Curved surface detection system of ergonomic chair back

Abstract

The invention provides a curved surface detection system of an ergonomic chair back, and relates to the technical field of irregular surface detection. Comprising a plurality of detection units, an adjusting unit for adjusting the plurality of detection units to a standard state, and a controller, the detection unit comprises a top contact piece used for abutting against the curved surface of the chair back to be detected, and the top contact piece is arranged in a sliding mode in the first direction; the first direction is perpendicular to the chair back to be detected; in a standard state, the top contact part is propped against the curved surface of the standard chair back; the deformation mechanism is arranged at the tail end of the top contact piece and deforms along with the sliding of the top contact piece; the pressure measuring mechanism is used for detecting pressure generated by deformation of the deformation mechanism and uploading the pressure to the controller; and the controller processes the received pressure and judges whether the curved surface of the chair back to be detected is qualified or not. According to the application, the curved surface bending shape of the chair back can be accurately detected, and the technical deficiency in the aspect at present is made up.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of irregular surface detection, and particularly relates to a curved surface detection system for an ergonomic chair back. BACKGROUND

[0002] An ergonomic chair is an office chair designed based on the ergonomic theory, combined with sitting posture data and manufacturing process. The design of the chair back is based on the physiological characteristics of human sitting posture, and the support structure is optimized according to the S-shaped curve of the spine to avoid the concentration of lumbar disc pressure. Therefore, in the process of manufacturing the chair, the detection of the chair back is an indispensable link.

[0003] A seat back detection device is disclosed in Chinese patent application No. CN208887547U. The chair back to be detected is placed on the base composed of a front seat, a rear seat and a side seat, the front end surface and the rear end surface of the chair back are respectively attached to the upper surfaces of the front seat and the rear seat, and the side surface of the chair back is detected by the detection rod on the side seat to determine whether the shape of the chair back conforms to the standard. However, the detection device cannot effectively detect the curved shape of the curved surface of the chair back.

[0004] Therefore, how to design a scheme capable of detecting the curved shape of the curved surface is one of the urgent problems to be solved. SUMMARY

[0005] The present application provides a curved surface detection system for an ergonomic chair back to at least solve the above technical problems in the prior art.

[0006] According to a first aspect of the present application, a curved surface detection system for an ergonomic chair back is provided, comprising a plurality of detection units, an adjusting unit for adjusting the plurality of detection units to a standard state, and a controller. The detection unit comprises: a top contact piece for top contact with the curved surface of the chair back to be detected, the top contact piece being slidingly arranged along a first direction; the first direction is perpendicular to the chair back to be detected; in the standard state, the top contact piece top contacts with the curved surface of the standard chair back; a deformation mechanism arranged at the end of the top contact piece and deformed with the sliding of the top contact piece; a pressure measuring mechanism for detecting the pressure generated by the deformation of the deformation mechanism and uploading to the controller; The controller processes the received pressure and determines whether the curved surface of the chair back to be detected is qualified.

[0007] In some embodiments of the first aspect of the present application, a pressing mechanism is further included, which provides a pressing force to the backrest to be tested towards the detection units corresponding to at least three detection units not in a straight line, so that the pressure detecting mechanism of the at least three detection units detects the reference pressure.

[0008] In some embodiments of the first aspect of the present application, the controller processes the received pressure and determines whether the curved surface of the backrest to be tested is qualified according to the following method: The absolute difference between each of the received pressure and the reference pressure is calculated, and the maximum absolute difference is compared with a first threshold value. If the maximum absolute difference is less than the first threshold value, the curved surface of the backrest to be tested is determined to be qualified, otherwise, the curved surface of the backrest to be tested is determined to be unqualified.

[0009] In some embodiments of the first aspect of the present application, the top contact includes: a sliding shaft, the top of the sliding shaft is provided with a contact point for contacting the curved surface of the backrest to be tested; a sliding sleeve, which is sleeved on the outside of the sliding shaft and is in sliding fit with the sliding shaft in a first direction.

[0010] In some embodiments of the first aspect of the present application, the deformation mechanism includes: an abutting portion, which is fixedly arranged at the middle of the sliding sleeve; a compression spring, which is arranged in the sliding sleeve, and the two ends of the compression spring are respectively in abutment with the end of the sliding shaft and the abutting portion; when the sliding shaft slides, the compression spring deforms.

[0011] In some embodiments of the first aspect of the present application, a first locking mechanism is arranged between the sliding shaft and the sliding sleeve, and the sliding shaft and the sliding sleeve are axially locked / unlocked during the adjustment of the detection units to the standard state; the first locking mechanism includes: a locking rod, which is fixed with the abutting portion and extends towards the side of the sliding shaft; a locking tongue, which is fixedly arranged at the top of the locking rod and extends outwardly along the radial direction of the locking rod; a locking hole, which is arranged at the end of the sliding shaft and is used for the insertion of the top of the locking rod and the locking tongue; a locking groove, which is arranged at the bottom of the locking hole and extends along the circumferential direction from the part of the locking hole corresponding to the locking tongue; The locking rod is inserted into the bottom of the locking hole, the sliding shaft is rotated to make the locking tongue enter the locking groove, the first locking mechanism is switched to the locked state, and the axial locking of the sliding shaft and the sliding sleeve is completed; the sliding shaft is reversely rotated to make the locking tongue disengage from the locking groove and enter the locking hole, the first locking mechanism is switched to the unlocked state, and the sliding shaft and the sliding sleeve are axially freely slidable.

[0012] In some embodiments of the first aspect of the present application, the end of the sliding shaft is provided with a first washer, the first washer is rotationally connected with the sliding shaft, and the compression spring is fixedly connected with the first washer.

[0013] In some embodiments of the first aspect of the present application, the pressure measuring mechanism comprises a ring-shaped hollow force sensor, which is arranged between the abutting portion and the compression spring, and the main body of the lock rod passes through the hollow area of the ring-shaped hollow force sensor.

[0014] In some embodiments of the first aspect of the present application, the adjusting unit comprises: a sealed cavity comprising at least one side fixed plate; a gas charging and discharging port for charging and discharging the sealed cavity; a sealed sliding channel arranged on the fixed plate and used for mounting the detection unit; the sliding sleeve is arranged in sealing fit with the sealed sliding channel in a first direction, and the end of the sliding sleeve extends into the sealed cavity; a second locking mechanism for axially locking / unlocking the sealed sliding channel and the sliding sleeve; During the adjustment of the adjusting unit, the standard chair back is placed on the detection units, the first locking mechanism is switched to the locked state, the second locking mechanism is switched to the unlocked state, the sealed cavity is inflated to make all the top contact pieces contact the curved surface of the standard chair back; then, the first locking mechanism is switched to the unlocked state, and the second locking mechanism is switched to the locked state, and the adjustment is completed.

[0015] In some embodiments of the first aspect of the present application, the second locking structure comprises: a sliding groove arranged on one side of the sealed sliding channel; a locking block arranged in the sliding groove and in sliding fit with the sliding groove; a locking bolt in threaded fit with the sealed sliding channel, the end of the locking bolt extends towards the locking block, and the locking block moves towards the sliding sleeve with the rotation of the locking bolt, and the axial locking of the sealed sliding channel and the sliding sleeve is completed when the locking block abuts against the surface of the sliding sleeve.

[0016] Compared with the prior art, the present application has the following beneficial effects: 1. In the present application, the curved surface of the to-be-detected chair back is contacted by the plurality of top contact pieces, the top contact pieces slide when the to-be-detected chair back is placed on the top contact pieces, the pressure generated by the deformation is detected by the pressure measuring mechanism, and finally the pressure is processed, so that the curved surface height of the to-be-detected chair back in each local area of the top contact piece can be analyzed, the curved shape of the to-be-detected chair back can be further judged by combining the curved surface height data of the plurality of top contact pieces, and finally whether the to-be-detected chair back is qualified can be judged. The present application can accurately detect the curved shape of the chair back, and makes up for the lack of the current technology in this aspect.

[0017] 2、The application adjusts the detection unit to the standard state before detection, and makes the top contact touch the curved surface of the standard chair back, so that the pressure detected by each detection unit and the pressure fed back to the chair back to be detected are balanced as much as possible when detecting the curved surface of the chair back to be detected, avoiding damage to the detection system or the chair back to be detected caused by excessive local pressure.

[0018] 3、The application applies pressure to multiple positions of the chair back to be detected during detection, avoiding the situation that the contacts of some detection units are empty, and the contacts are not in contact with the curved surface of the chair back to be detected, which will lead to that the detected pressure cannot accurately reflect the height difference of the curved surface of the chair back to be detected at the local position and other positions.

[0019] It should be understood that the content described in this part is not intended to identify the key or important features of the embodiments of the application, nor is it used to limit the scope of the application. Other features of the application will become apparent from the following description. BRIEF DESCRIPTION OF DRAWINGS

[0020] The above and other objects, features and advantages of the exemplary embodiments of the present application will be more apparent from the following detailed description read in conjunction with the accompanying drawings, in which: In the drawings, identical or corresponding reference numerals indicate identical or corresponding parts.

[0021] Figure 1 A side view of an ergonomic chair is shown.

[0022] Figure 2 A schematic diagram of the overall structure of the application is shown.

[0023] Figure 3 A sectional view of the application is shown.

[0024] Figure 4 A schematic diagram of Figure 3 A partial enlarged view at A in the schematic diagram.

[0025] Figure 5 A schematic diagram of Figure 4 A partial enlarged view at B in the schematic diagram.

[0026] Figure 6 A schematic diagram of Figure 4 A partial enlarged view at C in the schematic diagram.

[0027] Figure 7 A schematic diagram of Figure 2 A partial enlarged view at A in another state of the schematic diagram.

[0028] Figure 8 A schematic diagram of Figure 7A magnified view of a portion of point D in the middle.

[0029] Figure 9 A schematic diagram of the overall structure of the sliding shaft of this application is shown.

[0030] Figure 10 A schematic diagram of the overall structure of the sliding sleeve of this application is shown.

[0031] Figure 11 An explosion diagram of the detection unit of this application is shown.

[0032] Figure 12 A schematic diagram of the second locking mechanism of this application is shown.

[0033] Figure 13 One of the schematic diagrams of the adjustment standard state of this application is shown.

[0034] Figure 14 The second schematic diagram of the adjustment standard state of this application is shown.

[0035] Figure 15 A schematic diagram of the detection process of this application is shown.

[0036] Explanation of reference numerals in the attached figures: 1. Chair back to be tested; 1'. Standard chair back; 10. Detection unit; 11. Top contact element; 111. Sliding shaft; 1110. Contact point; 112. Sliding sleeve; 12. Deformation mechanism; 121. Abutment part; 122. Compression spring; 123. First washer; 124. Second washer; 13. Pressure measuring mechanism; 14. First locking mechanism; 141. Locking bar; 142. Locking tongue; 143. Locking hole; 144. Locking groove; 20. Adjustment unit; 21. Sealing cavity; 211. Fixing plate; 22. Inflation / depression port; 23. Sealing slide; 24. Second locking mechanism; 241. Slide groove; 242. Locking block; 243. Locking bolt; 30. Pressing mechanism; 31. Contact part. Detailed Implementation

[0037] To make the objectives, features, and advantages of this application more apparent and understandable, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0038] Example 1: A Curved Surface Detection System for Ergonomic Chair Backrests like Figure 1 As shown, in order to conform to the S-shaped curve of the human spine, the ergonomic chair back also presents an S-shaped curve. It is worth mentioning that the chair back not only presents an S-shaped curve in the longitudinal direction, but also conforms to the shape of the human back in the transverse direction. That is to say, the chair back also presents a concave curved shape in the middle in the transverse direction.

[0039] In the manufacturing process of ergonomic chairs, in order to conduct compliance testing on the curved shape of the chair back, this embodiment provides an ergonomic chair back curved surface testing system.

[0040] Please refer to Figure 2 The ergonomic chair back surface detection system of this embodiment includes a plurality of detection units 10, an adjustment unit 20 for adjusting the plurality of detection units 10 to a standard state, and a controller.

[0041] The plurality of detection units 10 are arranged in an array on the same plane. During the detection process, the chair back to be tested is placed on the plurality of detection units 10. Each detection unit 10 can detect local displacement of the chair back and upload it to the controller. The controller then analyzes and processes the received pressure data to determine whether the local curvature of the chair back is qualified.

[0042] The following is a detailed introduction to each functional unit.

[0043] Please refer to Figure 3 and Figure 4 The detection unit 10 includes a top contact 11, a deformation mechanism 12, and a pressure measuring mechanism 13.

[0044] The top contact member 11 is used to contact the curved surface of the chair back to be tested, and the top contact member 11 is slidably disposed along a first direction; the first direction is perpendicular to the chair back to be tested. Figure 13 As shown, in the standard state, the top contact member 11 contacts the curved surface of the standard chair back 1'.

[0045] For details, please refer to Figure 4 The top contact member 11 includes a sliding shaft 111 and a sliding sleeve 112 that are nested together. The axial direction of the sliding shaft 111 and the sliding sleeve 112 extends along the first direction, so that the sliding shaft 111 can slide along the first direction. In this embodiment, the first direction is the vertical direction, and this direction will be used as an example for the following description.

[0046] Please refer to Figure 9The top of the sliding shaft 111 is provided with a contact point 1110 for contacting the curved surface of the chair back to be tested. When the contact point 11 is fixed on the curved surface of the chair back to be tested, the sliding shaft 111 slides along the first direction under the pressure of the curved surface of the chair back.

[0047] To reduce contact error, the contact point 1110 should not be too large. Therefore, the top of the sliding shaft 111 is provided with a tapered section that gradually narrows upwards, and the contact point 1110 is located at the top of the tapered section.

[0048] The sleeve 112 is located outside the sliding shaft 111 and slides in cooperation with the sliding shaft 111 along a first direction.

[0049] The deformation mechanism 12 is disposed at the end of the top contact member 11 and deforms as the top contact member 11 slides.

[0050] For details, please refer to Figure 4 The deformation mechanism 12 includes an abutment portion 121 and a compression spring 122.

[0051] The abutment part 121 is fixedly disposed in the middle of the sliding sleeve 112 and is used to fix the compression spring 122.

[0052] The compression spring 122 is disposed inside the sliding sleeve 112, and its two ends abut against the end of the sliding shaft 111 and the abutment portion 121, respectively. When the sliding shaft 111 slides, the compression spring 122 deforms. At the same time, throughout the process, the compression spring 122 provides a reverse force to the sliding shaft 111, making the sliding shaft tightly abut against the curved surface of the chair back to be tested.

[0053] The pressure measuring mechanism 13 is used to detect the pressure generated by the deformation of the deformation mechanism 12 and upload it to the controller (not shown in the figure).

[0054] The compression spring 11 slides and deforms due to the slippage of its sliding shaft 111. Simultaneously, the deformation of the compression spring 13 acts on the pressure measuring mechanism 13, which can be a force sensor located at the end of the compression spring. Therefore, the pressure generated by the deformation of the compression spring 11 can be detected. Since the pressure generated by the compression spring 11 is proportional to its compression amount, the detected pressure can represent the local height of the curved surface of the chair back in the vertical direction of the detection unit 10.

[0055] The adjustment unit 20 is used to adjust the plurality of detection units 10 to a standard state. As mentioned above, in the standard state, the top contact member 11 abuts against the curved surface of the standard chair back 1'. The reason for the initial state adjustment is to balance the pressure on each detection unit 10 and the chair back 1 to be tested as much as possible during the testing process.

[0056] If the standard state adjustment of the detection unit 10 is not performed, such as directly in Figure 3 In the indicated state, the chair back to be tested is placed on each testing unit 10 for testing. Even if the chair back to be tested is qualified, the compression spring 122 in the testing unit 10 experiences the greatest force at the lowest point of the curved surface of the chair back to be tested, and the compression spring 122 experiences the least force at the highest point of the curved surface of the chair back to be tested. At the same time, the pressure of the compression spring 122 will act in the opposite direction on the chair back 1 to be tested, resulting in uneven force distribution, and may even cause damage to the testing unit 10 or the chair back 1 to be tested.

[0057] Therefore, this embodiment requires the use of adjustment mechanism 20 to adjust the detection unit 10 to a standard state, so that in a natural state (without being squeezed by the chair back), the top position of all detection units 10 is aligned with the curved surface of the standard chair back (e.g., Figure 14 (As shown by the dashed line at the midpoint) Phase fit.

[0058] Please refer to Figure 3 and Figure 6 The adjustment unit 20 includes: a sealing cavity 21, an air filling / draining port 22, a sealing slide 23, and a second locking mechanism.

[0059] The sealing cavity 21 is a cavity that is completely sealed and includes at least one side fixing plate 211.

[0060] The inflation / deflation port 22 is connected to an external air pump for inflating or deflating the sealed cavity 21.

[0061] Several sealing slides 23 are provided, each corresponding to a detection unit 10. The sealing slides 23 are mounted on the fixing plate 211 for mounting the detection units. The sliding sleeve 112 slides and seals with the sealing slide 23 along a first direction, with the end of the sliding sleeve 112 extending into the sealing cavity 21. The sealing slide 23 is thickened relative to the fixing plate 211, thus increasing the contact surface between the sealing slide 23 and the sliding sleeve 112, thereby enhancing the sealing effect. In other embodiments, one of the sealing slides 23 and the sliding sleeve 112 may also be provided with an O-ring to further enhance the sealing effect.

[0062] At this point, the sliding sleeve 112 and the sealing slide 23 are interlocked. For example... Figure 13 As shown, the standard chair back 1' is first placed above all the detection units 10. Then, by filling the sealed cavity 21 with gas, the sliding sleeve 112 (i.e. the detection unit 10) can be pushed upward so that all the detection units 10 (specifically the contact points 1110 of the sliding shaft 111) abut against the curved surface of the standard chair back 1'.

[0063] The second locking mechanism 24 axially locks / unlocks the sealing slide 23 and the sliding sleeve 112. During testing, the detection unit 10 is subjected to downward pressure. To prevent relative sliding between the sliding sleeve 112 and the sealing slide 23, axial locking is required. Simultaneously, when adjusting to the standard state, the sealing slide 23 and the sliding sleeve 112 are axially unlocked.

[0064] It should also be noted that, because a compression spring 122 is provided between the sliding shaft 111 and the sliding sleeve 112 in the detection unit 10, oscillation will occur between the sliding shaft 111 and the sliding sleeve 112 when the standard chair back 1' is pressed down. Please refer to... Figure 4 To avoid this situation, a first locking mechanism 14 is provided between the sliding shaft 111 and the sliding sleeve 112. During the process of adjusting the plurality of detection units 10 to the standard state, the sliding shaft 111 and the sliding sleeve 112 are axially locked and unlocked after the adjustment is completed.

[0065] Specifically, during the adjustment process of the adjustment unit 20, the standard chair back 1' is placed on the plurality of detection units 10, the first locking mechanism 14 switches to the locked state, and the second locking mechanism 24 switches to the unlocked state. Air is injected into the sealed cavity 21 so that all the top contact parts 11 (specifically the contact points 1110 of the sliding shaft 111) abut against the curved surface of the standard chair back 1'. Then, the first locking mechanism 14 switches to the unlocked state, and the second locking mechanism 24 switches to the locked state, completing the adjustment.

[0066] like Figure 14 As shown, even if the standard chair back 1' is removed, the top of all the adjustment units 10 (i.e., contact points 1110) still fits the curved surface of the standard chair back 1' shown by the dotted line.

[0067] During testing, such as Figure 15 As shown, when the chair back 1 to be tested is placed on the adjustment unit 10 after the standard adjustment is completed, if there is a difference between the curved surface of the chair back 1 to be tested and the curved surface (dotted line) of the standard chair back, a height difference will be observed locally. Ultimately, this height difference is reflected in the different compression amounts of the compression springs 122 in each detection unit 10, that is, the pressure generated will be different.

[0068] It should be noted that if the chair back 1 to be tested has a large local concavity, the contact point 1110 of the corresponding detection unit 10 may be idle, meaning that the contact point 1110 will not be in contact with the curved surface of the chair back 1 to be tested. In this case, the pressure detected by the pressure measuring mechanism 13 inside the detection unit 10 cannot accurately reflect the height difference between the curved surface of the chair back 1 to be tested in that local area and other positions.

[0069] To avoid the above situation, such asFigures 13 to 15 As shown, this application also includes a pressing mechanism 30, which provides pressure to the chair back 1 to be tested at positions corresponding to at least three detection units 10 that are not on a straight line, so that the pressure measuring mechanisms 13 of the at least three detection units 10 detect a set reference pressure. Reference pressure The setting is set to be greater than 1.5 times the pressure detected by the pressure measuring mechanism 13 when the chair back 1 to be tested is not placed.

[0070] Since three points not on the same straight line can define a plane, applying pressure at the positions corresponding to at least three detection units 10 that are not on the same straight line can ensure the stability of the chair back 1 to be tested. In this embodiment, there are a total of 5×6=30 detection units 10, which are distributed in a rectangular array. Preferably, pressure is applied to the positions corresponding to the detection units 10 at the four corners of the rectangular array. Specifically, the pressing mechanism 30 is provided with four contact parts 31, which correspond to the detection units 10 at the four corners in the vertical direction.

[0071] It is worth mentioning that during the adjustment of the standard state, the back of the standard chair back (non-test curved surface) is in contact with the contact part 31, and all the top contact parts 11 are in contact with the curved surface of the standard chair back 1', so that the posture of the standard chair back during the adjustment process is consistent with that of the chair back to be tested during the testing process.

[0072] Finally, the controller processes the received pressure and determines whether the curvature of the chair back is acceptable. Several specific methods can be used: Method 1: Calculate all received pressures one by one With reference pressure absolute difference Where i represents the sequence number of the detection unit, and the largest absolute difference is taken. With the set first threshold In comparison, if the largest absolute difference Less than the first threshold If the surface curvature of the chair back is within acceptable limits, the chair back is deemed to be compliant; otherwise, the surface curvature is deemed to be non-compliant.

[0073] The judgment logic of this method is as follows: control the error of all detection positions on the curved surface of the chair back to be tested within a predetermined range. If there is a large error at any detection position on the curved surface of the chair back to be tested, the curved surface of the chair back to be tested is determined to be unqualified. The method considers the local error of the curved surface.

[0074] Method 2: Calculate all received pressures one by one With reference pressure absolute difference Where i represents the sequence number of the detection unit, and the summation is performed on all the absolute differences. The summation result is then compared with a set second threshold. In comparison, if the summation result is less than the second threshold... If the surface curvature of the chair back is within acceptable limits, the chair back is deemed to be compliant; otherwise, the surface curvature is deemed to be non-compliant.

[0075] The judgment logic of this method is as follows: the errors of all detection positions on the curved surface of the chair to be inspected are superimposed and compared for judgment, so as to control the total error within a certain range, considering the overall error of the curved surface.

[0076] Method 3: Calculate all received pressures one by one With reference pressure absolute difference , where i represents the sequence number of the detection unit; Take the largest absolute difference. With the set first threshold In comparison; simultaneously, summate all the absolute differences. The summation result is then compared with a set second threshold. In comparison; Only when the largest absolute difference Less than the first threshold And the summation result is less than the second threshold. If the curve of the chair back is deemed acceptable, it is considered acceptable; otherwise, it is considered unacceptable.

[0077] Method 3 combines the content of Method 1 and Method 2, taking into account both the local errors of the surface and the overall errors of the surface.

[0078] Example 2: First Locking Mechanism Based on Embodiment 1, Embodiment 2 proposes a first locking mechanism 14 that is easy to operate. For example... Figure 4 As shown, the first locking mechanism 14 includes a locking bar 141, a locking tongue 142, a locking hole 143, and a locking groove 144.

[0079] Please refer to Figure 4 and Figure 10 The locking rod 141 is fixed to the abutment portion 121 and extends toward the sliding shaft 111. The locking rod 141 is cylindrical in shape.

[0080] The locking tongue 142 is fixedly disposed on the top of the locking rod 141 and extends outward along the radial direction of the locking rod 141. The locking rod 141 and the locking tongue 142 together form an approximately inverted L-shaped structure.

[0081] Please refer to Figure 5 and Figure 9 The lock hole 143 is located at the end of the sliding shaft 111 and is used for the top of the locking rod 141 and the locking tongue 142 to be inserted.

[0082] The locking groove 144 is located at the bottom of the lock hole 143 and extends circumferentially from the part of the lock hole 143 corresponding to the bolt 142.

[0083] During the locking process, the locking rod 141 is inserted to the bottom of the lock hole 143, and the sliding shaft 111 is rotated to cause the locking tongue 142 to enter the locking groove 144, thus switching the first locking mechanism 14 to the following position. Figure 7 and Figure 8 The locking state shown completes the axial locking of the sliding shaft 111 and the sliding sleeve 112. During the unlocking process, the sliding shaft 111 is rotated in the opposite direction to disengage the locking tongue 142 from the locking groove 144 until it is fully inserted into the lock hole 143. The first locking mechanism 14 switches to the unlocked state, and the sliding shaft 111 and the sliding sleeve 112 slide freely axially.

[0084] It is worth mentioning that the sliding shaft 111 is close to the cylinder as a whole. In order to facilitate rotation, the sliding shaft 111 is symmetrically provided with gripping surfaces 1112 on both sides of the conical section. The gripping surfaces 1112 are vertically arranged planes, which are convenient for fingers to grip.

[0085] Because the first locking mechanism 14 in this embodiment locks / unlocks by horizontal rotation, uncontrollable stress may occur between the sliding shaft 111 and the compression spring 122. To avoid this stress, please refer to... Figure 5 and Figure 11 The sliding shaft 111 is provided with a first washer 123 at its end. The first washer 123 is rotatably connected to the sliding shaft 111, and the compression spring 122 is fixedly connected to the first washer 123.

[0086] It is worth mentioning that the end of the sliding shaft 111 is recessed inward to form a step, and the first washer 123 is sleeved on the outside of the step. An annular limiting groove 1111 is provided on the outer periphery of the step, and an annular limiting rib 1231 is provided inside the first washer 123 to cooperate with it. When the first washer 123 is installed at the end of the sliding shaft 111, the annular limiting rib 1231 is engaged in the annular limiting groove 1111, preventing axial slippage and allowing both to rotate relative to each other, thereby eliminating the stress on the compression spring 122.

[0087] To facilitate the installation of the first washer 123, the first washer 123 is made of an elastic material, and a slit is provided on the periphery of the first washer 123 to accommodate minor deformation during the installation process. In addition, to accommodate the passage of the interference lock rod 141 and the lock tongue 142, the first washer 123 has a hollow area.

[0088] Similarly, a second washer 124 can also be provided between the compression spring 122 and the pressure measuring mechanism 13. The second washer 124 is fixedly connected to the other end of the compression spring 122. The second washer 124 is a hollow annular washer, which can be directly stacked on the pressure measuring mechanism 13.

[0089] On the other hand, to avoid rotating the sliding sleeve 112 simultaneously when rotating the sliding shaft, please refer to... Figure 10 and Figure 12 The outer wall of the sliding sleeve 112 is provided with a first limiting plane 1121, and the inner wall of the sealing slide 23 is provided with a corresponding second limiting plane 231. The first limiting plane 1121 and the second limiting plane 231 are in contact to ensure sealing.

[0090] To minimize the weight of the detection unit, the lower part of the sliding sleeve 112 is hollow, specifically, as shown in... Figure 10 As shown, the area below the contact portion 121 is a hollow region 1122.

[0091] Similarly, to accommodate the passage of the interfering locking rod 141 and locking tongue 142, the pressure measuring mechanism 13 includes a ring-shaped hollow force sensor. The ring-shaped hollow force sensor is disposed between the abutment portion 121 and the compression spring 122, and the main body of the locking rod 141 passes through the hollow area of ​​the ring-shaped hollow force sensor.

[0092] Example 3: Second Locking Mechanism Based on Embodiment 1 or Embodiment 2, Embodiment 3 further proposes a convenient-to-operate second locking mechanism 24. For details, please refer to... Figure 6 and Figure 12 The second locking structure 24 includes: a slide 241, a locking block 242, and a locking bolt 243.

[0093] The groove 241 is formed on one side of the sealing slide 23 and extends radially toward the slide sleeve 112.

[0094] The locking block 242 is disposed in the slide groove 241 and slides in cooperation with the slide groove 241.

[0095] The locking bolt 243 is threaded into the sealing slide 23. The end of the locking bolt 243 extends toward the locking block 242. As the locking bolt 243 rotates, it drives the locking block 242 to move toward the sliding sleeve 112. When the locking block 242 abuts against the surface of the sliding sleeve 112, the sealing slide 23 and the sliding sleeve 112 are axially locked. Conversely, if the locking bolt 243 is rotated in the opposite direction, the locking block 242 disengages from the sliding sleeve 112, thus unlocking the device.

[0096] It should be understood that the various forms of processes shown above can be used to rearrange, add, or delete steps. For example, the steps described in this application can be executed in parallel, sequentially, or in different orders, as long as the desired result of the technical solution of this application can be achieved, and this is not limited herein.

[0097] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly specified.

[0098] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A system for detecting the surface of an ergonomic chair back, comprising: The device comprises a plurality of detection units, an adjusting unit for adjusting the plurality of detection units to a standard state, and a controller; The detection unit comprises: a top contact for contacting the curved surface of the chair back to be detected, the top contact being arranged to slide in a first direction; the first direction being perpendicular to the chair back to be detected; in the standard state, the top contact contacts the curved surface of the standard chair back; a deformation mechanism arranged at the end of the top contact and deformed with the sliding of the top contact; a pressure measuring mechanism for detecting the pressure generated by the deformation of the deformation mechanism and uploading to the controller; The controller processes the received pressure and determines whether the curved surface of the chair back to be detected is qualified.

2. The ergonomic chair back surface detection system of claim 1, wherein, It also comprises a downward pressing mechanism for providing a pressing force to the chair back to be detected towards the detection units at the positions of at least three detection units not on a straight line, so that the at least three detection units detect the reference pressure.

3. A system for detecting the surface of an ergonomic chair back according to claim 2, wherein The controller processes the received pressure and determines whether the curved surface of the chair back to be detected is qualified by the following method: Calculate the absolute difference between all received pressures and the reference pressure one by one, compare the maximum absolute difference with the set first threshold value, if the maximum absolute difference is less than the first threshold value, determine that the curved surface of the chair back to be detected is qualified, otherwise determine that the curved surface of the chair back to be detected is unqualified.

4. The ergonomic chair back surface detection system of claim 1, wherein, The top contact comprises: a sliding shaft, the top of the sliding shaft is provided with a contact point for contacting the curved surface of the chair back to be detected; a sliding sleeve, the sliding sleeve is sleeved on the outside of the sliding shaft and is in sliding fit with the sliding shaft in the first direction.

5. A system for detecting the surface of an ergonomic chair back according to claim 4, characterized in that The deformation mechanism comprises: an abutting portion fixedly arranged at the middle of the sliding sleeve; a compression spring arranged in the sliding sleeve, and the two ends of the compression spring are respectively in abutment with the end of the sliding shaft and the abutting portion; when the sliding shaft slides, the compression spring deforms.

6. A system for detecting the surface of an ergonomic chair back according to claim 5, wherein A first locking mechanism is arranged between the sliding shaft and the sliding sleeve, and the sliding shaft and the sliding sleeve are axially locked / unlocked during the adjustment of the plurality of detection units to the standard state; the first locking mechanism comprises: a lock rod fixedly arranged with the abutting portion and extending towards the side of the sliding shaft; a lock tongue fixedly arranged at the top of the lock rod and extending outwardly along the radial direction of the lock rod; a lock hole opened at the end of the sliding shaft for the insertion of the top of the lock rod and the lock tongue; a locking groove arranged at the bottom of the lock hole and extending along the circumferential direction from the part of the lock hole corresponding to the lock tongue; The lock rod is inserted into the bottom of the lock hole, the sliding shaft is rotated to make the lock tongue enter the locking groove, the first locking mechanism is switched to the locked state, and the axial locking of the sliding shaft and the sliding sleeve is completed; the sliding shaft is reversely rotated to make the lock tongue disengage from the locking groove until it enters the lock hole, the first locking mechanism is switched to the unlocked state, and the sliding shaft and the sliding sleeve are axially freely slidable.

7. A system for detecting the surface of an ergonomic chair back according to claim 6, characterized in that The end of the sliding shaft is provided with a first gasket, the first gasket is rotationally connected with the sliding shaft, and the compression spring is fixedly connected with the first gasket.

8. The ergonomic chair back surface detection system of claim 6, wherein, The pressure measuring mechanism comprises a ring-shaped hollow force sensor arranged between the abutting portion and the compression spring, and the main body of the lock rod passes through the hollow area of the ring-shaped hollow force sensor.

9. The ergonomic chair back surface detection system of claim 6, wherein, The adjusting unit comprises: A sealed cavity, comprising at least one fixed plate; An inflation / deflation port for inflating / deflating the sealed cavity; A sealed sliding channel provided on the fixed plate for mounting the detection unit; the sliding sleeve is slidingly arranged with the sealed sliding channel in a first direction and sealingly cooperates with the sealed sliding channel, and the end of the sliding sleeve extends into the sealed cavity; A second locking mechanism for axially locking / unlocking the sealed sliding channel and the sliding sleeve; During the adjustment of the adjustment unit, the standard chair back is placed on the detection units, the first locking mechanism is switched to the locked state, the second locking mechanism is switched to the unlocked state, the sealed cavity is inflated to make all the top contact pieces contact the curved surface of the standard chair back; then, the first locking mechanism is switched to the unlocked state, and the second locking mechanism is switched to the locked state, and the adjustment is completed.

10. A system for detecting the surface of an ergonomic chair back according to claim 9, characterized in that, The second locking mechanism comprises: A sliding groove provided on one side of the sealed sliding channel; A locking block provided in the sliding groove and slidingly cooperating with the sliding groove; A locking bolt threadedly cooperating with the sealed sliding channel, the end of the locking bolt extending towards the locking block, and the locking block moving towards the sliding sleeve with the rotation of the locking bolt, and the axial locking of the sealed sliding channel and the sliding sleeve being completed when the locking block abuts against the surface of the sliding sleeve.

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