Siphon sheet mounting device

Abstract

The utility model discloses a siphon piece installation device which comprises a base, a control mechanism, a driving mechanism, a supporting mechanism and a transmission mechanism, the control mechanism, the driving mechanism and the supporting mechanism are installed on the base, the transmission mechanism is connected to the supporting mechanism, and the supporting mechanism comprises a ceramic tube installation frame and four sets of symmetrically-arranged siphon piece positioning plates. The ceramic tube mounting rack is mounted on the base and connected with the transmission mechanism, and the siphon sheet positioning plate is connected with the transmission mechanism; the control mechanism controls the driving mechanism to drive the transmission mechanism to act, and then the four sets of siphon piece positioning plates are driven to do inner rotation action. The control mechanism controls the driving mechanism to drive the transmission mechanism to act, then the four sets of siphon piece positioning plates are driven to do inner rotation action, automatic installation of the ceramic pipe and the siphon pieces is achieved, the working efficiency is improved, and meanwhile pollution caused by contact of workers is reduced.

Description

Technical Field

[0001] The utility model relates to a ceramic tube and a siphon piece installation tool, in particular to a siphon piece installation device. Background Art

[0002] The main internal structure of the sodium salt battery includes siphon plates, ceramic tubes, current collector components and sealing pins. Whether their assembly is qualified or not plays a key role in battery performance.

[0003] The battery assembly sequence is to first install the siphon piece on the ceramic tube. Once the assembly is complete, insert it into the battery casing. The cleanliness of the ceramic tube and the proper installation of the siphon piece during assembly are crucial to the final performance of the battery. Dirt and bumps on the ceramic tube, as well as misaligned siphon pieces, can lead to incomplete performance or even failure.

[0004] Currently, the installation methods of siphon plates are mainly manual installation and manual pressing tooling.

[0005] Manual installation causes operators to frequently touch the siphon plate and ceramic tube during installation, and frequently adjust the angle during installation. Frequent touching can cause the siphon plate and ceramic tube to become contaminated with impurities, and frequent angle adjustments increase the risk of collisions, causing cracks in the workpiece and ultimately affecting electrical performance. Manual installation also leads to different errors due to different operator habits, affecting the consistency of assembly and the final electrical performance.

[0006] Although manual pressing tooling reduces the probability of contamination and collision of the workpiece, it requires too many steps to be performed simultaneously, which can easily lead to operational errors and thus installation errors. The different spring strengths of different tooling can also lead to assembly errors.

[0007] With the improvement of automation level and higher requirements for performance, manual installation and manual pressing tooling can no longer meet the assembly requirements. Therefore, it is necessary to design an assembly tool to improve the assembly consistency of the siphon plate and the ceramic tube, simplify the operation, and improve efficiency. Utility Model Content

[0008] In view of the deficiencies in the prior art, the utility model provides a siphon sheet installation device, which realizes automatic installation of ceramic tubes and siphon sheets through a control mechanism, a drive mechanism and a transmission mechanism, thereby improving efficiency.

[0009] To achieve the above-mentioned purpose, the utility model provides a siphon plate installation device, including a base and a control mechanism, a driving mechanism, a supporting mechanism installed on the base, and a transmission mechanism connected to the supporting mechanism, wherein: the supporting mechanism includes a ceramic tube mounting frame and four groups of symmetrically arranged siphon plate positioning plates, the ceramic tube mounting frame is installed on the base and connected to the transmission mechanism, and the siphon plate positioning plate is connected to the transmission mechanism; the control mechanism controls the driving mechanism to drive the transmission mechanism to move, thereby driving the four groups of siphon plate positioning plates to perform an inward rotation movement.

[0010] The transmission mechanism includes a mobile platform and four groups of linkage structures, one end of each group of the linkage structures is hinged to the mobile platform, and the other end is hinged to the ceramic tube mounting frame, and each group of the linkage structures is correspondingly and detachably connected to a group of the siphon plate positioning plates; the mobile platform is connected to the driving mechanism, and moves up and down under the drive of the driving mechanism, thereby driving the four groups of linkage structures to perform an inward rotation movement.

[0011] Each group of the linkage structure includes a rotating shaft, a crank and a connecting plate, wherein: the two ends of the rotating shaft are detachably mounted on the ceramic tube mounting frame; one end of the crank is hinged to the rotating shaft, and the other end is hinged to the connecting plate, and a corresponding group of siphon plate positioning plates are mounted on the crank; the other end of the connecting plate is hinged to the mobile platform.

[0012] Each group of the siphon plate positioning plates is provided with at least one strip hole, and the siphon plate positioning plates are mounted on the corresponding cranks through the strip holes and a plurality of first fixing members corresponding to the strip holes.

[0013] Two ends of each rotating shaft are connected to a fixing plate, and the fixing plates are located on both sides of the corresponding crank. Each fixing plate is detachably fixed to the ceramic tube mounting frame through a plurality of second fixing members.

[0014] The connecting plate is an H-shaped structure, one end of the H-shaped structure is hinged to the corresponding crank through a first pin shaft, and the other end is hinged to the moving platform through a second pin shaft.

[0015] The driving mechanism includes a connected lift and a pneumatic cylinder, and the control mechanism includes a connected pneumatic valve and a pneumatic switch. The pneumatic valve is connected to the pneumatic cylinder. The lift is connected to the mobile platform and moves up and down under the drive of the pneumatic cylinder. The pneumatic cylinder, the pneumatic valve, and the pneumatic switch are all mounted on the base.

[0016] The ceramic tube mounting rack includes a ceramic tube mounting plate and a plurality of pillars, wherein one end of the plurality of pillars is vertically mounted on the base, and the other end is connected to the ceramic tube mounting plate.

[0017] The number of the pillars is four, the mobile platform is a cross-shaped structure, and the four pillars are respectively installed on the right-angle center lines of the cross-shaped structure.

[0018] The ceramic tube mounting plate is provided with positioning holes corresponding to the ceramic tubes; and a buffer rubber is attached to the bottom of the positioning holes.

[0019] From the above scheme, it can be seen that the advantages of the present invention are:

[0020] The control mechanism controls the driving mechanism to drive the transmission mechanism, which in turn drives the four sets of siphon plate positioning plates to perform an inward rotation, thereby realizing the automatic installation of the ceramic tube and the siphon plate, thereby improving work efficiency and reducing pollution caused by contact of workers;

[0021] The transmission mechanism is an articulated system consisting of a rotating shaft, a connecting plate, and a mobile platform, and has the advantages of being simple, reliable, efficient, flexible, and low-cost.

[0022] The driving mechanism adopts jacking and cylinder, and the control mechanism adopts pneumatic valve and pneumatic switch, which can be operated with one hand and has a simple structure;

[0023] A strip hole is opened on each set of siphon piece positioning plates. By adjusting the fixed position in the strip hole, siphon pieces of various diameters or lengths can be adapted. This has strong versatility and significantly reduces costs while improving convenience.

[0024] The ceramic tube positioning hole is designed to install and position the ceramic tube to improve accuracy. A buffer rubber is attached to the bottom to avoid friction and collision caused by contact between the ceramic tube and the ceramic tube mounting plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is an overall structural diagram of a siphon sheet installation device provided by an embodiment of the present utility model;

[0026] Figure 2 Exploded view of a siphon sheet installation device provided by one embodiment of the present invention (1);

[0027] Figure 3 Exploded view of the siphon sheet installation device provided in one embodiment of the present invention (II);

[0028] Figure 4 This is a top view of a siphon sheet installation device provided by one embodiment of the present utility model;

[0029] Figure 5 This is a schematic diagram of the assembly of a siphon sheet installation device and a siphon sheet provided by an embodiment of the present utility model;

[0030] Figure 6This is a schematic diagram of the assembly of a siphon plate installation device, a siphon plate, and a ceramic tube provided by an embodiment of the present invention;

[0031] Wherein, the reference numerals:

[0032] 1- Siphon sheet installation device;

[0033] 10- base;

[0034] 11- Control mechanism;

[0035] 110-pneumatic valve;

[0036] 111-pneumatic switch;

[0037] 12- driving mechanism;

[0038] 120-jacking;

[0039] 121-cylinder;

[0040] 13- transmission mechanism;

[0041] 130-Mobile platform;

[0042] 131- linkage structure;

[0043] 1310-rotation axis;

[0044] 1311-crank;

[0045] 1311a-one end;

[0046] 1311b-the other end;

[0047] 1312-connecting plate;

[0048] 1313-fixed plate;

[0049] 14-support mechanism;

[0050] 140-Ceramic tube mounting bracket;

[0051] 1400-Ceramic tube mounting plate;

[0052] 1400a- positioning hole;

[0053] 1401-Pillar;

[0054] 141-siphon piece positioning plate;

[0055] 1410-bar hole;

[0056] 1411-groove;

[0057] 150-first pin;

[0058] 151-second pin;

[0059] 16-first fixing member;

[0060] 17- second fixing member;

[0061] 18- cushioning rubber;

[0062] L-right angle center line;

[0063] 2-Ceramic tube;

[0064] 3- Siphon piece. DETAILED DESCRIPTION

[0065] The technical solution of the present invention is described in detail below with reference to the accompanying drawings and specific embodiments to further understand the purpose, solution and effect of the present invention, but it is not intended to limit the scope of protection of the claims attached to the present invention.

[0066] References in the specification to "an embodiment," "another embodiment," "this embodiment," etc., indicate that the described embodiment may include specific features, structures, or characteristics, but not every embodiment must include these specific features, structures, or characteristics. Furthermore, such references do not necessarily refer to the same embodiment. Furthermore, when specific features, structures, or characteristics are described in conjunction with an embodiment, whether or not explicitly described, it is understood that incorporating such features, structures, or characteristics into other embodiments is within the knowledge of those skilled in the art.

[0067] Certain words are used in the specification and subsequent claims to refer to specific components or parts. It should be understood by those skilled in the art that technical users or manufacturers may refer to the same component or part with different nouns or terms. This specification and claims do not distinguish components or parts based on differences in name, but rather on differences in the functions of the components or parts. The words "include" and "comprising" mentioned throughout the specification and claims are open-ended terms and should be interpreted as "including but not limited to". In addition, the word "connect" herein includes any direct and indirect electrical connection means. Indirect electrical connection means include connection through other devices.

[0068] It should be noted that, in the description of the present invention, the terms "transverse", "longitudinal", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and "approximately", or "approximately", "substantially", "left and right" and the like to indicate directions or positional relationships or parameters are all based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description content, and do not indicate or imply that the device or element referred to must have a specific direction, specific size or be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0069] This utility model is a specialized tool for assembling the siphon sheet and ceramic tube within a sodium salt battery. It is used during the battery assembly process until the siphon sheet and ceramic tube assembly is installed into the battery casing. It primarily positions and installs the siphon sheet on the ceramic tube. Its primary function is to improve assembly consistency, prevent siphon sheet misalignment and electrical performance deficiencies caused by assembly errors, and reduce contamination and bumps during installation.

[0070] The utility model firstly optimizes the shortcomings of manual assembly that easily causes pollution and bumps to the siphon plate and ceramic tube, reduces the contact time of parts in the operator's hands, and optimizes the problem of large errors in manual assembly. The use of fixed tooling for installation increases process uniformity, reduces assembly errors, and makes possible problems traceable and controllable.

[0071] Secondly, the manual press tooling assembly, which required simultaneous fixation of the ceramic tube and siphon plate and manual force, has been improved. After inserting the parts, the pneumatic switch can be operated with one hand. This eliminates the inconsistent assembly caused by the press spring and varying operator strength. The tooling uses a unified air source to provide power, ensuring consistent retraction distance and force, reducing assembly errors.

[0072] like Figures 1 to 4 As shown, Figure 1 This is an overall structural diagram of a siphon sheet installation device 1 provided in one embodiment of the present utility model; Figure 2 is an exploded view of the siphon sheet mounting device 1; Figure 3 is another exploded view of the siphon sheet mounting device 1; Figure 4 It is a top view of a siphon sheet installation device 1 provided in one embodiment of the present invention.

[0073] In this embodiment, the siphon plate installation device 1 includes a base 10, a control mechanism 11, a driving mechanism 12, a transmission mechanism 13 and a support mechanism 14, wherein the control mechanism 11, the driving mechanism 12 and the support mechanism 14 are installed on the base 10, and the transmission mechanism 13 is connected to the support mechanism 14.

[0074] Specifically, the support mechanism 14 includes a ceramic tube mounting frame 140 and four symmetrically arranged sets of siphon plate positioning plates 141. Each set of siphon plate positioning plates 141 has a groove 1411 corresponding to the position of the siphon plate. The ceramic tube mounting frame 140 is mounted on the base 10 and connected to the transmission mechanism 13. The siphon plate positioning plates 141 are connected to the transmission mechanism 13. The control mechanism 11 controls the drive mechanism 12 to drive the transmission mechanism 13, thereby driving the four sets of siphon plate positioning plates 141 to perform an inward rotation. In this way, the automatic installation of the ceramic tube and siphon plate is achieved, while improving work efficiency and reducing contamination caused by contact by staff.

[0075] In this embodiment, the transmission mechanism 13 includes a mobile platform 130 and four sets of linkage structures 131. Each set of linkage structures 131 is hingedly connected to the mobile platform 130 at one end and to the ceramic tube mounting frame 140 at the other end. Each set of linkage structures 131 is detachably connected to a corresponding set of siphon plate positioning plates 141. The mobile platform 130 is connected to the drive mechanism 12. Driven by the drive mechanism 12, the mobile platform 130 moves up and down, thereby driving the four sets of linkage structures 131 to perform inward rotation. The four sets of linkage structures 131 are respectively connected to four sets of siphon plate positioning plates 141, thereby causing the four sets of siphon plate positioning plates 141 to also perform inward rotation.

[0076] Each group of linkage structures 131 includes a rotating shaft 1310, a crank 1311 and a connecting plate 1312, wherein: both ends of the rotating shaft 1310 can be detachably mounted on the ceramic tube mounting frame 140; one end 1311a of the crank 1311 is hinged to the rotating shaft 1310, and the other end 1311b is hinged to the connecting plate 1312, and each crank 1311 is correspondingly installed with a group of siphon plate positioning plates 141; the other end of the connecting plate 1312 is hinged to the moving platform 130.

[0077] Specifically, as the drive mechanism 12 drives the mobile platform 130 up and down, the connecting plate 1312, hinged to the mobile platform 130, also moves up and down, driving the other end 1311b of the crank 1311 up and down. This, in turn, causes the one end 1311a of the crank 1311 to rotate about the rotation axis 1310, achieving an inward rotation of the linkage structure 131, driving the corresponding siphon plate positioning plate 141 to also perform an inward rotation. It should be noted that the connecting plate 1312 may be perpendicular or non-perpendicular to the mobile platform 130 (i.e., at an angle). When the mobile platform 130 moves up and down, the connecting plate 1312 moves vertically or diagonally up and down.

[0078] Furthermore, to improve the stability and continuity of the transmission mechanism 13, the connecting plate 1312 is designed as an H-shaped structure, one end of which is hinged to the corresponding crank 1311 via a first pin 150, and the other end is hinged to the movable platform 130 via a second pin 151. The first pin 150 and the second pin 151 may be the same or different.

[0079] In this embodiment, each set of siphon plate positioning plates 141 defines at least one strip-shaped hole 1410. Each set of siphon plate positioning plates 141 is mounted on a corresponding crank 1311 via the strip-shaped holes 1410 and a plurality of first fixing members 16 corresponding to the strip-shaped holes 1410. In this embodiment, each set of siphon plate positioning plates 141 has two strip-shaped holes 1410, and each strip-shaped hole 1410 is secured by two sets of first fixing members 16, but this is not limiting.

[0080] Specifically, by adjusting the fixed position of the first fixing member 16 on the strip hole 1410, the horizontal displacement of the siphon sheet positioning plate 141 can be adjusted, thereby adjusting the space between the four groups of siphon sheet positioning plates 141 to accommodate siphon sheets of various diameters or lengths, significantly reducing development costs and storage pressure. The first fixing member 16 is, for example, a bolt and a nut. Preferably, the first fixing member 16 uses a nylon locking nut or a butterfly bolt to ensure that it is firmly fixed after adjustment to avoid vibration and loosening. Through the adjustable structure of the strip hole, the siphon sheet installation device 1 realizes the core advantages of multi-purpose installation, rapid changeover, and cost control, and is particularly suitable for multi-variety, small-batch production scenarios.

[0081] In this embodiment, each rotating shaft 1310 is connected to a fixing plate 1313 at each end. The fixing plates 1313 are located on either side of the corresponding crank 1311. Each fixing plate 1313 is removably fixed to the ceramic tube mounting frame 140 via a plurality of second fixing members 17, such as screws. The provision of the fixing plates 1313 can improve the stability of the rotating shaft 1310 while limiting the horizontal movement of the corresponding crank 1311.

[0082] Specifically, both ends of the rotating shaft 1310 are mounted on the ceramic tube mounting frame 140 through fixed plates 1313, and one end 1311a of the crank 1311 is restricted between the two fixed plates 1313. The fixed plates 1313 have a certain thickness. In this way, when the other end 1311b of the crank 1311 moves up and down, one end 1311a of the crank 1311 can only rotate along the rotating shaft 1310 without causing left and right shaking (moving along the axial direction of the rotating shaft 1310).

[0083] In this embodiment, the ceramic tube mounting frame 140 includes a ceramic tube mounting plate 1400 and a plurality of pillars 1401 , wherein one end of the plurality of pillars 1401 is vertically mounted on the base 10 , and the other end is connected to the ceramic tube mounting plate 1400 .

[0084] In this embodiment, there are four pillars 1401, and the mobile platform 130 is a cross-shaped structure. The four pillars 1401 are respectively installed on the right-angle center line L of the cross-shaped structure. Specifically, the cross-shaped mobile platform 130 corresponds to four sets of siphon plate positioning plates 141, which is stable, beautiful, and lightweight.

[0085] In this embodiment, ceramic tube mounting plate 1400 is provided with positioning holes 1400a corresponding to the ceramic tubes. A cushioning rubber 18 is attached to the bottom of positioning holes 1400a to prevent friction and collisions between the bottom of the ceramic tube and the siphon plate mounting device 1. In other embodiments, cushioning rubber 18 is attached to the bottom of the space enclosed by ceramic tube mounting plate 1400 and the four sets of siphon plate positioning plates 141.

[0086] In this embodiment, the drive mechanism 12 includes a lift 120 and a cylinder 121. The control mechanism 11 includes a connected pneumatic valve 110 and a pneumatic switch 111. The pneumatic switch 111 controls the opening and closing of the pneumatic valve 110. Preferably, the pneumatic switch 111 is a lever switch. The pneumatic valve 110 is connected to the cylinder 121 via an air pipe (not shown). The cylinder 121 is connected to the lift 120, and the lift 120 is connected to the mobile platform 130. The cylinder 121, the pneumatic valve 110, and the pneumatic switch 111 are all mounted on the base 10. During operation, the pneumatic switch 111 is activated by one hand, the pneumatic valve 110 opens, and the cylinder 121 drives the lift 120 upward. When the pneumatic switch 111 is closed, the pneumatic valve 110 closes, and the cylinder 121 drives the lift 120 downward.

[0087] like Figure 5 and Figure 6 As shown, the specific operation process of the siphon sheet installation device 1 is as follows:

[0088] First, place the four siphon sheets 3 in the grooves 1411 of the four groups of siphon sheet positioning plates 141 respectively, then place the ceramic tube 2 in the positioning hole 1400a, start the pneumatic switch 111, and the mobile platform 130 moves upward under the action of the jacking 120, driving the four groups of linkage structures 131 and the four groups of siphon sheet positioning plates 141 to perform an inward rotation in turn, pushing the four siphon sheets 3 inward tightly on the ceramic tube 2, completing the automatic installation of the ceramic tube 2 and the siphon sheet 3. After the installation is complete, turn off the pneumatic switch 111, and the mobile platform 130 moves downward under the action of the jacking 120, driving the four groups of linkage structures 131 and the four groups of siphon sheet positioning plates 141 to reset in turn.

[0089] During the installation process, the siphon plate 3 fits tightly against the support mechanism 14, and the lower ceramic tube 2 is placed in a position designed to reserve space for the siphon plate 3 to move (i.e., the space formed by the four sets of siphon plate positioning plates 141 and the ceramic tube mounting plate 1400), thereby preventing the siphon plate 3 from deforming during the fitting process. A buffer rubber 18 is affixed to the positioning hole 1400a of the ceramic tube 2 to avoid friction and collisions caused by contact between the bottom of the ceramic tube 2 and the siphon plate mounting device 1. The operating switch is a pneumatic valve 110 controlled by a lever switch, which enables one-handed operation. At the same time, the entire siphon plate mounting device 1 has a simple mechanical structure, which is easy to maintain and adjust, and reduces downtime caused by failures.

[0090] The embodiments of the present invention are described above in conjunction with the accompanying drawings, but the present invention is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of the present invention, ordinary technicians in this field can also make many forms without departing from the scope of protection of the purpose of the present invention and the claims, all of which fall within the scope of protection of the present invention.

Claims

1. A siphon sheet installation device, characterized in that: The invention comprises a base and a control mechanism, a driving mechanism, a supporting mechanism installed on the base, and a transmission mechanism connected to the supporting mechanism, wherein: The support mechanism includes a ceramic tube mounting frame and four sets of symmetrically arranged siphon plate positioning plates. The ceramic tube mounting frame is mounted on the base and connected to the transmission mechanism. The siphon plate positioning plates are connected to the transmission mechanism. The control mechanism controls the driving mechanism to drive the transmission mechanism to move, thereby driving the four groups of siphon plate positioning plates to perform an inward rotation movement.

2. The siphon sheet installation device according to claim 1, characterized in that: The transmission mechanism includes a mobile platform and four groups of linkage structures, one end of each group of linkage structures is hinged to the mobile platform, and the other end is hinged to the ceramic tube mounting frame, and each group of linkage structures is detachably connected to a group of siphon plate positioning plates; The mobile platform is connected to the driving mechanism and moves up and down under the drive of the driving mechanism, thereby driving the four groups of linkage structures to perform an inner rotation movement.

3. The siphon sheet installation device according to claim 2, characterized in that: Each group of linkage structures includes a rotating shaft, a crank and a connecting plate, wherein: Both ends of the rotating shaft are detachably mounted on the ceramic tube mounting frame; One end of the crank is hinged to the rotating shaft, and the other end is hinged to the connecting plate, and a corresponding set of siphon plate positioning plates are installed on the crank; The other end of the connecting plate is hinged to the moving platform.

4. The siphon sheet installation device according to claim 3, characterized in that: Each group of the siphon plate positioning plates is provided with at least one strip hole, and the siphon plate positioning plates are mounted on the corresponding cranks through the strip holes and a plurality of first fixing members corresponding to the strip holes.

5. The siphon sheet installation device according to claim 3, characterized in that: Two ends of each rotating shaft are connected to a fixing plate, and the fixing plates are located on both sides of the corresponding crank. Each fixing plate is detachably fixed to the ceramic tube mounting frame through a plurality of second fixing members.

6. The siphon sheet installation device according to claim 3, characterized in that: The connecting plate is an H-shaped structure, one end of the H-shaped structure is hinged to the corresponding crank through a first pin shaft, and the other end is hinged to the moving platform through a second pin shaft.

7. The siphon sheet installation device according to any one of claims 2 to 6, characterized in that: The driving mechanism includes a connected jack and a cylinder, and the control mechanism includes a connected pneumatic valve and a pneumatic switch, wherein the pneumatic valve is connected to the cylinder; The jack is connected to the mobile platform, and the jack moves up and down under the drive of the cylinder; The cylinder, the pneumatic valve and the pneumatic switch are all installed on the base.

8. The siphon sheet installation device according to any one of claims 2 to 6, characterized in that: The ceramic tube mounting frame includes a ceramic tube mounting plate and a plurality of pillars, wherein: One end of the plurality of pillars is vertically mounted on the base, and the other end is connected to the ceramic tube mounting plate.

9. The siphon sheet installation device according to claim 8, characterized in that: The number of the pillars is four, the mobile platform is a cross-shaped structure, and the four pillars are respectively installed on the right-angle center lines of the cross-shaped structure.

10. The siphon sheet installation device according to claim 8, characterized in that: The ceramic tube mounting plate is provided with positioning holes corresponding to the ceramic tubes; and a buffer rubber is attached to the bottom of the positioning holes.

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