Flexible forming die for wind power blade

Abstract

The utility model discloses a flexible forming die for a wind power blade. The flexible forming die comprises an upper forming die surface structure, a lower forming die surface structure and a turnover mechanism, each of the upper forming die surface structure and the lower forming die surface structure comprises an integral supporting mechanism, edge supporting mechanisms, a flexible die surface and a jacking mechanism, the multiple edge supporting mechanisms are arrayed on the two sides of the integral supporting mechanism respectively, the multiple jacking mechanisms are arrayed in the middle of the integral supporting mechanism, and the flexible die surface is connected with all the edge supporting mechanisms and the jacking mechanisms; the edge supporting mechanism comprises a transverse guide rail and a supporting module; a transverse guide rail is mounted on each transverse platform of the integral supporting mechanism; a supporting module is mounted at each of the two ends of each transverse guide rail; the supporting module comprises a lower frame body, an upper frame body, an edge push rod, a hub motor, a roller and an edge sliding block. The die is suitable for forming blades of different models, and the universality of the die is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of wind power blade forming equipment, and particularly relates to a flexible forming die for wind power blades. Background Art

[0002] Wind power blades are important components of wind turbines and key components for realizing wind energy conversion. The quality of their design and manufacture directly affects the energy conversion efficiency, and the quality of the blades depends on the quality of the die. High-precision die design and manufacture are important guarantees for the blade shape, and play a decisive role in the forming quality, production efficiency and performance of the product. At present, wind power blades are mainly manufactured by using female die forms. Most traditional blade female dies are designed for specific types of blades, and have deficiencies such as high specificity, low utilization rate of male dies, and non-adjustable mold surfaces, resulting in poor universality of the die and relatively high production costs. Content of the Utility Model

[0003] Aiming at the deficiencies of the prior art, the technical problem to be solved by the utility model is to propose a flexible forming die for wind power blades.

[0004] The utility model adopts the following technical solutions to solve the above technical problems:

[0005] A flexible forming die for wind power blades, characterized by comprising an upper forming die surface structure, a lower forming die surface structure and a flipping mechanism; both the upper forming die surface structure and the lower forming die surface structure include an overall support mechanism, an edge support mechanism, a flexible die surface and a jacking mechanism. A plurality of edge support mechanisms are respectively arrayed on both sides of the overall support mechanism, a plurality of jacking mechanisms are arrayed in the middle of the overall support mechanism, and the flexible die surface is connected to all the edge support mechanisms and the jacking mechanisms;

[0006] The edge support mechanism includes a transverse guide rail and a support module; a transverse guide rail is installed on each transverse platform of the overall support mechanism, and a support module is installed at each end of the transverse guide rail; the support module includes a lower frame body, an upper frame body, an edge push rod, a hub motor, a roller and an edge slider. The lower frame body is slidably connected to the transverse guide rail through the edge slider, a plurality of rollers cooperating with the transverse guide rail are installed at the bottom of the lower frame body, and each roller is connected to a hub motor; a magnetic attraction strip is provided at the top of the upper frame body, and the lower part is slidably connected to the lower frame body.

[0007] Furthermore, the jacking mechanism includes a lateral slider, a longitudinal platform, longitudinal guide rails, and jacking modules; a plurality of longitudinal platforms are distributed in the middle of the bottom frame of the overall support mechanism and are respectively slidably connected to the corresponding lateral guide rails through the lateral sliders. Each longitudinal platform is equipped with longitudinal guide rails, and a plurality of jacking modules are distributed on the longitudinal guide rails; the jacking module includes a push rod fixing seat, a forming push rod, a steering ball head, a magnetic steering head, and a longitudinal slider. The push rod fixing seat is slidably connected to the longitudinal guide rail through the longitudinal slider. The fixed end of the forming push rod is fixedly connected to the push rod fixing seat, and the telescopic end is equipped with a magnetic steering head through the steering ball head.

[0008] Furthermore, the jacking mechanism further includes a position adjustment module; the position adjustment module includes a gear motor, a motor fixing plate, a gear, and a rack. The motor fixing plate is fixedly connected to the longitudinal platform. The gear motor is located on the motor fixing plate. A gear is installed on the output shaft of the gear motor, and the gear meshes with the rack located on the lateral platform.

[0009] Furthermore, the flipping mechanism includes a first cross beam, flipping side plates, a hydraulic cylinder, base side plates, and a second cross beam; the lower end of the flipping side plate is rotatably connected to the upper end of the base side plate. One end of the first cross beam is fixedly connected to the upper end of the flipping side plate and penetrates through the bottom frame of the upper forming die surface structure and is fixedly connected to the bottom frame; one end of the second cross beam is fixedly connected to the lower end of the base side plate and penetrates through the bottom frame of the lower forming die surface structure and is fixedly connected to the bottom frame; the fixed end of the hydraulic cylinder is rotatably connected to the middle position of the lower part of the base side plate, and the telescopic end is rotatably connected to the middle position of the upper part of the flipping side plate.

[0010] Furthermore, the overall support mechanism includes a bottom frame, a lateral platform, and support modules; a plurality of lateral platforms are arrayed on the top of the bottom frame, and each lateral platform is connected to a plurality of support modules; the support module includes a lower fixing plate and a platform push rod. The lower fixing plate is connected to the lower end of the bottom frame. The fixed end of the platform push rod is fixedly connected to the lower fixing plate, and the telescopic end of the platform push rod is fixedly connected to the lateral platform.

[0011] Furthermore, the support module further includes an upper fixing plate, a guide sleeve, and a guide shaft; the upper fixing plate is connected to the upper end of the bottom frame. Two guide shafts are symmetrically arranged on both sides of the platform push rod and are fixedly connected to the lateral platform. The guide shaft is slidably connected to the upper fixing plate through the guide sleeve.

[0012] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0013] 1. The mold can adjust the forming surface adapted to the blade profile by controlling the lifting of the horizontal platform, the lifting and movement of the support modules of the edge support mechanism, and the lifting and movement of the jacking module, and then produce blades of corresponding models. It can be used for the forming of fan blades of various different models, greatly improving the universality of the mold and saving the design and manufacturing costs of the female mold for blades.

[0014] 2. A longitudinal platform is added to the jacking mechanism, enabling the forming push rod to also move longitudinally. When two adjacent jacking modules in the longitudinal direction run to the flush position, the longitudinal platform can be spliced longitudinally, greatly increasing the movable range of the forming push rod, enabling more flexible and accurate adjustment of the position of the jacking point, and realizing the deformation of the multi-point flexible die surface.

[0015] 3. The flexible die surface is composed of a metal layer and a composite material layer. The metal layer includes a wire mesh and a metal electric heating wire, and the composite material layer is made of a silicone rubber composite material. The wire mesh in the metal layer enables the flexible die surface to adhere to the upper end of the edge support mechanism. The silicone rubber composite material has high flexibility, enabling the elastic deformation of the flexible die surface to be adjustable under minor deformations. The effective combination of the metal layer and the composite material layer is conducive to the realization of the working plane at the top of the edge support mechanism, and the formed working plane helps with the layout of the required mechanisms, circuits, etc. during work.

[0016] 4. The bottom frame is built with aluminum profiles. Aluminum profiles have the advantages of low density, high strength, easy splicing, and light weight. While meeting the modular splicing function and flexible adjustment function of the flexible mold, it ensures the stability of the structure of the flexible mold, reduces the weight of the overall structure, and is conducive to the flipping and clamping of the mold. The flipping mechanism is applicable to the aluminum profile frame, and the cross beam can be inserted and fixed in the bottom frame, ensuring the overall stability during the flipping process and the safety of the work. In addition, the cross beam greatly improves the overall rigidity during the flipping process, effectively ensuring the stability during the overall flipping. Description of the Drawings

[0017] Figure 1 is the overall structure schematic diagram;

[0018] Figure 2 is the structure schematic diagram with the flexible die surface removed;

[0019] Figure 3 is the structure schematic diagram of the overall support mechanism;

[0020] Figure 4 is the structure schematic diagram of the edge support mechanism;

[0021] Figure 5 is the structure schematic diagram of the flexible die surface;

[0022] Figure 6It is a schematic structural diagram of the lifting mechanism;

[0023] Figure 7 It is a schematic structural diagram of the flipping mechanism;

[0024] Legend: 1 - Overall support mechanism, 101 - Bottom frame, 102 - Lower fixing plate, 103 - Upper fixing plate, 104 - Horizontal platform, 105 - Guide sleeve, 106 - Platform push rod, 107 - Guide shaft fixing seat, 108 - First lifting connection seat, 109 - Guide shaft;

[0025] 2 - Edge support mechanism, 201 - Lower frame, 202 - Upper frame, 203 - Magnetic strip, 204 - Magnetic connection head, 205 - Second lifting connection seat, 206 - Edge push rod, 207 - Wheel frame, 208 - Hub motor, 209 - Roller, 210 - Edge slider; 211 - Horizontal guide rail;

[0026] 3 - Flexible die surface, 301 - Upper composite layer, 302 - Metal layer, 303 - Lower composite layer;

[0027] 4 - Lifting mechanism, 401 - Horizontal slider, 402 - Longitudinal platform, 403 - Longitudinal guide rail, 404 - Push rod fixing seat, 405 - Connecting column, 406 - Linear motor, 407 - Guide rod, 408 - Guide sleeve, 409 - Horizontal hoop, 410 - Forming push rod, 411 - Steering ball head, 412 - Magnetic steering head, 413 - Gear motor, 414 - Motor fixing plate, 415 - Longitudinal slider, 416 - Gear, 417 - Rack, 418 - Extension shaft;

[0028] 5 - Flipping mechanism, 501 - First cross beam, 502 - First cross beam reinforcement plate, 503 - Cross beam fixing seat, 504 - Flipping side plate, 505 - Hydraulic cylinder, 506 - Base side plate, 507 - Second cross beam reinforcement plate, 508 - Second cross beam. Detailed implementation manners

[0029] The following provides specific embodiments in conjunction with the accompanying drawings. The specific embodiments are only used to introduce the technical solutions of the present invention in detail and do not limit the protection scope of this application.

[0030] The present invention provides a flexible forming mold for wind turbine blades (abbreviated as mold, see Figures 1 to 7) including an upper forming die surface structure, a lower forming die surface structure, and a flipping mechanism 5; the flipping mechanism 5 is respectively connected to the upper forming die surface structure and the lower forming die surface structure to realize the flipping of the upper forming die surface structure, and further realize the opening and closing of the die. Both the upper forming die surface structure and the lower forming die surface structure include an overall support mechanism 1, an edge support mechanism 2, a flexible die surface 3, and a lifting mechanism 4. A plurality of edge support mechanisms 2 are respectively arrayed on both sides of the overall support mechanism 1, and a plurality of lifting mechanisms 4 are arrayed in the middle of the overall support mechanism 1. Both sides of the flexible die surface 3 are fixedly connected to the edge support mechanisms 2 on both sides respectively, and the main body part of the flexible die surface 3 covers all the lifting mechanisms 4; the overall support mechanism 1 provides overall support for the forming die surface structure, the edge support mechanism 2 provides support for the edge of the flexible die surface 3, and the lifting mechanism 4 is used for the forming of the flexible die surface 3.

[0031] As Figure 3 shown, the overall support mechanism 1 includes a bottom frame 101, a transverse platform 104, and a support module. A plurality of transverse platforms 104 are longitudinally arrayed on the top of the bottom frame 101, and each transverse platform 104 is connected to a plurality of support modules. The support module includes a lower fixing plate 102, a platform push rod 106, and a first lifting connection seat 108. The lower fixing plate 102 is fixed at the lower end of the bottom frame 101. The fixed end of the platform push rod 106 is fixedly connected to the lower fixing plate 102, and the telescopic end of the platform push rod 106 is fixedly connected to the transverse platform 104 through the first lifting connection seat 108. The lifting of the transverse platform 104 is realized through the platform push rod 106 to adjust the overall height of the forming die surface structure.

[0032] The support module further includes an upper fixing plate 103, a guide sleeve 105, a guide shaft fixing seat 107, and a guide shaft 109; the upper fixing plate 103 is fixedly connected to the upper end of the bottom frame 101. Two guide shafts 109 are symmetrically arranged on both sides of the platform push rod 106 and are respectively fixedly connected to the transverse platform 104 through the guide shaft fixing seats 107. At the same time, the guide shaft 109 is slidably connected to the upper fixing plate 103 through the guide sleeve 105. As the transverse platform 104 rises and falls, the guide shaft 109 can reciprocally slide relative to the upper fixing plate 103, playing a guiding and limiting role in the movement of the platform push rod 106.

[0033] As Figure 4As shown in the figure, the edge support mechanism 2 includes a transverse guide rail 211 and a support module; a transverse guide rail 211 is installed on each transverse platform 104, and a support module is installed on both sides of each end of the transverse guide rail 211, and the position of the support module on the transverse guide rail 211 is adjustable. The support module includes a lower frame body 201, an upper frame body 202, a magnetic strip 203, a magnetic connection head 204, a second lifting connection seat 205, an edge push rod 206, a wheel frame 207, a hub motor 208, a roller 209, and an edge slider 210; wherein, the lower frame body 201 is slidably connected to the transverse guide rail 211 through the edge slider 210, and a plurality of rollers 209 are installed at the bottom of the lower frame body 201 through the wheel frame 207. The rollers 209 are simultaneously embedded in the groove in the middle of the transverse guide rail 211, and each roller 209 is connected to a hub motor 208. The hub motor 208 drives the roller 209 to rotate, so that the lower frame body 201 slides on the transverse guide rail 211, thereby adjusting the position of the support module on the transverse platform 104 to adapt to the sizes of different products to be formed; the upper frame body 202 is inserted into the lower frame body 201, the fixed end of the edge push rod 206 is fixedly connected to the lower frame body 201, and the telescopic end is fixedly connected to the upper frame body 202 through the second lifting connection seat 205, and the lifting of the upper frame body 202 is realized through the edge push rod 206; the magnetic strip 203 is located at the top of the upper frame body 202, the magnetic connection head 204 is installed on one side of the top end of the upper frame body 202, and the magnetic strip 203 and the magnetic connection head 204 are magnetized to adsorb the flexible die surface 3, realizing the fixed connection between the flexible die surface 3 and the edge adjustable mechanism 2, so that the flexible die surface 3 forms a working plane at the top end of the upper frame body 202.

[0034] As Figure 5 shown, the flexible die surface 3 includes a composite material upper layer 301, a metal layer 302, and a composite material lower layer 303, and the metal layer 302 is located between the composite material upper layer 301 and the composite material lower layer 303. A wire mesh and a metal electric heating wire are provided in the metal layer 302, and the metal layer 302 enables the flexible die surface 3 to be attached to the upper end of the edge adjustable mechanism 2, realizing the fixation of both sides of the flexible die surface 3. Both the composite material upper layer 301 and the composite material lower layer 303 are made of silicone rubber composite materials. The silicone rubber composite materials have high flexibility, enabling the elastic deformation of the flexible die surface 3 under small deformations to be adjustable, which is beneficial to forming a working plane at the top end of the edge adjustable mechanism 2.

[0035] As Figure 6As shown in the figure, the jacking mechanism 4 includes a transverse slider 401, a longitudinal platform 402, a longitudinal guide rail 403, a jacking module, and a position adjustment module; a plurality of longitudinal platforms 402 are distributed in the middle of the bottom frame 101 and are respectively slidably connected to the respective transverse guide rails 211 through the transverse sliders 401. Each longitudinal platform 402 is connected with a plurality of position adjustment modules for adjusting the transverse position of the longitudinal platform 402; a longitudinal guide rail 403 is installed on each longitudinal platform 402, and a plurality of jacking modules are distributed on the longitudinal guide rail 403.

[0036] The jacking module includes a push rod fixing seat 404, a linear motor 406, a formed push rod 410, a steering ball head 411, a magnetic steering head 412, and a longitudinal slider 415; the push rod fixing seat 404 is slidably connected to the longitudinal guide rail 403 through the longitudinal slider 415, the linear motor 406 is connected to the push rod fixing seat 404 to drive the push rod fixing seat 404 to slide; the fixed end of the formed push rod 410 is fixedly connected to the push rod fixing seat 404, and the telescopic end of the formed push rod 410 is provided with a magnetic steering head 412 through the steering ball head 411; the transverse position of the magnetic steering head 412 is adjusted by the sliding connection between the transverse slider 401 and the transverse guide rail 211, the longitudinal position of the magnetic steering head 412 is adjusted by the sliding connection between the longitudinal slider 415 and the longitudinal guide rail 403, and the height of the magnetic steering head 412 is adjusted by the telescopic movement of the formed push rod 410, so that the magnetic steering head 412 contacts the flexible die surface 3 at a set position.

[0037] The jacking module further includes a guide rod 407, a guide sleeve 408, and an extension shaft 418; the guide sleeve 408 is fixedly installed on the push rod fixing seat 404, both sides of the guide sleeve 408 are provided with chutes, and a transverse hoop 409 for reinforcement is provided in the middle of the guide sleeve 408; extension shafts 418 are symmetrically provided on both upper sides of the telescopic end of the formed push rod 410, the end of the extension shaft 418 is connected with a guide rod 407, the end of the guide rod 407 passes through the top of the guide sleeve 408 and is matched with the chute of the guide sleeve 408 through a connecting column 405. The guide rod 407 moves together with the telescopic movement of the formed push rod 410, and the guide rod 407 plays a guiding role in the telescopic movement of the formed push rod 410.

[0038] The position adjustment module includes a gear motor 413, a motor fixing plate 414, a gear 416, and a rack 417; the motor fixing plate 414 is fixedly connected to the longitudinal platform 402, the gear motor 413 is installed on the motor fixing plate 414, a gear 416 is installed on the output shaft of the gear motor 413, and the gear 416 meshes with the rack 417 located on the transverse platform 104; the longitudinal platform 402 is driven to slide on the transverse guide rail 211 through the gear motor 413 to adjust the transverse position of the longitudinal platform 402, and further adjust the position of the jacking module.

[0039] As Figure 7As shown, the flipping mechanism 5 includes a first cross beam 501, flipping side plates 504, a hydraulic cylinder 505, base side plates 506, and a second cross beam 508; the lower end of the flipping side plate 504 is rotatably connected to the upper end of the base side plate 506, one end of the first cross beam 501 is fixedly connected to the upper end of the flipping side plate 504 through a cross beam fixing seat 503, a first cross beam reinforcing plate 502 is provided between the first cross beam 501 and the cross beam fixing seat 503, and the first cross beam 501 penetrates through the bottom frame of the upper forming die surface structure and is fixedly connected to the bottom frame; one end of the second cross beam 508 is fixedly connected to the lower end of the base side plate 506, a second cross beam reinforcing plate 507 is provided between the second cross beam 508 and the base side plate 506, and the second cross beam 508 penetrates through the bottom frame of the lower forming die surface structure and is fixedly connected to the bottom frame; the fixed end of the hydraulic cylinder 505 is rotatably connected to the middle position of the lower part of the base side plate 506, and the telescopic end is rotatably connected to the middle position of the upper part of the flipping side plate 504. By driving the flipping side plate 504 to rotate around the base side plate 506 through the hydraulic cylinder 505, the flipping of the upper forming die surface is realized, and thus the opening and closing of the die are realized.

[0040] The working principle and working process of the present utility model are as follows:

[0041] Taking the separation of the upper and lower forming die surface structures as the initial state. First, the hub motors 208 of each support module drive their respective rollers 209 to rotate to adjust the position of the support module on the transverse platform 104, so that the distance between the support modules at both ends of the transverse platform 104 matches the size of the flexible die surface 3. The lifting of the upper frame 202 is realized through the edge push rod 206, and then the height of the upper frame 202 is adjusted. At the same time, both sides of the flexible die surface 3 are respectively in contact with the magnetic attraction strips 203 and magnetic connection heads 204 of the corresponding support modules, and the magnetic attraction strips 203 and magnetic connection heads 204 are magnetized to adsorb the flexible die surface 3. Then, the platform push rods 106 of each support module work to push the corresponding transverse platform 104 to lift, and then adjust the flexible die surface 3 to a suitable height. The lateral position of the longitudinal platform 402 is adjusted through the position adjustment module of the jacking mechanism, and the position of the forming push rod 410 on the longitudinal guide rail 403 is adjusted through the linear motor 406, and then the lateral and longitudinal positions of the magnetic steering head 412 are adjusted; the lifting of the magnetic steering head 412 is realized through the forming push rod 410 to make it in position contact with the flexible die surface 3. Finally, the hydraulic cylinder 505 drives the flipping side plate 504 to rotate around the base side plate 506, so that the flexible die surface of the upper forming die surface structure covers the flexible die surface of the lower forming die surface structure to realize die closing; when the hydraulic cylinder 505 drives the flipping side plate 504 to rotate in the reverse direction around the base side plate 506, die opening is realized.

[0042] The parts not described in the present utility model are applicable to the prior art.

Claims

1. A flexible forming mold for a wind turbine blade, characterized in that: It includes an upper molding die surface structure, a lower molding die surface structure and a flip mechanism; the upper molding die surface structure and the lower molding die surface structure both include an overall support mechanism, an edge support mechanism, a flexible die surface and a lifting mechanism, a plurality of edge support mechanisms are arrayed on both sides of the overall support mechanism, a plurality of lifting mechanisms are arrayed in the middle of the overall support mechanism, and the flexible die surface is connected to all edge support mechanisms and lifting mechanisms; The edge support mechanism includes a transverse guide rail and a support module; a transverse guide rail is installed on each transverse platform of the overall support mechanism, and a support module is installed at each end of the transverse guide rail; the support module includes a lower frame, an upper frame, an edge push rod, a hub motor, a roller and an edge slider, the lower frame is slidably connected to the transverse guide rail through the edge slider, and a plurality of rollers cooperating with the transverse guide rail are installed at the bottom of the lower frame, and each roller is connected to a hub motor; a magnetic strip is provided on the top of the upper frame, and the lower part is slidably connected to the lower frame.

2. The wind turbine blade flexible forming mold according to claim 1, characterized in that: The jacking mechanism includes a transverse slider, a longitudinal platform, a longitudinal guide rail and a jacking module; multiple longitudinal platforms are distributed in the middle of the bottom frame of the overall support mechanism and are slidably connected to the corresponding transverse guide rails through the transverse sliders, each longitudinal platform is installed with a longitudinal guide rail, and multiple jacking modules are distributed on the longitudinal guide rails; the jacking module includes a push rod fixing seat, a formed push rod, a steering ball head, a magnetic steering head and a longitudinal slider, the push rod fixing seat is slidably connected to the longitudinal guide rail through the longitudinal slider, the fixed end of the formed push rod is fixedly connected to the push rod fixing seat, and the telescopic end is installed with a magnetic steering head through the steering ball head.

3. The wind turbine blade flexible forming mold according to claim 2, characterized in that: The lifting mechanism also includes a position adjustment module; the position adjustment module includes a gear motor, a motor fixing plate, a gear and a rack, the motor fixing plate is fixedly connected to the longitudinal platform, the gear motor is located on the motor fixing plate, a gear is installed on the output shaft of the gear motor, and the gear is meshed with the rack located on the transverse platform.

4. The wind turbine blade flexible forming mold according to claim 1, characterized in that: The flipping mechanism includes a first crossbeam, a flip side plate, a hydraulic cylinder, a base side plate and a second crossbeam; the lower end of the flip side plate is rotatably connected to the upper end of the base side plate, one end of the first crossbeam is fixedly connected to the upper end of the flip side plate, and the first crossbeam passes through the bottom frame of the upper forming die surface structure and is fixedly connected to the bottom frame; one end of the second crossbeam is fixedly connected to the lower end of the base side plate, the second crossbeam passes through the bottom frame of the lower forming die surface structure and is fixedly connected to the bottom frame; the fixed end of the hydraulic cylinder is rotatably connected to the middle position of the lower part of the base side plate, and the telescopic end is rotatably connected to the middle position of the upper part of the flip side plate.

5. The wind turbine blade flexible forming mold according to claim 1 or 4, characterized in that: The overall support mechanism includes a bottom frame, a transverse platform and a support module; the top array of the bottom frame has multiple transverse platforms, each transverse platform is connected to multiple support modules; the support module includes a lower fixed plate and a platform push rod, the lower fixed plate is connected to the lower end of the bottom frame, the fixed end of the platform push rod is fixedly connected to the lower fixed plate, and the telescopic end of the platform push rod is fixedly connected to the transverse platform.

6. The wind turbine blade flexible forming mold according to claim 5, characterized in that: The support module also includes an upper fixed plate, a guide sleeve and a guide shaft; the upper fixed plate is connected to the upper end of the bottom frame, two guide shafts are symmetrically arranged on both sides of the platform push rod and fixedly connected to the transverse platform, and the guide shaft is slidably connected to the upper fixed plate through the guide sleeve.

Images