A pressure head assembly for a sensor

Abstract

The present invention discloses a pressure head assembly for a sensor, comprising an upper pressure head, a flexible limiting sleeve, a steel ball and a lower pressure head; the upper pressure head is a rod-shaped structure, which is provided with three sections along the axial direction, namely an upper threaded section, a first upper cylinder and a second upper cylinder, the second upper cylinder is located at the end of the upper pressure head, an upper annular groove is provided between the first upper cylinder and the second upper cylinder; the end face of the second upper cylinder is provided with an upper spherical inner cavity; the lower pressure head has the same structure as the upper pressure head. The upper pressure head and the lower pressure head have the same axis, the upper spherical inner cavity and the lower spherical inner cavity are opposite and are provided with a gap, and the steel ball is provided between the upper spherical inner cavity and the lower spherical inner cavity; the flexible limiting sleeve is provided between the upper annular groove and the lower annular groove, and completely wraps the second upper cylinder, the second lower cylinder and the gap between the upper spherical inner cavity and the lower spherical inner cavity. It is ensured that the shaking of the steel ball is greatly reduced when the belt scale is running, and the accuracy and stability of the weighing data are ensured.

Description

Technical Field

[0001] The invention belongs to the field of weighing sensors and relates to a pressure head assembly for the sensor. Background Art

[0002] With the continuous development of industrial Internet, Internet of Things and automation, intelligent weighing is increasingly used in logistics, sorting and other fields. As an important component for intelligent weighing data perception, sensors are usually used on belt scales. Four sensors are installed at the four corners below a belt scale. The sensor and the belt scale are connected through a pressure head assembly.

[0003] However, in actual application, the pressure head assembly has a big problem. The main problem is that after the belt is running, the entire weighing platform vibrates, causing the steel ball in the pressure head assembly under at least one corner of the belt scale to shake greatly, causing the weighing data to jump, which seriously interferes with the stability and accuracy of subsequent data processing and weighing display. Summary of the invention

[0004] The purpose of the present invention is to overcome the shortcomings of the above-mentioned prior art and provide a pressure head assembly for a sensor to ensure that the shaking of the steel ball is greatly reduced when the belt scale is running, thereby ensuring the accuracy and stability of the weighing data.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A pressure head assembly for a sensor, comprising an upper pressure head, a flexible limit sleeve, a steel ball and a lower pressure head;

[0007] The upper pressure head is a rod-shaped structure, which is provided with three sections along the axial direction, namely, an upper threaded section, a first upper cylinder and a second upper cylinder, the second upper cylinder is located at the end of the upper pressure head, an upper annular groove is provided between the first upper cylinder and the second upper cylinder; an upper spherical inner cavity is provided on the end surface of the second upper cylinder;

[0008] The lower pressure head is a rod-shaped structure, which is arranged in three sections along the axial direction, namely the lower threaded section, the first lower cylinder and the second lower cylinder, the second lower cylinder is located at the end of the lower pressure head, and a lower annular groove is arranged between the first lower cylinder and the second lower cylinder; a lower spherical inner cavity is arranged on the end face of the second lower cylinder.

[0009] The axes of the upper pressure head and the lower pressure head coincide with each other, the upper spherical inner cavity and the lower spherical inner cavity are opposite to each other and are arranged with a gap, and the steel ball is arranged between the upper spherical inner cavity and the lower spherical inner cavity;

[0010] The flexible limiting sleeve is arranged between the upper annular groove and the lower annular groove, and completely covers the second upper cylinder, the second lower cylinder and the gap between the upper spherical inner cavity and the lower spherical inner cavity.

[0011] Preferably, the gap distance between the upper spherical inner cavity and the lower spherical inner cavity is greater than the width of the upper annular groove and the lower annular groove.

[0012] Preferably, the first upper cylinder is provided with at least one set of two mutually parallel planes inwardly along the diameter direction of the cylinder; and the first lower cylinder is provided with at least one set of two mutually parallel planes inwardly along the diameter direction of the cylinder.

[0013] Preferably, the first upper cylinder is provided with an upper through hole along the diameter direction of the cylinder; and the first lower cylinder is provided with a lower through hole along the diameter direction of the cylinder.

[0014] Preferably, the first upper cylinder is provided with an axial threaded hole, and the upper threaded section serves as the internal thread in the threaded hole of the first upper cylinder; the first lower cylinder is provided with an axial threaded hole, and the lower threaded section serves as the internal thread in the threaded hole of the first lower cylinder.

[0015] Furthermore, the first upper cylinder is provided with an upper blind hole along the diameter direction of the cylinder; and the first lower cylinder is provided with a lower blind hole along the diameter direction of the cylinder.

[0016] Preferably, the flexible limiting sleeve is made of any one of rubber, resin, fiber and plastic.

[0017] Preferably, the hardness of the flexible limiting sleeve is between 20 and 45 HA.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] When the pressure head assembly of the present invention is connected to the weighing platform and the sensor, on the one hand, since a steel ball is arranged between the upper and lower pressure heads, the pressure head assembly as a whole can have a certain tilting ability, which is more convenient for the installation of the weighing platform and the sensor; on the other hand, since the flexible limit sleeve is wrapped around the outer side of the steel ball, the shaking of the steel ball can be greatly reduced when the belt scale is running, thereby ensuring the accuracy and stability of the weighing data.

[0020] Furthermore, mutually parallel planes are arranged on the first upper cylinder and the first lower cylinder, and the set of planes can be fixed by using a tool, thereby tightening the nut.

[0021] Furthermore, the upper through hole and the lower through hole are used as process holes. During tightening, tools are used to fix the upper through hole and the lower through hole to achieve the tightening of the press head thread and the bolt.

[0022] Furthermore, the upper blind hole and the lower blind hole are used as process holes. During tightening, tools are used to fix the upper blind hole and the lower blind hole to achieve the tightening of the press head thread and the bolt. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 A schematic structural diagram of a pressure head assembly of a dynamic scale sensor provided by the present invention;

[0024] Figure 2 A schematic diagram of the upper pressure head structure of a pressure head assembly of a dynamic scale sensor provided by the present invention;

[0025] Figure 3 Dynamic weighing curve for the sensor and existing pressure head assembly on a belt scale;

[0026] Figure 4 A curve of dynamic weighing of the sensor and the pressure head assembly provided by the present invention on a belt scale;

[0027] Figure 5 Another structural schematic diagram of a pressure head assembly of a dynamic scale sensor provided by the present invention;

[0028] Figure 6 Another structural schematic diagram of a pressure head assembly of a dynamic scale sensor provided by the present invention;

[0029] Figure 7 Another structural schematic diagram of a pressure head assembly of a dynamic scale sensor provided by the present invention.

[0030] Among them: 1-upper pressure head; 2-flexible limit sleeve; 3-steel ball; 4-lower pressure head; 1-a-upper threaded section; 1-b-first upper cylinder; 1-c-upper annular groove; 1-d-second upper cylinder; 1-f-upper through hole; 1-g-upper blind hole; 4-a-lower threaded section; 4-b-first lower cylinder; 4-c-lower annular groove; 4-d-second lower cylinder; 4-f-lower through hole; 4-g-lower blind hole. DETAILED DESCRIPTION

[0031] The present invention is further described in detail below in conjunction with the accompanying drawings:

[0032] like Figure 1 As shown, the sensor pressure head assembly of the present invention comprises an upper pressure head 1, a flexible limit sleeve 2, a steel ball 3 and a lower pressure head 4. The upper pressure head 1 and the lower pressure head 4 have completely the same structure.

[0033] like Figure 2 As shown, the upper pressure head 1 is a rod-shaped structure, which is provided with three sections along the axial direction, namely, an upper threaded section 1-a, a first upper cylinder 1-b and a second upper cylinder 1-d, the second upper cylinder 1-d is located at the end of the upper pressure head 1, an upper annular groove 1-c is provided between the first upper cylinder 1-b and the second upper cylinder 1-d; an upper spherical inner cavity 1-e is provided on the end surface of the second upper cylinder 1-d;

[0034] The lower pressure head 4 is a rod-shaped structure, which is arranged in three sections along the axial direction, namely the lower threaded section 4-a, the first lower cylinder 4-b and the second lower cylinder 4-d. The second lower cylinder 4-d is located at the end of the lower pressure head 4, and a lower annular groove 4-c is arranged between the first lower cylinder 4-b and the second lower cylinder 4-d; a lower spherical inner cavity 4-e is arranged on the end face of the second lower cylinder 4-d.

[0035] The upper pressure head 1 and the lower pressure head 4 have the same axis, the upper spherical inner cavity 1-e and the lower spherical inner cavity 4-e are opposite and are arranged with a gap, and the steel ball 3 is arranged between the upper spherical inner cavity 1-e and the lower spherical inner cavity 4-e. The gap distance between the upper spherical inner cavity 1-e and the lower spherical inner cavity 4-e is greater than the width of the upper annular groove 1-c and the lower annular groove 4-c.

[0036] The flexible limiting sleeve 2 is arranged between the upper annular groove 1-c and the lower annular groove 4-c, completely wrapping the second upper cylinder 1-d, the second lower cylinder 4-d and the gap between the upper spherical inner cavity 1-e and the lower spherical inner cavity 4-e.

[0037] The flexible limiting sleeve 2 is made of any one of rubber, resin, fiber and plastic. The hardness of the flexible limiting sleeve 2 is between 20 and 45 HA.

[0038] The first upper cylinder 1-b is provided with at least one set of two mutually parallel planes inwardly along the diameter direction of the cylinder; the first lower cylinder 4-b is provided with at least one set of two mutually parallel planes inwardly along the diameter direction of the cylinder. The purpose of providing at least one set of mutually parallel planes is to use a tool to fix the set of planes, thereby tightening the nut.

[0039] During installation, if there is a deviation between the belt scale mounting hole and the sensor mounting hole, the angle of the upper pressure head 1 or the lower pressure head 4 can be adjusted to ensure smooth installation.

[0040] During the operation of the belt scale, the scale platform usually vibrates significantly. The existing pressure head assembly can freely shake in the spherical cavity because the steel ball 3 has no limit, resulting in unstable weighing data. The dynamic weighing curve of a certain type of belt scale equipped with an existing pressure head is as follows: Figure 3 As shown. Figure 3 It can be clearly seen from the curve that there are obvious data jumps when the belt scale is running without load and when weighing, which brings great trouble to the back-end data processing.

[0041] The dynamic weighing curve of the pressure head assembly proposed by the present invention on the belt scale is as follows: Figure 4 As shown. Due to the setting of the flexible limit sleeve 2 of the pressure head assembly proposed in the present invention, the shaking of the steel ball 3 is limited, making the dynamic weighing data more stable and accurate. Figure 3Compared with the curve shown in the figure, the data during no-load operation and weighing have been significantly improved and enhanced, and the effect is remarkable.

[0042] Another structural diagram of the pressure head assembly proposed in this embodiment is as follows Figure 5 As shown, the parallel surfaces on the first upper cylinder 1-b and the first lower cylinder 4-b are no longer set. Instead, the first upper cylinder 1-b is provided with an upper through hole 1-f along the diameter direction of the cylinder; the first lower cylinder 4-b is provided with a lower through hole 4-f along the diameter direction of the cylinder. The upper through hole 1-f and the lower through hole 4-f are used as process holes. When tightening, tools are used to fix the upper through hole 1-f and the lower through hole 4-f, and the tightening of the pressure head thread and the bolt can also be achieved.

[0043] Another structural diagram of the pressure head assembly proposed in this embodiment is as follows Figure 6 As shown, the upper thread segment 1-a and the first upper cylinder 1-b are integrated into one body, the thread is set as an internal thread, and the upper thread segment 1-a serves as the internal thread in the threaded hole of the first upper cylinder 1-b. The lower thread segment 4-a and the first lower cylinder 4-b are integrated into one body, the thread is set as an internal thread, and the lower thread segment 4-a serves as the internal thread in the threaded hole of the first lower cylinder 4-b.

[0044] Another structural diagram of the pressure head assembly proposed in this embodiment is as follows Figure 7 As shown, keep Figure 6 The structure is the same as that in the embodiment of the present invention, but the parallel surfaces on the first upper cylinder 1-b and the first lower cylinder 4-b are no longer provided. Instead, the first upper cylinder 1-b is provided with an upper blind hole 1-g along the diameter direction of the cylinder; the first lower cylinder 4-b is provided with a lower blind hole 4-g along the diameter direction of the cylinder. The upper blind hole 1-g and the lower blind hole 4-g are used as process holes. When tightening, the upper blind hole 1-g and the lower blind hole 4-g are fixed with a tool, and the tightening of the press head thread and the bolt can also be achieved.

[0045] The above contents are only for explaining the technical idea of ​​the present invention and cannot be used to limit the protection scope of the present invention. Any changes made on the basis of the technical solution in accordance with the technical idea proposed by the present invention shall fall within the protection scope of the claims of the present invention.

Claims

1. A pressure head assembly for a sensor, characterized in that: It comprises an upper pressure head (1), a flexible limit sleeve (2), a steel ball (3) and a lower pressure head (4); The upper pressure head (1) is a rod-shaped structure, which is provided with three sections along the axial direction, namely an upper threaded section (1-a), a first upper cylinder (1-b) and a second upper cylinder (1-d), the second upper cylinder (1-d) being located at the end of the upper pressure head (1), and an upper annular groove (1-c) being provided between the first upper cylinder (1-b) and the second upper cylinder (1-d); an upper spherical inner cavity (1-e) is provided on the end surface of the second upper cylinder (1-d); The lower pressure head (4) is a rod-shaped structure, which is provided with three sections along the axial direction, namely, a lower threaded section (4-a), a first lower cylinder (4-b) and a second lower cylinder (4-d), the second lower cylinder (4-d) being located at the end of the lower pressure head (4), and a lower annular groove (4-c) being provided between the first lower cylinder (4-b) and the second lower cylinder (4-d); a lower spherical inner cavity (4-e) is provided on the end surface of the second lower cylinder (4-d); The axes of the upper pressure head (1) and the lower pressure head (4) coincide with each other, the upper spherical inner cavity (1-e) and the lower spherical inner cavity (4-e) are opposite to each other and are arranged with a gap, and the steel ball (3) is arranged between the upper spherical inner cavity (1-e) and the lower spherical inner cavity (4-e); The flexible limiting sleeve (2) is arranged between the upper annular groove (1-c) and the lower annular groove (4-c), and completely covers the second upper cylinder (1-d), the second lower cylinder (4-d) and the gap between the upper spherical inner cavity (1-e) and the lower spherical inner cavity (4-e); The gap distance between the upper spherical inner cavity (1-e) and the lower spherical inner cavity (4-e) is greater than the width of the upper annular groove (1-c) and the lower annular groove (4-c); The first upper cylinder (1-b) is provided with at least one set of two mutually parallel planes inwardly along the diameter direction of the cylinder; and the first lower cylinder (4-b) is provided with at least one set of two mutually parallel planes inwardly along the diameter direction of the cylinder.

2. The sensor pressure head assembly according to claim 1, characterized in that: The first upper cylinder (1-b) is provided with an upper through hole (1-f) along the diameter direction of the cylinder; the first lower cylinder (4-b) is provided with a lower through hole (4-f) along the diameter direction of the cylinder.

3. The sensor pressure head assembly according to claim 1, characterized in that: The first upper cylinder (1-b) is provided with an axial threaded hole, and the upper threaded section (1-a) serves as an internal thread in the threaded hole of the first upper cylinder (1-b); the first lower cylinder (4-b) is provided with an axial threaded hole, and the lower threaded section (4-a) serves as an internal thread in the threaded hole of the first lower cylinder (4-b).

4. The sensor pressure head assembly according to claim 3, characterized in that: The first upper cylinder (1-b) is provided with an upper blind hole (1-g) along the diameter direction of the cylinder; the first lower cylinder (4-b) is provided with a lower blind hole (4-g) along the diameter direction of the cylinder.

5. The sensor pressure head assembly according to claim 1, characterized in that: The flexible limiting sleeve (2) is made of any one of rubber, resin, fiber and plastic.

6. The sensor pressure head assembly according to any one of claims 1 to 5, characterized in that: The hardness of the flexible limiting sleeve (2) is between 20 and 45 HA.

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