced under normal process conditions without causing additional process difficulties.

[0006] (II) Technical solution

[0007] In order to solve the above technical problems, the present invention provides a foot assembly, which is used to be installed on a device housing to position and fix the device housing. The coordinate system of the installation process of the foot assembly and the device housing is defined as follows:

[0008] Define the vertical direction of the device shell upward as the positive direction of the Z axis, the vertical direction downward as the negative direction of the Z axis, the left direction as the positive direction of the X axis, the right direction as the negative direction of the X axis, the forward direction as the positive direction of the Y axis, and the backward direction as the negative direction of the Y axis;

[0009] Based on the above coordinate system, the foot assembly is provided with four feet, which are respectively installed at the four corners of the equipment housing; the four feet are divided into a left front foot, a right rear foot, a left rear foot and a right rear foot, and the four feet are divided into two structures that are mirror images of each other; specifically: the left front foot and the right rear foot have the same structure and are the same part; the left rear foot and the right front foot have the same structure and are the same part, and the left front foot, the right rear foot and the left rear foot, the right front foot are mirror images symmetrical along the Y axis;

[0010] The left front foot 21, the right rear foot 25, the left rear foot 24 and the right front foot 26 respectively include: a foot body and a positioning boss 1; the foot body is provided with a contact surface for cooperating with the device housing 3 and a bottom surface for contacting the mounting base, the edge of the contact surface is provided with a mounting boss 1, and the contact surface is also provided with a mounting hole 2 for connecting the foot body and the device housing 3 to each other through the mounting hole 2 by a connecting screw 22;

[0011] The positioning boss 1 is an "L"-shaped structure, that is, it includes a horizontal portion arranged along the upper edge of the contact surface and a vertical portion integrally connected to the horizontal portion, and the vertical portion is arranged to extend downward along one side edge of the contact surface;

[0012] A semi-open mounting groove is provided on the corresponding position of the mounting surface on the device housing for matching the contact surface. After the base body and the device housing 3 are connected as one using the connecting screws 22, the "L"-shaped positioning boss 1 on the base body and the mounting groove of the device housing 3 form a semi-embedded structure. A single base is used to limit part of the freedom of the device in the corresponding direction. The combination of two groups of four bases that are mirror images of each other can achieve complete positioning and reliable connection of the six degrees of freedom of the device housing 3 in three directions, thereby achieving precise positioning and highly reliable installation of the entire machine.

[0013] Wherein, a guiding slope 3 is provided on the open end of the horizontal portion of the “L”-shaped positioning boss 1 .

[0014] Wherein, the base body is a seat structure with a triangular side.

[0015] Wherein, the mounting hole 2 is arranged in the middle of the contact surface.

[0016] The left front foot and the right rear foot have the same structure and are the same part; the left rear foot and the right front foot have the same structure and are the same part, and the left front foot and the right rear foot are in a mirror image relationship symmetrical along the Y axis, which means:

[0017] The vertical parts of the positioning bosses 1 on the left front base and the right rear base extend downward along the same side edge of the contact surface, and the vertical parts of the positioning bosses 1 on the left rear base and the right front base extend downward along the same side edge of the contact surface, and the vertical parts of the positioning bosses 1 on the left front base and the right rear base are on different sides of the side edges of the contact surfaces along which the vertical parts of the positioning bosses 1 on the left rear base and the right front base are located, thereby forming mirror images of the left front base and the right front base along the Y-axis, and the left rear base and the right rear base are mirror images of each other along the Y-axis during use.

[0018] Among them, when the left front foot is installed, the device housing 3 can be limited in the two-way translational freedom along the Z axis, the positive direction of the X axis, the positive direction of the Y axis, and the rotational freedom around the X axis;

[0019] The right rear base foot is the same part with the left front base foot in structure, but is installed at the right rear position of the equipment housing. After the right rear base foot is installed, it can limit the equipment's translational freedom in both directions along the Z axis, the negative direction of the X axis, the negative direction of the Y axis, and the rotational freedom around the X axis; the combination of the left front base foot and the right rear base foot can limit the equipment's translational freedom in three directions in space and two rotational freedoms around the X axis and the Y axis.

[0020] Among them, in theory, only a simple one-way positioning structure needs to be set in the XY plane to limit the remaining only rotational freedom around the Z axis; but in actual engineering applications, in order to improve the reliability of the connection, especially the connection reliability when the equipment is subjected to moment loads in the XY plane, a reinforced auxiliary structure needs to be set; for this purpose, two more feet are installed on the left rear and right front parts of the equipment housing. The two feet are exactly the same in structure and are the same part, but they are mirror images of the left front foot and the right rear foot, and have different structures and are not interchangeable; so far, the combination of two structures and a total of four feet completes the complete positioning and reliable connection of the equipment.

[0021] Among them, the cooperation between the "L"-shaped positioning boss 1 on the base body and the mounting groove of the equipment housing 3 can be based on actual conditions, after comprehensively considering the load, precision, and processing cost factors, and select appropriate cooperation properties and tolerance grades in transition fit or interference fit.

[0022] (III) Beneficial effects

[0023] Compared with the prior art, the present invention has made the following two structural improvements to the "L"-shaped foot: (1) an "L"-shaped positioning boss is arranged along the edge of the foot, corresponding to the semi-open positioning groove on the installation surface of the instrument and equipment. After the two are assembled, the partial freedom of the instrument and equipment can be restricted, and high-reliability load-bearing of the foot can be achieved; (2) the mirror-image foot parts are used in combination to completely restrict the six degrees of freedom of the equipment in three directions in space, thereby achieving precise positioning of the entire machine and high-reliability installation. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figures 1(a), 1(b) and 1(c) are schematic diagrams of existing foot installation structures, wherein Figure 1(a) is a straight-plate foot installed at the bottom, Figure 1(b) is a straight-plate foot installed at the side, and Figure 1(c) is an "L"-shaped foot installed at the side.

[0025] Among them, 11: foot; 12: equipment shell;

[0026] Fig. 2(a) and Fig. 2(b) are schematic diagrams of the installation structure of the base assembly of the present invention, wherein Fig. 2(a) is a left upper perspective, and Fig. 2(b) is a right upper perspective.

[0027] Among them, 21: left front foot; 2: connecting screw; 3: equipment housing; 24: left rear foot; 25: right rear foot; 26: right front foot;

[0028] Figures 3(a), 3(b), 3(c) and 3(d) are schematic diagrams of the base foot parts structure of the present invention, wherein Figures 3(a) and 3(b) are the left front base foot and right rear base foot parts structure, and Figures 3(c) and 3(d) are the left rear base foot and right front base foot parts structure.

[0029] Among them, 1: positioning boss; 2: mounting hole; 3: guiding slope;

[0030] Fig. 4(a) and Fig. 4(b) are schematic diagrams of the device housing installation interface structure involved in the present invention, wherein Fig. 4(a) is the left front installation interface structure, and Fig. 4(b) is the left rear installation interface structure.

[0031] Among them, 41: left front mounting groove; 2: mounting hole; 3: equipment housing; 44: left rear mounting groove. DETAILED DESCRIPTION

[0032] In order to make the purpose, content, and advantages of the present invention more clear, the specific implementation methods of the present invention are further described in detail below in conjunction with the accompanying drawings and examples.

[0033] To solve the problems of the prior art, the present invention provides a foot assembly, such as Figure 2(a) to Figure 4(b)As shown, the foot assembly is used to be installed on the device housing to position and fix the device housing. The coordinate system of the installation process of the foot assembly and the device housing is defined as follows:

[0034] Define the vertical direction of the device shell upward as the positive direction of the Z axis, the vertical direction downward as the negative direction of the Z axis, the left direction as the positive direction of the X axis, the right direction as the negative direction of the X axis, the forward direction as the positive direction of the Y axis, and the backward direction as the negative direction of the Y axis;

[0035] Based on the above coordinate system, the foot assembly is provided with four feet, which are respectively installed at the four corners of the equipment housing; the four feet are divided into a left front foot, a right rear foot, a left rear foot and a right rear foot, and the four feet are divided into two structures that are mirror images of each other, and each structure has two parts; specifically: the left front foot and the right rear foot have the same structure and are the same part, as shown in Figures 3(a) and (b); the left rear foot and the right front foot have the same structure and are the same part, as shown in Figures 3(c) and (d), and the left front foot, the right rear foot and the left rear foot, the right front foot are mirror images symmetrical along the Y axis, and have different structures;

[0036] The left front foot 21, the right rear foot 25, the left rear foot 24 and the right front foot 26 respectively include: a foot body and a positioning boss 1; the foot body is provided with a contact surface for cooperating with the device housing 3 and a bottom surface for contacting the mounting base, the edge of the contact surface is provided with a mounting boss 1, and the contact surface is also provided with a mounting hole 2 for connecting the foot body and the device housing 3 to each other through the mounting hole 2 by a connecting screw 22;

[0037] As shown in Fig. 3(a), Fig. 3(b), Fig. 3(c) and Fig. 3(d), the positioning boss 1 is an "L"-shaped structure, that is, it includes a horizontal portion arranged along the upper edge of the contact surface and a vertical portion integrally connected to the horizontal portion, and the vertical portion is arranged to extend downward along one side edge of the contact surface;

[0038] A semi-open mounting groove is provided at a corresponding position on the mounting surface on the device shell for matching the contact surface, as shown in Figures 4(a) and 4(b). The left mounting surface is shown in the figure, and mounting grooves are symmetrically provided on the right mounting surface of the device shell. After the base body and the device shell 3 are connected as one with the connecting screws 22, the "L"-shaped positioning boss 1 on the base body and the mounting groove of the device shell 3 form a semi-embedded structure. A single base is used to limit part of the freedom of the device in the corresponding direction. The combination of two groups of four bases that are mirror images of each other can achieve complete positioning and reliable connection of the six degrees of freedom of the device shell 3 in three directions, thereby achieving precise positioning and highly reliable installation of the entire machine.

[0039] In consideration of assembly processability, a guiding slope 3 is provided on the open end of the horizontal portion of the “L”-shaped positioning boss 1 , as shown in FIG3 .

[0040] Wherein, the base body is a seat structure with a triangular side.

[0041] Wherein, the mounting hole 2 is arranged in the middle of the contact surface.

[0042] The left front foot and the right rear foot have the same structure and are the same part; the left rear foot and the right front foot have the same structure and are the same part, and the left front foot and the right rear foot are in a mirror image relationship symmetrical along the Y axis, which means:

[0043] The vertical parts of the positioning bosses 1 on the left front base and the right rear base extend downward along the same side edge of the contact surface, and the vertical parts of the positioning bosses 1 on the left rear base and the right front base extend downward along the same side edge of the contact surface, and the vertical parts of the positioning bosses 1 on the left front base and the right rear base are on different sides of the side edges of the contact surfaces along which the vertical parts of the positioning bosses 1 on the left rear base and the right front base are located, thereby forming mirror images of the left front base and the right front base along the Y-axis, and the left rear base and the right rear base are mirror images of each other along the Y-axis during use.

[0044] Wherein, when the left front foot is installed, FIG3(a) is the left front foot positioning boss structure, and FIG4(a) is the left front mounting slot structure of the device housing. After the two are connected, with reference to the coordinate system in FIG2(a), the device housing (3) can be restricted in terms of the translational freedom in the bidirectional directions of the Z axis, the positive direction of the X axis, and the positive direction of the Y axis, and the rotational freedom around the X axis;

[0045] The right rear foot is the same part with the same structure as the left front foot, but it is installed at the right rear position of the device housing, refer to Figure 2(b). After the right rear foot is installed, it can limit the device's translational freedom along the Z axis, the negative direction of the X axis, the negative direction of the Y axis, and the rotational freedom around the X axis; the combination of the left front foot and the right rear foot can limit the device's translational freedom in three directions in space and the two rotational freedoms around the X axis and the Y axis.

[0046] Among them, in theory, only a simple one-way positioning structure needs to be set in the XY plane to limit the remaining only rotational freedom around the Z axis; but in actual engineering applications, in order to improve the reliability of the connection, especially the connection reliability when the equipment is subjected to moment loads in the XY plane, a reinforced auxiliary structure needs to be set; for this purpose, two more feet are installed on the left rear and right front parts of the equipment housing. The two feet are exactly the same in structure and are the same part, but they are mirror images of the left front foot and the right rear foot, and have different structures and are not interchangeable; so far, the combination of two structures and a total of four feet completes the complete positioning and reliable connection of the equipment.

[0047] Among them, the cooperation between the "L"-shaped positioning boss 1 on the base body and the mounting groove of the equipment housing 3 can be based on actual conditions, after comprehensively considering factors such as load, precision, and processing cost, and appropriate cooperation properties and tolerance grades can be selected in transition fit or interference fit.

[0048] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A foot assembly, which is used to be installed on a device housing to position and fix the device housing, characterized in that: The coordinate system for the installation process of the foot assembly and the equipment housing is defined as follows: Define the vertical direction of the device shell upward as the positive direction of the Z axis, the vertical direction downward as the negative direction of the Z axis, the left direction as the positive direction of the X axis, the right direction as the negative direction of the X axis, the forward direction as the positive direction of the Y axis, and the backward direction as the negative direction of the Y axis; Based on the above coordinate system, the foot assembly is provided with four feet, which are respectively installed at the four corners of the equipment housing; the four feet are divided into a left front foot, a right rear foot, a left rear foot and a right rear foot, and the four feet are divided into two structures that are mirror images of each other; specifically: the left front foot and the right rear foot have the same structure and are the same part; the left rear foot and the right front foot have the same structure and are the same part, and the left front foot, the right rear foot and the left rear foot, the right front foot are mirror images symmetrical along the Y axis; The left front foot (21), the right rear foot (25), the left rear foot (24) and the right front foot (26) respectively comprise: a foot body and a positioning boss (1); the foot body is provided with a contact surface for mating with the device housing (3) and a bottom surface for contacting the mounting base, the edge of the contact surface is provided with a mounting boss (1), and the contact surface is also provided with a mounting hole (2) for connecting the foot body and the device housing (3) to each other through the mounting hole (2) by means of a connecting screw (22); The positioning boss (1) is an "L"-shaped structure, that is, it comprises a horizontal portion arranged along the upper edge of the contact surface and a vertical portion integrally connected to the horizontal portion, wherein the vertical portion is arranged to extend downward along one side edge of the contact surface; A semi-open mounting groove is provided at a corresponding position on the mounting surface on the device housing for matching the contact surface. After the foot body and the device housing (3) are connected as one body using a connecting screw (22), an "L"-shaped positioning boss (1) on the foot body and the mounting groove of the device housing (3) form a semi-embedded structure. A single foot is used to limit part of the freedom of the device in a corresponding direction. The combination of two groups of four feet that are mirror images of each other can achieve complete positioning and reliable connection of the device housing (3) in six degrees of freedom in three directions, thereby achieving precise positioning of the entire device and highly reliable installation.

2. The foot assembly according to claim 1, characterized in that: A guiding inclined surface (3) is provided on the open end of the horizontal portion of the "L"-shaped positioning boss (1).

3. The foot assembly as claimed in claim 1, characterized in that: The base body is a seat structure with a triangular side.

4. The foot assembly according to claim 1, characterized in that: The mounting hole (2) is arranged in the middle of the contact surface.

5. The foot assembly as claimed in claim 1, characterized in that: The left front foot and the right rear foot have the same structure and are the same part; the left rear foot and the right front foot have the same structure and are the same part, and the left front foot and the right rear foot are in a mirror relationship symmetrical along the Y axis. The meaning is: The vertical portions of the positioning bosses (1) on the left front foot and the right rear foot extend downward along the same side edge of the contact surface, and the vertical portions of the positioning bosses (1) on the left rear foot and the right front foot extend downward along the same side edge of the contact surface, and the vertical portions of the positioning bosses (1) on the left front foot and the right rear foot are on different sides of the side edge of the contact surface along which the vertical portions of the positioning bosses (1) on the left rear foot and the right front foot are located, thereby forming mirror images of each other along the Y axis and mirror images of each other along the Y axis during use.

6. The foot assembly as claimed in claim 1, characterized in that: When the left front foot is installed, the device housing (3) can be restricted in terms of translational freedom in both directions of the Z axis, the positive direction of the X axis, the positive direction of the Y axis, and the rotational freedom around the X axis; The right rear base foot is the same part with the left front base foot in structure, but is installed at the right rear position of the equipment housing. After the right rear base foot is installed, it can limit the equipment's translational freedom in both directions along the Z axis, the negative direction of the X axis, the negative direction of the Y axis, and the rotational freedom around the X axis; the combination of the left front base foot and the right rear base foot can limit the equipment's translational freedom in three directions in space and two rotational freedoms around the X axis and the Y axis.

7. The foot assembly as claimed in claim 1, characterized in that: The fit between the "L"-shaped positioning boss (1) on the base body and the mounting groove of the device housing (3) is such that appropriate fit properties and tolerance levels are selected from transition fit or interference fit.

Images